CN112873930B - Stainless steel seamless steel pipe and processing technology thereof - Google Patents
Stainless steel seamless steel pipe and processing technology thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
- B05D3/0245—Pretreatment, e.g. heating the substrate with induction heating
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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Abstract
The application relates to the field of steel pipe machining and discloses a stainless steel seamless steel pipe and a machining process thereof. The processing technology comprises the following steps: removing water; shot blasting treatment; plastic coating treatment is carried out on the steel pipe by adopting a plastic coating agent; coating an adhesive layer; coating a polyethylene plastic layer; curing treatment; the application has the following advantages and effects: the plastic coating agent is coated on the steel pipe, so that external corrosive substances are prevented from entering the steel pipe, and the steel pipe has the function of inhibiting corrosion; and the processing technology has the advantages that the steel pipe is preheated to melt the plastic coating agent, so that the plastic coating agent is more uniformly coated on the steel pipe, the adhesive is continuously coated and a polyethylene plastic layer is coated, and the stainless steel seamless steel pipe with longer durability and corrosion resistance is obtained through compaction and cooling.
Description
Technical Field
The application relates to the field of steel pipe machining, in particular to a stainless steel seamless steel pipe and a machining process thereof.
Background
When a steel pipe is used for transmitting media or placed in natural environments such as atmosphere and soil, the pipe wall can be corroded to different degrees, the service life of the pipe is finally prolonged, and the media in some pipes are not allowed to be polluted due to pipe wall corrosion, so that methods for protecting the pipe wall are formed, and a plurality of traditional protective measures are adopted, and usually a coating is applied to the inner wall or the outer wall of the steel pipe; the coating is of various types, including rubber, galvanized coating, cement mortar, etc.
At present, a patent with publication number CN102383081A discloses a multi-element alloy for hot galvanizing of steel pipes and a production method thereof; the components and weight ratio are as follows: al: 35% -45%, Ni: 0.3 to 0.8 percent of Zn, and the balance of Zn; the production method comprises the following steps: zinc, aluminum and nickel were mixed as follows: 35% -45%, Ni: 0.3 to 0.8 percent, and the balance of Zn, and adding the mixture into a melting furnace with the temperature of 650 plus one year and 750 ℃ for melting and complete fusion, and casting the mixture into the zinc-aluminum-nickel alloy.
The above prior art solutions have the following drawbacks: although the zinc coating can form a combination on the surface of the steel pipe and has certain corrosion resistance, zinc is a metal, the activity of the zinc is better than that of iron, the zinc preferentially participates in chemical reaction, and a medium firstly erodes the zinc layer and then erodes the iron layer until the pipe wall is perforated, so the current method for protecting the pipe wall of the steel pipe still needs to be improved.
Disclosure of Invention
In order to improve the erosion resistance of the wall of the steel pipe and prolong the service life of the steel pipe, the application provides a stainless steel seamless steel pipe and a processing technology thereof.
In a first aspect, the application provides a process for processing a stainless steel seamless steel tube, which adopts the following technical scheme:
a processing technology of a stainless steel seamless steel pipe comprises the following steps:
S1, removing moisture; conveying the steel pipe to an annular electric induction preheating furnace, heating to 30-50 ℃, and removing water;
s2, shot blasting treatment; the steel pipe after moisture removal enters a shot blasting chamber, and shot blasting treatment is carried out on the outer surface of the steel pipe to meet the requirement of Swedish standard SIS055900Sa 21/2;
s3, plastic coating treatment of the steel pipe; preparing a plastic coating agent, preheating a steel pipe to the temperature of (150 +/-10), coating the plastic coating agent on the outer surface of the steel pipe, wherein the coating thickness is 80-100 mu m, and melting the plastic coating agent at the temperature of (150 +/-10) ℃ to form a plastic coating layer;
s4, coating the adhesive layer; the adhesive is extruded by an extrusion die and coated on the plastic-coated layer to form an adhesive layer with the thickness of 0.2-0.3 mm;
s5, covering a polyethylene plastic layer; extruding the polyethylene plastic by an extrusion die, and coating the polyethylene plastic on the adhesive to form a polyethylene plastic layer;
s6, curing; and compacting the plastic coating layer, the adhesive layer and the polyethylene plastic layer on the steel pipe by a compression roller, and solidifying the coating by water spray cooling.
