CN114700882A - Method for online removing oxide skin on inner surface and outer surface of seamless steel tube - Google Patents
Method for online removing oxide skin on inner surface and outer surface of seamless steel tube Download PDFInfo
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- CN114700882A CN114700882A CN202210355586.8A CN202210355586A CN114700882A CN 114700882 A CN114700882 A CN 114700882A CN 202210355586 A CN202210355586 A CN 202210355586A CN 114700882 A CN114700882 A CN 114700882A
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- seamless steel
- steel pipe
- shot blasting
- seamless
- pressure
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005422 blasting Methods 0.000 claims abstract description 49
- 239000002253 acid Substances 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 14
- 238000009991 scouring Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000005554 pickling Methods 0.000 claims description 17
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 239000002390 adhesive tape Substances 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 21
- 238000004140 cleaning Methods 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a method for removing oxide skins on the inner and outer surfaces of a seamless steel tube on line, which comprises the following steps: A) shot blasting is carried out on the outer surface of the seamless steel pipe, and then high-pressure scouring is carried out; B) shielding and protecting the outer surface of the seamless steel pipe obtained in the step A), and then carrying out acid washing. The method of the invention separately treats the inner surface and the outer surface of the seamless steel pipe to remove the oxide skin, firstly carries out shot blasting treatment on the seamless steel pipe, and then carries out acid cleaning treatment on the inner surface, compared with the prior method of simultaneously treating the inner surface and the outer surface of the seamless steel pipe by using an acid cleaning process, the method can obviously reduce the metal loss.
Description
Technical Field
The invention relates to the technical field of metallurgical rolling, in particular to a method for removing oxide skins on the inner and outer surfaces of a seamless steel pipe on line.
Background
Generally, a continuous heat treatment production line is adopted to carry out quenching and tempering heat treatment on large batches of seamless steel pipes. The quenching and tempering heat treatment process comprises quenching, tempering, cooling and straightening, and the continuous heat treatment production line equipment mainly comprises a quenching furnace, a high-pressure water descaling device, a water quenching device, a tempering furnace, a cooling bed and a straightening machine. The seamless steel pipe is heated in a quenching furnace, the heating temperature is generally above 850 ℃, so that oxide skin can be generated on the surface of the seamless steel pipe, the existence of the oxide skin can seriously affect the smoothness and the uniformity of the surface of the cold-rolled steel plate and the flatness of the inner surface and the outer surface, the subsequent straightening machine can be further damaged, and for the stainless steel seamless steel pipe, the stainless steel can be further subjected to stress corrosion.
At present, most of the acid washing is adopted to remove oxide skins on the inner surface and the outer surface of a seamless steel pipe, and a large amount of water is needed to wash acid washing liquid, and then the acid washing liquid is neutralized by alkali liquor, so that the waste of water resources is wasted, and serious environmental pollution is often caused. In order to effectively remove oxide skin, pickling needs to be continued for a long time, so that the loss of iron of a seamless pipe in a pickling process is large, hydrochloric acid and hydrofluoric acid pickling liquid have volatility, nitric acid can generate nitrogen oxide when stainless steel is pickled, air is seriously polluted, the service life of workshop equipment is shortened, and even operator poisoning can be caused.
In addition to descaling by acid pickling, there are also mechanical descaling processes and mechanical-chemical combined descaling processes, specifically including sand blasting, water-jet sand blasting, high-pressure hydrothermal descaling, wire brush scrubbing, rolling, high-temperature gas reduction, and the like, and these processes have limited effects or cannot replace pickling processes for removing scale on the surface of seamless pipes due to cost reasons.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for removing the oxide skin of the seamless steel tube on line, and the method provided by the application can reduce the metal loss of the seamless steel tube.
In view of the above, the present application provides a method for online removing scale on the inner and outer surfaces of a seamless steel pipe, comprising the following steps:
A) shot blasting is carried out on the outer surface of the seamless steel pipe, and then high-pressure scouring is carried out;
B) shielding and protecting the outer surface of the seamless steel pipe obtained in the step A), and then carrying out acid washing.
Preferably, the pressure of the shot is greater than 0.5 MPa.
Preferably, the pressure of the high-pressure scouring is 3-5 MPa.
