CN105695863B - A kind of natural gas transmission pipeline hot-rolled coil and its manufacture method - Google Patents
A kind of natural gas transmission pipeline hot-rolled coil and its manufacture method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The present invention relates to a kind of natural gas transmission pipeline hot-rolled coil, its chemical composition is：C：0.015~0.055wt%, Si：0.05~0.30wt%, Mn：0.80~1.50wt%, P≤0.012wt%, S≤0.001wt%, V：0.05~0.08wt%, Nb：0.040~0.070wt%, Cr：0.10~0.40wt%, Ti：0.010~0.050wt%, Ni：0.10~0.30wt%, Cu：0.10~0.30wt%, surplus are Fe and inevitable impurity.The manufacture method of hot-rolled coil is further related to, is comprised the following steps：Molten steel obtains strand after converter smelting；Strand is put into heating furnace to be heated；Strand after heating is put into milling train to be rolled, obtains hot rolled plate；Hot rolled plate is cooled down；Hot rolled plate after cooling is batched, obtains hot-rolled coil.For the tissue for the natural gas transmission pipeline hot-rolled coil that the manufacture method ensures to produce based on polygonal ferrite, it has excellent hydrogen sulfide corrosion resistance energy concurrently while having high intensity, high tenacity.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of natural gas transmission pipeline hot-rolled coil and its manufacturer
Method.
Background technology
With the increasingly depleted in high quality oils gas field in world wide, contain higher low of acid sulphide and salt content
The proportion of quality oil-gas field development gradually increases.Demand of the pipe line steel in the market to the pipe line steel with hydrogen sulfide corrosion resistance energy
It is increasingly vigorous.In order to improve discharge pressure, reduce pipe-line construction cost, Hi-grade steel, high-performance have been following pipe line steel development
Main trend.The high-level hydrogen sulfide corrosion resistant pipe line steel most intensity that batch uses in world wide at present is only X65MS, right
The exploitation demand of X70MS even more high grade products is growing.
The pipe line steel generally use polygonal ferrite of X65MS and following grade of steel+few pearlitic structrure, its anti-H 2 S are rotten
Corrosion can worldwide each large-engineering be verified.And for the pipe line steel of X70 ranks, to ensure that its is good
Good comprehensive mechanical property, organization type of its generally use based on granular bainite, acicular ferrite, due to granular bayesian
More M/A island structures in body, acicular ferrite be present, twin crystal martensite lath therein is elongated, and hardness is higher, easily draws
Play H+ aggregation and cause hydrogen induced cracking (HIC) defect, therefore its hydrogen sulfide corrosion resistance can have dispute always.
The hydrogen sulfide corrosion resistance energy and comprehensive mechanical property of line steel hot rolling roll bending of the prior art be not high, can not
Adapt to demand of the market to high-performance pipe line steel.
The content of the invention
The invention provides a kind of natural gas transmission pipeline hot-rolled coil and its manufacture method, solves or part solves
The hydrogen sulfide corrosion resistance energy of line steel hot rolling roll bending and the not high technical problem of comprehensive mechanical property in the prior art, it is real
The technique effect for ensureing to have excellent hydrogen sulfide corrosion resistance energy while roll bending has high intensity, high tenacity concurrently is showed.
A kind of chemical composition of natural gas transmission pipeline hot-rolled coil provided by the invention is as follows：By percentage to the quality
Calculate, C：0.015~0.055wt%, Si：0.05~0.30wt%, Mn：0.80~1.50wt%, P≤0.012wt%, S≤
0.001wt%, V：0.05~0.08wt%, Nb：0.040~0.070wt%, Cr：0.10~0.40wt%, Ti：0.010~
0.050wt%, Ni：0.10~0.30wt%, Cu：0.10~0.30wt%, surplus are Fe and inevitable impurity.
Preferably, the Main Tissues of the hot-rolled coil are polygonal ferrite；
The hot-rolled coil also includes pearlitic structrure.
Preferably, by percentage to the quality, welding cold cracking sensitive organization Pcm≤0.15% of the hot-rolled coil；
Wherein, the calculation formula of the welding cold cracking sensitive organization Pcm is：
Pcm=w (C)+w (Si)/30+【w(Mn)+w(Cr)+w(Cu)】/20+w(Ni)/60+w(Mo)/15+w(V)/10+
5w (B), unit %.
Preferably, the parameter index of the hot-rolled coil includes：
Yield strength is 485~635MPa；
Tensile strength is 570~760MPa；
Elongation percentage is more than or equal to 23%；
Yield tensile ratio is less than or equal to 0.93；
The value of vickers hardness hv 10 is less than or equal to 250；
Impact flexibility CVN is more than or equal to 160J under the conditions of -20 DEG C；
The section of shear of DWTT is more than or equal to 85% under the conditions of -15 DEG C.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of the component system without Mo, pass through the complex intensifying effect of the alloying elements such as Nb-V-Ti-Cu-Ni-Cr
To ensure the preferable comprehensive mechanical property of roll bending, emphasis make use of Nb strong refined crystalline strengthening effect and V precipitation strength to imitate
Fruit, by the composition design of the low manganese low-sulfur of low-carbon, and the Cu members added usually ensure the hydrogen sulfide corrosion resistance energy of coil of strip.This
Sample, hydrogen sulfide corrosion resistance energy and the comprehensive mechanical property for efficiently solving line steel hot rolling roll bending in the prior art be not high
Technical problem, realize the skill for ensureing to have excellent hydrogen sulfide corrosion resistance energy while roll bending has high intensity, high tenacity concurrently
Art effect.