By adopting the technical scheme, the plastic coating agent is melted by preheating the steel pipe, so that the plastic coating agent is more uniformly coated on the steel pipe, the adhesive is continuously coated and a polyethylene plastic layer is coated, and the stainless steel seamless steel pipe with longer durability and corrosion resistance is obtained by compacting and cooling.
Preferably: the plastic coating agent comprises the following raw materials in parts by weight:
50-60 parts of polymethyl methacrylate;
10-15 parts of propynyl glycidyl ether;
4-6 parts of benzohydroxamic acid;
2-3 parts of ceramic micro powder;
15-18 parts of styrene-acrylic emulsion;
1-2 parts of antioxidant.
By adopting the technical scheme, the high molecular compound polymethyl methacrylate is coated on the steel pipe to form the steel-plastic composite pipe, so that the original mechanical properties such as strength and rigidity of the steel pipe are retained, and the comprehensive properties such as chemical stability, weather resistance and the like of the polymethyl methacrylate are combined, so that the steel pipe with more durable corrosion resistance is obtained; the styrene-acrylic emulsion and the ceramic micro powder are mixed and added into the plastic coating agent which takes polymethyl methacrylate as a main component, so that on one hand, the dispersion of the ceramic micro powder is promoted, and on the other hand, all components of the plastic coating agent are fully contacted and can be stirred to be uniform, thereby improving the overall performance of the plastic coating agent; the antioxidant improves the oxidation resistance of the plastic coating agent and assists in improving the corrosion resistance; the propynyl glycidyl ether is mixed with the benzohydroxamic acid and then is further blended with the polymethyl methacrylate to obtain a high molecular compound containing an epoxy chain segment, and a compact network structure can be formed, so that the porosity is reduced, external corrosive substances are prevented from invading, and the corrosion is inhibited, therefore, the corrosion resistance of the stainless steel seamless steel pipe is better.
Preferably, the following components: the raw materials also comprise 1-2 parts of N-benzyl maleimide by weight.
By adopting the technical scheme, the N-benzyl maleimide contains a maleimide component, and the side group connected to the carbon chain contains a ring structure and has a large volume, so that the corrosion resistance of the coating agent is improved to a certain extent by inhibiting the corrosion of the components.
Preferably, the following components: the raw material also comprises 0.2 to 0.3 portion of p-nitroaniline according to the weight portion.
By adopting the technical scheme, the corrosion resistance of the obtained plastic coating agent is improved after the N-benzyl maleimide treated by the paranitroaniline is mixed with the polymethyl methacrylate.
Preferably: the raw materials also comprise 3-4 parts of 3-chloro-pyrazine-2, 6-diamine and 0.8-1 part of platinum sulfite by weight.
By adopting the technical scheme, 3-chloro-pyrazine-2, 6-diamine is used as a bridging ligand and reacts with platinum sulfite to synthesize a coordination compound with platinum, and the addition of the coordination compound and the mixing of the coordination compound and the other components of the plastic coating agent are beneficial to forming a plastic coating agent with compact structure, so that the stability and the corrosion resistance of the plastic coating agent are improved, and the protective performance of the steel pipe is improved.
Preferably: the raw materials also comprise 0.6 to 0.8 weight portion of sodium citrate.