Preferably, the method of shielding protection comprises: and winding the outer surface of the seamless steel pipe by adopting a polytetrafluoroethylene adhesive tape.
Preferably, the polytetrafluoroethylene adhesive tape is 0.4-0.6 mm in thickness and 100-300 mm in width and is wound by 2-4 layers.
Preferably, the acid solution is 1-2 wt% of hydrofluoric acid, 10-20 wt% of nitric acid and the balance of water.
Preferably, the pickling time is 3-5 min.
Preferably, the compressed air nozzle is used for cleaning oxide skin powder by using 0.4-0.6 MPa of compressed air during the shot blasting.
The application provides a method for removing oxide skin of a seamless steel pipe on line, which comprises the steps of firstly carrying out shot blasting treatment on the outer surface of the seamless steel pipe, washing and brushing to remove the oxide skin on the outer surface, carrying out acid washing after carrying out shielding protection on the outer surface of the seamless steel pipe, and further removing the oxide skin on the surface; the method of the invention separately treats the inner surface and the outer surface of the seamless steel pipe to remove the oxide skin, firstly carries out shot blasting treatment on the seamless steel pipe, and then carries out acid cleaning treatment on the inner surface, compared with the prior method of simultaneously treating the inner surface and the outer surface of the seamless steel pipe by using an acid cleaning process, the method can obviously reduce the metal loss.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the problems of large iron loss or high cost in the cleaning of seamless steel pipes in the prior art, the application provides a descaling process of shot blasting and pickling. Specifically, the embodiment of the invention discloses a method for removing oxide skins on the inner and outer surfaces of a seamless steel tube on line, which comprises the following steps:
A) shot blasting is carried out on the outer surface of the seamless steel pipe, and then high-pressure scouring is carried out;
B) shielding and protecting the outer surface of the seamless steel pipe obtained in the step A), and then carrying out acid washing.
The oxide skin is a product generated after oxidation reaction of iron and oxygen on the surface of the seamless steel pipe at high temperature, and mainly comprises FeO and Fe3O4、Fe2O3Composition, also containing a trace amount of SiO2And S, including coarse massive primary scale generated during heating and fine strip and granular secondary scale formed during rolling.
In the application, firstly, the outer surface of the seamless steel pipe is subjected to shot blasting, the power of shot blasting is compressed air, the shot blasting is safe and pollution-free, an acid washing process which seriously pollutes the environment and has huge energy consumption can be replaced to remove oxide skin, and plastic extrusion can be formed on the surface of the seamless steel pipe while the oxide skin can be removed by the shot blasting, so that the surface quality of the surface of the seamless steel pipe is enhanced; the shot blasting process can eliminate the defects of partial fine cracks, heavy skin and scratches on the surface of the seamless pipe. Compared with an acid washing process, the shot blasting process is simpler, has higher efficiency and is easier to realize large-scale flow line processing. In the application, high-strength ceramic shot blasting and low shot blasting pressure are adopted for seamless steel pipe products with higher surface quality requirements, so that the plastic deformation of the surfaces of the seamless steel pipe products is reduced; steel shot blasting and higher shot blasting pressure are adopted for products with lower surface quality requirements, so that the descaling effect is further improved; specifically, the pressure of the shot blasting is more than 0.5 MPa. The seamless steel pipe is shot-blasted, and simultaneously, the compressed air of 0.45MPa is used for scouring oxide scale powder.
After the shot blasting treatment is completed, most of the iron scale on the surface of the seamless steel pipe falls off due to the collision and the vibration of shot blasting, but powder is still adhered to the surface of the steel belt, so that the residual powder is removed by adopting high-pressure water flow with the pressure of 3-5 MPa for flushing.
According to the invention, the outer surface of the obtained seamless steel pipe is shielded and protected so as to avoid the influence on the outer surface in the acid pickling process. The outer surface of the seamless steel pipe is wound by a polytetrafluoroethylene adhesive tape; the polytetrafluoroethylene adhesive tape is 0.4-0.6 mm in thickness and 100-300 mm in width and is wound by 2-4 layers. According to the method, the inner surface of the seamless steel tube is cleaned by acid liquor, wherein the acid liquor specifically comprises 1-2 wt% of hydrofluoric acid, 10-20 wt% of nitric acid and the balance of water. The pickling time is 3-5 min. And finally, washing the inner surface of the seamless steel pipe by using clear water, and removing the polytetrafluoroethylene adhesive tape.