The manufacture method of natural gas transmission pipeline hot-rolled coil provided by the invention comprises the following steps：
Molten steel obtains strand after converter smelting；The chemical composition of the strand is as follows：Calculate by percentage to the quality, C：
0.015~0.055wt%, Si：0.05~0.30wt%, Mn：0.80~1.50wt%, P≤0.012wt%, S≤
0.001wt%, V：0.05~0.08wt%, Nb：0.040~0.070wt%, Cr：0.10~0.40wt%, Ti：0.010~
0.050wt%, Ni：0.10~0.30wt%, Cu：0.10~0.30wt%, surplus are Fe and inevitable trace impurity；
The strand is put into heating furnace to be heated；
The strand after heating is put into milling train to be rolled, obtains hot rolled plate；
The hot rolled plate is cooled down；
The hot rolled plate after cooling is batched, obtains the hot-rolled coil.
Preferably, the molten steel obtains strand after converter smelting, including：
Molten iron is pre-processed, it is ensured that the S contents w (S) in the molten iron is less than 0.005%；
The molten iron is added into the converter to be smelted；
Wherein, after the converter is refined by LF+RH, Ca lines is added and carry out inclusion modification；In the smelting process, adopt
Cast with low overheat, and use low pulling rate.
Preferably, in the 2 Mo Steel Slab during Heating Process, the time control of the heating process in 180~300min, wherein,
The soaking zone time is less than 60min；
The tapping temperature of the strand is 1180~1220 DEG C.
Rolled preferably, the strand after heating is put into milling train, including：
Roughing is carried out to the strand, generates roughing plate；The rough rolling step rolls 6~8 passages；The rough rolling step is each
The reduction ratio of passage gradually increases, and the drafts of extreme trace time is more than 20mm；The outlet temperature of the roughing is 950~1010 DEG C；
Finish rolling is carried out to the roughing plate, generates the hot rolled plate；The inlet temperature of the finish rolling is less than or equal to 960 DEG C,
Finishing temperature is 820 DEG C~900 DEG C；The total deformation of the finish rolling is more than 65%.
Preferably, the hot rolled plate is cooled down, including：
Section cooling is carried out to the hot rolled plate；The section cooling uses leading portion rapid cooling pattern；
The hot rolled plate is accurately cooled down.
Preferably, the target oiler temperature control in the coiling process is 540~600 DEG C.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of improvement smelting process parameter, while optimize the defects of avoiding or mitigate center segregation of continuous casting process
Generation, by the optimization of heating cycle and the improvement fining austenite grains of roughing technique, and pass through the excellent of finish-rolling process
Change makes austenite fully flatten, and the strain for increasing austenite adds up effect, by the control of cooling technique, obtains coil of strip tiny
The uniformly tissue based on polygonal ferrite, with excellent antiacid while making roll bending finished product with excellent mechanical performances
Performance.So, the hydrogen sulfide corrosion resistance energy of line steel hot rolling roll bending in the prior art and comprehensive mechanical property are efficiently solved
Technical problem that can not be high, realizes and ensures to have excellent hydrogen sulfide corrosion resistant while roll bending has high intensity, high tenacity concurrently
The technique effect of performance.
Brief description of the drawings
Fig. 1 is the flow chart of natural gas transmission pipeline hot-rolled coil manufacture method provided by the invention；
Fig. 2 is the metallographic structure figure of natural gas transmission pipeline hot-rolled coil provided by the invention.
Embodiment
The embodiment of the present application provides a kind of natural gas transmission pipeline hot-rolled coil and its manufacture method, solves or portion
Divide and solve the hydrogen sulfide corrosion resistance energy of line steel hot rolling roll bending in the prior art and the technology that comprehensive mechanical property is not high
Problem, by improving smelting process parameter, while optimize continuous casting process, optimize heating cycle and improve roughing technique, realize
Ensure to have concurrently while roll bending has high intensity, high tenacity excellent hydrogen sulfide corrosion resistance can technique effect.
A kind of chemical composition for natural gas transmission pipeline hot-rolled coil that the embodiment of the present application provides is as follows：With quality hundred
Divide than calculating, C：0.015~0.055wt%, Si：0.05~0.30wt%, Mn：0.80~1.50wt%, P≤0.012wt%,
S≤0.001wt%, V：0.05~0.08wt%, Nb：0.040~0.070wt%, Cr：0.10~0.40wt%, Ti：0.010
~0.050wt%, Ni：0.10~0.30wt%, Cu：0.10~0.30wt%, surplus are Fe and inevitable impurity.Its
In, by the reasonable addition of emphasis alloying element, significantly improve its hydrogen sulfide corrosion resistance energy.