By adopting the technical scheme, experiments prove that sodium citrate is further added in the reaction of the 3-chloro-pyrazine-2, 6-diamine and the platinum sulfite, which is helpful for improving the lasting corrosion resistance of the plastic coating agent, and probably the reason is that the addition of the sodium citrate promotes the full reaction of the 3-chloro-pyrazine-2, 6-diamine and the platinum sulfite to obtain a coordination compound with better performance, so that the aim of improving the overall performance of the plastic coating agent is fulfilled, and the stainless steel seamless steel pipe with lasting corrosion resistance is obtained.
Preferably: the antioxidant is antioxidant 1010.
In a second aspect, the present application provides a stainless steel seamless steel tube prepared by the aforementioned process.
In summary, the present application has the following beneficial effects:
1. the processing technology of the application utilizes the preheating of the steel pipe to melt the plastic coating agent, so that the plastic coating agent is more uniformly coated on the steel pipe, the adhesive is continuously coated and a polyethylene plastic layer is coated, and the stainless steel seamless steel pipe with more lasting corrosion resistance is obtained through compaction and cooling;
2. in the application, the high molecular compound polymethyl methacrylate is preferably coated on the steel pipe to form the steel-plastic composite pipe; propynyl glycidyl ether is mixed with benzohydroxamic acid and then is further mixed with polymethyl methacrylate to obtain a high molecular compound containing an epoxy chain segment, and a compact network structure can be formed, so that the porosity is reduced, external corrosive substances are prevented from invading, the corrosion inhibition effect is achieved, and the corrosion resistance of the stainless steel seamless steel pipe is improved;
3. According to the application, N-benzyl maleimide containing maleimide components is adopted, the side group connected to a carbon chain contains a ring structure and has a large volume, the corrosion of components is inhibited to a certain extent, and p-nitroaniline is further used for treating the N-benzyl maleimide, so that the corrosion resistance of the plastic coating agent is improved, and the purpose of improving the corrosion resistance of the stainless steel seamless steel tube is achieved;
4. 3-chloro-pyrazine-2, 6-diamine is used as a bridging ligand, and reacts with platinum sulfite to synthesize a coordination compound with platinum under the action of sodium citrate, and the coordination compound is added and mixed with the rest components of the plastic coating agent, so that the plastic coating agent with compact structure is formed, the stability and the corrosion resistance of the plastic coating agent are improved, and the protective performance of the steel pipe is improved.
Drawings
Fig. 1 is a schematic cross-sectional structural view of a stainless steel seamless steel pipe provided by the present application.
Description of reference numerals: 1. a steel pipe; 2. coating a plastic layer; 3. an adhesive layer; 4. a polyethylene plastic layer.
Detailed Description
The present application will be described in further detail with reference to fig. 1 and the examples.
In the present application, polymethyl methacrylate is available from Hubei Pont technologies, Inc.; propinyl glycidyl ether is available from Shanghai Yoddy chemical science and technology Co., Ltd; benzomethoxam is purchased from Yueyang Anda chemical company, Ltd; the ceramic micro powder is purchased from Henan Jade mill New materials Co., Ltd; styrene-acrylic emulsion was purchased from Kyowa chemical Co., Ltd, Guangzhou; n-benzyl maleimide available from Haemain Biotech, Suzhou; 3-chloro-pyrazine-2, 6-diamine available from Shanghai Bidi pharmaceutical science and technology Co., Ltd; platinum sulfite was purchased from Tianmen Henchang chemical Co., Ltd; the adhesive is carboxymethyl cellulose produced by Hebei space chemical engineering Co.
The raw materials used in the following embodiments may be those conventionally commercially available unless otherwise specified; those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer.