The invention separates the inner and outer surfaces of the seamless pipe to remove oxide skin, firstly carries out shot blasting treatment on the seamless pipe which is perforated, and carries out pickling treatment after winding the outer surface of the seamless pipe by using a winding polytetrafluoroethylene adhesive tape.
For further understanding of the present invention, the method for online removing scale inside and outside a seamless steel pipe according to the present invention is described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
105 x 9 seamless pipes are produced, the seamless pipes which are subjected to the perforation process are subjected to shot blasting, and high-strength ceramic shot blasting is used for preventing the surface of the steel strip from being damaged due to overhigh steel shot blasting hardness; in the shot blasting process, the compressed air with the pressure of 0.45MPa is used for blowing away oxide skin powder broken on the surface of the steel strip by shot blasting through a compressed air nozzle, and then the surface of the seamless steel tube is washed and cleaned by high-pressure water flow with the pressure of 3MPa to adsorb the oxide skin powder, so that the oxide skin removing effect of the shot blasting is improved;
winding a polytetrafluoroethylene tape on the outer surface of the seamless pipe subjected to the shot blasting treatment, and pickling the wound seamless pipe, wherein a pickling solution consists of 2% of hydrofluoric acid, 10% of nitric acid and water; and cleaning the inner surface of the seamless pipe by using clear water, and finally removing the polytetrafluoroethylene adhesive tape (with the thickness of 0.4-0.6 mm, the width of 100-300 mm and 2-4 layers of winding) on the outer surface.
After inspection, the seamless tube surface treated by the process has the advantages of reduced outer diameter by 0.1 mm, reduced wall thickness by 1.5 percent and weight loss of 1.7 percent.
Example 2
Producing 68 x 10 seamless pipes, performing shot blasting treatment on the seamless pipes subjected to the perforation process, and using high-strength ceramic shot blasting to prevent the surface of the steel strip from being damaged due to overhigh steel shot blasting hardness; in the shot blasting process, the compressed air nozzle is used for blowing off oxide scale powder which is smashed on the surface of the steel strip by shot blasting by using compressed air with the pressure of 0.45MPa, and after the shot blasting treatment is finished, the oxide scale on the surface of the seamless pipe is basically fallen off due to the collision and the vibration of the shot blasting, but the powder is still adhered to the surface of the steel strip; then washing and cleaning the surface of the seamless steel pipe by using high-pressure water flow with the pressure of 2MPa to adsorb scale powder, and improving the scale removing effect of shot blasting;
winding a polytetrafluoroethylene tape on the outer surface of the seamless pipe subjected to the shot blasting treatment, and pickling the wound seamless pipe, wherein a pickling solution consists of 2% of hydrofluoric acid, 10% of nitric acid and water; then clear the inner surface of the seamless tube with clean water, and finally remove the polytetrafluoroethylene tape on the outer surface.
After inspection, the seamless tube surface treated by the process has the advantages of reduced outer diameter by 0.12 mm, wall thickness reduction by 1.2 percent and weight loss by 2 percent.
Example 3
Producing 200 x 15 seamless pipes, performing shot blasting treatment on the seamless pipes subjected to the perforation process, and using high-strength ceramic shot blasting to prevent the surface of a steel strip from being damaged due to overhigh steel shot blasting hardness; in the shot blasting process, the compressed air nozzle is used for blowing off oxide scale powder which is smashed on the surface of the steel strip by shot blasting by using compressed air with the pressure of 0.45MPa, and after the shot blasting treatment is finished, the oxide scale on the surface of the seamless pipe is basically fallen off due to the collision and the vibration of the shot blasting, but the powder is still adhered to the surface of the steel strip; then washing and cleaning the surface of the seamless steel pipe by using high-pressure water flow with the pressure of 3MPa to adsorb scale powder, and improving the scale removing effect of shot blasting;
winding a polytetrafluoroethylene tape on the outer surface of the seamless pipe subjected to the shot blasting treatment, and pickling the wound seamless pipe, wherein a pickling solution consists of 2% of hydrofluoric acid, 10% of nitric acid and water; then clear water is used for cleaning the inner surface of the seamless pipe, and finally the polytetrafluoroethylene adhesive tape on the outer surface is removed.