Examples
Example 1
The application discloses stainless steel seamless steel pipe and processing technology thereof, and referring to fig. 1, the processing technology of the stainless steel seamless steel pipe comprises the following steps:
s1, removing moisture; conveying the steel pipe 1 to an annular electric induction preheating furnace, heating to 30 ℃, and removing water;
s2, shot blasting treatment; the steel pipe 1 after the moisture is removed enters a shot blasting chamber, and shot blasting treatment is carried out on the outer surface, so that the requirement of Swedish standard SIS 055900Sa21/2 is met;
s3, plastic coating treatment of the steel pipe 1; preparing a plastic coating agent, preheating the steel pipe 1 to 140 ℃, coating the plastic coating agent on the outer surface of the steel pipe 1, wherein the coating thickness is 80 mu m, and melting the plastic coating agent at 140 ℃ to form a plastic coating layer 2;
s4, coating the adhesive layer 3; the adhesive is extruded by an extrusion die and coated on the plastic-coated layer 2 to form an adhesive layer 3 with the thickness of 0.2 mm;
s5, covering a polyethylene plastic layer 4; the polyethylene plastic is extruded by an extrusion die and coated on the adhesive to form a polyethylene plastic layer 4;
s6, curing; the plastic coating layer 2, the adhesive layer 3 and the polyethylene plastic layer 4 on the steel pipe 1 are compacted by a compression roller and then are cooled by water spraying to solidify the coating.
The raw materials of the plastic coating agent comprise polymethyl methacrylate, propynyl glycidyl ether, benzohydroxamic acid, ceramic micro powder, styrene-acrylic emulsion, an antioxidant, N-benzyl maleimide, p-nitroaniline, 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate; wherein the antioxidant is antioxidant 1010.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; then adding a mixture obtained by stirring the N-benzylmaleimide and the p-nitroaniline for 10min, and continuing stirring for 5 min; adding a coordination compound obtained by stirring 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate at 40 ℃ for 20min, and stirring for 18 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 40min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 2
The application discloses stainless steel seamless steel pipe and processing technology thereof, and referring to fig. 1, the processing technology of the stainless steel seamless steel pipe comprises the following steps:
s1, removing moisture; conveying the steel pipe 1 to an annular electric induction preheating furnace, heating to 50 ℃, and removing water;
S2, shot blasting treatment; the steel pipe 1 after the moisture is removed enters a shot blasting chamber, and shot blasting treatment is carried out on the outer surface, so that the requirement of Swedish standard SIS 055900Sa21/2 is met;
s3, plastic coating treatment of the steel pipe 1; preparing a plastic coating agent, preheating the steel pipe 1 to 160 ℃, coating the plastic coating agent on the outer surface of the steel pipe 1, wherein the coating thickness is 100 mu m, and melting the plastic coating agent at 160 ℃ to form a plastic coating layer 2;
s4, coating the adhesive layer 3; the adhesive is extruded out by an extrusion die and is coated on the plastic-coated layer 2 to form an adhesive layer 3 with the thickness of 0.3 mm;
s5, covering a polyethylene plastic layer 4; the polyethylene plastic is extruded by an extrusion die and is coated on the adhesive to form a polyethylene plastic layer 4;
s6, curing; the plastic coating layer 2, the adhesive layer 3 and the polyethylene plastic layer 4 on the steel pipe 1 are compacted by a compression roller and then are cooled by water spraying to solidify the coating.
The raw materials of the plastic coating agent comprise polymethyl methacrylate, propynyl glycidyl ether, benzohydroxamic acid, ceramic micro powder, styrene-acrylic emulsion, an antioxidant, N-benzyl maleimide, p-nitroaniline, 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate; wherein the antioxidant is antioxidant 1010.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 30min, then adding polymethyl methacrylate, heating to 40 ℃, and stirring for 40 min; then adding a mixture obtained by stirring the N-benzylmaleimide and the p-nitroaniline for 15min, and continuing stirring for 8 min; adding a coordination compound obtained by stirring 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate at 50 ℃ for 30min, and stirring for 20 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 50min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 3
The application discloses stainless steel seamless steel pipe and processing technology thereof, and referring to fig. 1, the processing technology of the stainless steel seamless steel pipe comprises the following steps:
s1, removing moisture; conveying the steel pipe 1 to an annular electric induction preheating furnace, heating to 40 ℃, and removing water;
s2, shot blasting treatment; the steel pipe 1 after the moisture is removed enters a shot blasting chamber, and shot blasting treatment is carried out on the outer surface, so that the requirement of Swedish standard SIS 055900Sa21/2 is met;
s3, plastic coating treatment of the steel pipe 1; preparing a plastic coating agent, preheating the steel pipe 1 to 150 ℃, coating the plastic coating agent on the outer surface of the steel pipe 1, wherein the coating thickness is 90 mu m, and melting the plastic coating agent at 150 ℃ to form a plastic coating layer 2;
s4, coating the adhesive layer 3; the adhesive is extruded by an extrusion die and coated on the plastic-coated layer 2 to form an adhesive layer 3 with the thickness of 0.2 mm;
s5, covering a polyethylene plastic layer 4; the polyethylene plastic is extruded by an extrusion die and coated on the adhesive to form a polyethylene plastic layer 4;
s6, curing; the plastic coating layer 2, the adhesive layer 3 and the polyethylene plastic layer 4 on the steel pipe 1 are compacted by a compression roller and then are cooled by water spraying to solidify the coating.
The raw materials of the plastic coating agent comprise polymethyl methacrylate, propynyl glycidyl ether, benzohydroxamic acid, ceramic micro powder, styrene-acrylic emulsion, an antioxidant, N-benzyl maleimide, p-nitroaniline, 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate; wherein the antioxidant is antioxidant 1010.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 28min, then adding polymethyl methacrylate, heating to 35 ℃, and stirring for 35 min; then adding a mixture obtained by stirring the N-benzylmaleimide and the p-nitroaniline for 12min, and continuing stirring for 7 min; adding a coordination compound obtained by stirring 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate at 45 ℃ for 25min, and stirring for 19 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 45min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 4
The difference from the embodiment 1 is that the raw materials of the plastic coating agent comprise polymethyl methacrylate, propynyl glycidyl ether, benzohydroxamic acid, ceramic micro powder, styrene-acrylic emulsion and antioxidant; wherein the antioxidant is antioxidant 1010.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 40min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 5
The difference from example 4 is that the raw material for the plasticizer also includes N-benzylmaleimide.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; adding N-benzyl maleimide, and stirring for 5 min;
the contents of the components are shown in table 1 below.
Example 6
The difference from example 4 is that the raw materials for the plasticizer also include N-benzylmaleimide and p-nitroaniline.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; then adding a mixture obtained by stirring the N-benzylmaleimide and the p-nitroaniline for 10min, and continuing stirring for 5 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 40min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 7
The difference from example 4 is that the raw materials of the plasticizer further include 3-chloro-pyrazine-2, 6-diamine and platinum sulfite.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; adding a coordination compound obtained by stirring 3-chloro-pyrazine-2, 6-diamine and platinum sulfite at 40 ℃ for 20min, and stirring for 18 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 40min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 8
The difference from example 4 is that the raw materials of the plasticizer further include 3-chloro-pyrazine-2, 6-diamine, platinum sulfite, and sodium citrate.
The preparation method of the plastic coating agent comprises the following steps: firstly, mixing and stirring propynyl glycidyl ether and benzohydroxamic acid for 25min, then adding polymethyl methacrylate, heating to 30 ℃, and stirring for 30 min; adding a coordination compound obtained by stirring 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate at 40 ℃ for 20min, and stirring for 18 min; and finally, adding the ceramic micro powder, the styrene-acrylic emulsion and the antioxidant, and stirring for 40min to obtain the plastic coating agent.
The contents of the components are shown in table 1 below.
Example 9
The difference from example 4 is that propynyl glycidyl ether was replaced with glycerol ether, and the contents of the respective components are shown in table 2 below.
Example 10
The difference from example 4 is that benzohydroxamic acid was replaced with phenol, and the contents of each component are shown in table 2 below.