After inspection, the seamless tube surface treated by the process has the advantages of reduced outer diameter by 0.05 mm, reduced wall thickness by 0.7 percent and weight loss of 1.2 percent.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for removing oxide skin on the inner surface and the outer surface of a seamless steel pipe on line comprises the following steps:
A) shot blasting is carried out on the outer surface of the seamless steel pipe, and then high-pressure scouring is carried out;
B) shielding and protecting the outer surface of the seamless steel pipe obtained in the step A), and then carrying out acid washing.
2. The method according to claim 1, wherein the pressure of the shot is greater than 0.5 MPa.
3. The method according to claim 1, wherein the pressure of the high-pressure flushing is 3-5 MPa.
4. The method of claim 1, wherein the method of shadow protection is: and winding the outer surface of the seamless steel pipe by adopting a polytetrafluoroethylene adhesive tape.
5. The method according to claim 1, wherein the polytetrafluoroethylene tape has a thickness of 0.4 to 0.6mm and a width of 100 to 300mm, and is wound in 2 to 4 layers.
6. The method according to claim 1, wherein the acid solution comprises 1-2 wt% hydrofluoric acid, 10-20 wt% nitric acid and the balance water.
7. The method according to claim 1, wherein the pickling time is 3 to 5 min.
8. The method according to claim 1, wherein the blasting is performed while removing scale powder by a compressed air nozzle using compressed air of 0.4 to 0.6 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355586.8A CN114700882A (en) | 2022-04-06 | 2022-04-06 | Method for online removing oxide skin on inner surface and outer surface of seamless steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355586.8A CN114700882A (en) | 2022-04-06 | 2022-04-06 | Method for online removing oxide skin on inner surface and outer surface of seamless steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114700882A true CN114700882A (en) | 2022-07-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210355586.8A Pending CN114700882A (en) | 2022-04-06 | 2022-04-06 | Method for online removing oxide skin on inner surface and outer surface of seamless steel tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114700882A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131126A (en) * | 1990-04-20 | 1992-07-21 | Kawasaki Steel Corporation | Method for descaling hot-rolled stainless steel strip |
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| CN103878109A (en) * | 2012-12-24 | 2014-06-25 | 重庆市江津区通达机械厂 | Anticorrosive and rustproof treatment processing technology for seamless steel pipes |
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| CN105499287A (en) * | 2015-12-29 | 2016-04-20 | 何百寅 | Method for removing scales of hot-rolled nickel and chromium stainless steel materials |
| KR20190042119A (en) * | 2017-10-13 | 2019-04-24 | 김종백 | Gloss treatment method of the surface of stainless hot forging products |
| CN110344042A (en) * | 2019-07-19 | 2019-10-18 | 浙江瑞浦科技有限公司 | A kind of surface treatment method of stainless steel rebar with ribbing |
-
2022
- 2022-04-06 CN CN202210355586.8A patent/CN114700882A/en active Pending
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|---|---|---|---|---|
| US5131126A (en) * | 1990-04-20 | 1992-07-21 | Kawasaki Steel Corporation | Method for descaling hot-rolled stainless steel strip |
| CN102126185A (en) * | 2010-09-29 | 2011-07-20 | 杭州九龙厨具制造有限公司 | Shot peening process for removing scale on surface of steel belt |
| CN103878109A (en) * | 2012-12-24 | 2014-06-25 | 重庆市江津区通达机械厂 | Anticorrosive and rustproof treatment processing technology for seamless steel pipes |
| CN104149034A (en) * | 2014-08-22 | 2014-11-19 | 攀钢集团成都钢钒有限公司 | Method for removing oxide layers on inner surface and outer surface of titanium alloy seamless tube |
| CN105499287A (en) * | 2015-12-29 | 2016-04-20 | 何百寅 | Method for removing scales of hot-rolled nickel and chromium stainless steel materials |
| KR20190042119A (en) * | 2017-10-13 | 2019-04-24 | 김종백 | Gloss treatment method of the surface of stainless hot forging products |
| CN110344042A (en) * | 2019-07-19 | 2019-10-18 | 浙江瑞浦科技有限公司 | A kind of surface treatment method of stainless steel rebar with ribbing |
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| Title |
|---|
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Application publication date: 20220705 |