Example 11
The difference from example 6 is that N-benzylmaleimide is replaced by aniline, and the contents of the components are shown in Table 2 below.
Example 12
The difference from example 6 is that, without adding N-benzylmaleimide, the contents of the respective components are shown in Table 2 below.
Example 13
The difference from example 7 is that 3-chloro-pyrazine-2, 6-diamine was replaced with chloroimide and the contents of each component are shown in table 2 below.
Example 14
The difference from example 7 is that platinum sulfite was replaced with acetic acid and the contents of the respective components are shown in table 2 below.
Example 15
The difference from example 4 is that sodium citrate is also added, and the contents of the components are shown in table 2 below.
Comparative example
Comparative example 1
The example of the chinese patent publication CN102383081A was selected as comparative example 1.
Comparative example 2
The difference from example 1 is that only the plastic-coated layer 2 is coated on the steel pipe 1.
Comparative example 3
The difference from example 1 is that the curing step of S6 is eliminated.
TABLE 1 ingredient content tables for examples 1-8
TABLE 2 component content tables for examples 9-15
Performance test samples of steel pipes having an outer diameter of 3cm, an inner diameter of 2cm and a length of 3cm were prepared according to the processes of the examples and comparative examples, and the coating areas included the inner and outer walls of the steel pipe samples.
(1) And (3) corrosion resistance test: representing the corrosion resistance durability of the steel pipe by using the corrosion rate, respectively soaking the steel pipe sample in a 10% sulfuric acid solution, a 10% sodium hydroxide solution and a 3.5% sodium chloride solution at the soaking temperature of 60 ℃ for 2h, taking out the steel pipe sample, testing the weight difference before and after soaking after the steel pipe sample is placed at room temperature for 24h after the surface is wiped dry, and calculating to obtain the corrosion rate, wherein the smaller the corrosion rate is, the better the corrosion resistance is; the test results are shown in table 3 below.
TABLE 3 Corrosion resistance test results table
In summary, the following conclusions can be drawn:
1. according to the embodiment 4 and the embodiments 9-10 and the combination of the table 3, it can be seen that the co-addition of the propinyl glycidyl ether and the benzohydroxamic acid has a synergistic effect on improving the corrosion resistance durability of the plastic coating agent, and is helpful for obtaining the stainless steel seamless steel pipe with better corrosion resistance.
2. According to the embodiment 5 and the embodiments 11-12 and the combination of the table 3, it can be seen that the N-benzylmaleimide and the p-nitroaniline have a synergistic effect, and the corrosion resistance of the plasticizer can be improved after the N-benzylmaleimide and the p-nitroaniline are mixed, so that the corrosion resistance of the stainless steel seamless steel pipe can be improved, and the service life of the stainless steel seamless steel pipe can be prolonged.
3. As can be seen from examples 13 to 14 in combination with Table 3, the corrosion resistance durability of the coating agent can be improved by adding 3-chloro-pyrazine-2, 6-diamine and platinum sulfite together, thereby achieving the purpose of improving the corrosion resistance of the stainless steel seamless steel pipe.
4. It can be seen from examples 7-8 and 15 in combination with Table 3 that there is a synergistic effect between 3-chloro-pyrazine-2, 6-diamine, platinum sulfite and sodium citrate to improve the corrosion resistance of the coating composition.
5. According to the example 1 and the comparative examples 1 to 3 and the combination of the table 3, the stainless steel seamless steel pipe prepared by the processing technology has better corrosion resistance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications to the present embodiment as necessary without inventive contribution after reading the present specification, but all are protected by patent law within the scope of the claims of the present application.
Claims (5)
1. The processing technology of the stainless steel seamless steel pipe is characterized by comprising the following steps:
s1, removing moisture; conveying the steel pipe (1) to an annular electric induction preheating furnace, heating to 30-50 ℃, and removing water;
s2, shot blasting treatment; the steel pipe (1) after moisture removal enters a shot blasting chamber, and shot blasting treatment is carried out on the outer surface to meet the requirement of Swedish standard SIS 055900 Sa 21/2;
s3, plastic coating treatment of the steel pipe (1); preparing a plastic coating agent, preheating the steel pipe (1) to the temperature of (150 +/-10), coating the plastic coating agent on the outer surface of the steel pipe (1) with the coating thickness of 80-100 mu m, and melting the plastic coating agent at the temperature of (150 +/-10) to form a plastic coating layer (2);
s4, coating the adhesive layer (3); the adhesive is extruded by an extrusion die and is coated on the plastic-coated layer (2) to form an adhesive layer (3), and the thickness of the adhesive layer is 0.2-0.3 mm;
s5, covering a polyethylene plastic layer (4); the polyethylene plastic is extruded by an extrusion die and coated on the adhesive to form a polyethylene plastic layer (4);
S6, curing; compacting the plastic coating layer (2), the adhesive layer (3) and the polyethylene plastic layer (4) on the steel pipe (1) by a compression roller, and solidifying the coating by water spray cooling;
the plastic coating agent comprises the following raw materials in parts by weight:
50-60 parts of polymethyl methacrylate;
10-15 parts of propynyl glycidyl ether;
4-6 parts of benzohydroxamic acid;
2-3 parts of ceramic micro powder;
15-18 parts of styrene-acrylic emulsion;
1-2 parts of an antioxidant;
3-4 parts of 3-chloro-pyrazine-2, 6-diamine;
0.8-1 part of platinum sulfite;
0.6-0.8 part of sodium citrate.
2. The process for machining a stainless steel seamless steel pipe according to claim 1, characterized in that: the raw materials also comprise 1-2 parts of N-benzyl maleimide by weight.
3. The process for machining a stainless steel seamless steel pipe according to claim 2, characterized in that: the raw material also comprises 0.2 to 0.3 portion of p-nitroaniline according to the weight portion.
4. The process for machining a stainless steel seamless steel pipe according to claim 1, characterized in that: the antioxidant is antioxidant 1010.
5. A stainless steel seamless steel pipe produced by the process according to any one of claims 1 to 4.
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| US6540843B1 (en) * | 2000-09-12 | 2003-04-01 | Honeywell International Inc. | Method of preparing a catalyst layer over a metallic surface of a recuperator |
| JP2013157289A (en) * | 2012-01-31 | 2013-08-15 | Sumitomo Chemical Co Ltd | Method of manufacturing structure of electrode catalyst, structure of electrode catalyst, membrane electrode/gas diffusion layer assembly, fuel cell and air battery |
| CN110306217A (en) * | 2019-07-08 | 2019-10-08 | 深圳市甘露珠宝首饰有限公司 | Precious metal jewelry and its processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100463260C (en) * | 2005-05-14 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Gas diffusion electrode and mfg. method thereof |
| CN112046045B (en) * | 2020-09-01 | 2022-05-17 | 山东东宏管业股份有限公司 | Steel pipe with three anti-corrosion layers of inner layer and outer layer and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6245453B1 (en) * | 1997-12-18 | 2001-06-12 | Toyota Jidosha Kabushiki Kaisha | Fuel cell and separator for the same |
| US6540843B1 (en) * | 2000-09-12 | 2003-04-01 | Honeywell International Inc. | Method of preparing a catalyst layer over a metallic surface of a recuperator |
| JP2013157289A (en) * | 2012-01-31 | 2013-08-15 | Sumitomo Chemical Co Ltd | Method of manufacturing structure of electrode catalyst, structure of electrode catalyst, membrane electrode/gas diffusion layer assembly, fuel cell and air battery |
| CN110306217A (en) * | 2019-07-08 | 2019-10-08 | 深圳市甘露珠宝首饰有限公司 | Precious metal jewelry and its processing method |
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