Further, the Main Tissues of hot-rolled coil are polygonal ferrite；Hot-rolled coil also includes a small amount of pearlite group
Knit, referring to accompanying drawing 2, microscopic structure is based on polygonal ferrite, also a small amount of pearlitic structrure, and the type is organized as ensureing steel
The hydrogen sulfide corrosion resistance of volume can be highly beneficial.The parameter index of hot-rolled coil includes：Yield strength is 485~635MPa；It is anti-
Tensile strength is 570~760MPa；Elongation percentage is more than or equal to 23%；Yield tensile ratio is less than or equal to 0.93；The value of vickers hardness hv 10 is small
In equal to 250；Impact flexibility CVN is more than or equal to 160J under the conditions of -20 DEG C；The shear surface of DWTT under the conditions of -15 DEG C
Product is more than or equal to 85%.
Further, by percentage to the quality, welding cold cracking sensitive organization Pcm≤0.15% of hot-rolled coil；Wherein
Welding cold cracking sensitive organization Pcm calculation formula is：
Pcm=w (C)+w (Si)/30+【w(Mn)+w(Cr)+w(Cu)】/20+w(Ni)/60+w(Mo)/15+w(V)/10+
5w (B), unit %.Wherein, w (C) is the mass percent of carbon content in hot-rolled coil, and w (Si) is that silicon contains in hot-rolled coil
The mass percent of amount, w (Mn) are the mass percent of manganese content in hot-rolled coil, and w (Cr) is chromium content in hot-rolled coil
Mass percent, w (Cu) are the mass percent of copper content in hot-rolled coil, and w (Ni) is the quality of nickel content in hot-rolled coil
Percentage, w (V) are the mass percent of content of vanadium in hot-rolled coil, and w (Mo) is the quality percentage of molybdenum content in hot-rolled coil
Than being the mass percent that 0, w (B) is Boron contents in hot-rolled coil, being 0.
Using low C, low Mn, low P composition design.Relatively low C/Mn/P contents can reduce the generation of center segregation, keep away
Exempt from the formation of coil of strip medium pearlite banded structure, advantageously ensure that the hydrogen sulfide corrosion resistance energy of coil of strip.In addition, relatively low C contains
Amount can cause material to have good solderability.
S≤0.001% is controlled, S is highly unwanted element to HIC, and it is that HIC is most easily nucleated that the MnS of generation, which is mingled with,
Position, it is and very unfavorable to toughness.In order to reduce MnS field trashes to the hydrogen sulfide corrosion resistance energy of steel and the influence of toughness,
First have to reduce S contents as far as possible, secondly MnS field trashes is changed into CaS folders using the technique of Calcium treatment in steelmaking process
Debris.Therefore, S contents even require to be less than 0.001%.
Using the V element of high level, to ensure that coil of strip has excellent Antacid effectiveness, the tissue of the hot-rolled coil is with more
Based on the shape ferrite of side.Therefore to ensure the intensity of coil of strip, the V element of high level, the higher coiling temperature of use, profit are added
Ensure the intensity of coil of strip with V strong precipitation strength ability.
0.10~0.30wt% Cu and Ni have been separately added into hot-rolled coil.Cu has certain corrosion resistance, and can lead to
Cross the intensity that solution strengthening improves steel.Ni addition can be effectively improved Cu easily caused red brittleness in steel, and can be effective
Improve the toughness of coil of strip.
Using 0.040~0.070wt% Nb elements, the consideration of refined crystalline strengthening and precipitation strength is mainly based upon.Nb is
Main refined crystalline strengthening element, suppress the generation of recrystallization during high temperature deformation.While by being dissolved the towing of Nb elements
The inhibition that effect and Nb (C, N) are separated out, the recovery and recrystallization and crystal grain for suppressing austenite are grown up, particularly the finish rolling stage
The low temperature large deformation of Unhydrated cement can significant refining grain size, improve material intensity while also ensure that it
Toughness.
Using 0.10~0.40wt% Cr elements.Cr has the effect of significant solution strengthening, can make up due to low C
Caused by intensity deficiency.Cr reduces γ → α phase transition temperatures simultaneously, obtains tiny phase-change product, improves the plasticity and toughness of material.
The hot-rolled coil requires Pcm≤0.15%, using low-alloy component system, has relatively low carbon equivalent, is advantageous to
The weldability of material.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of the component system without Mo, pass through the complex intensifying effect of the alloying elements such as Nb-V-Ti-Cu-Ni-Cr
To ensure the preferable comprehensive mechanical property of roll bending, emphasis make use of Nb strong refined crystalline strengthening effect and V precipitation strength to imitate
Fruit, by the composition design of the low manganese low-sulfur of low-carbon, and the Cu members added usually ensure the hydrogen sulfide corrosion resistance energy of coil of strip.This
Sample, hydrogen sulfide corrosion resistance energy and the comprehensive mechanical property for efficiently solving line steel hot rolling roll bending in the prior art be not high
Technical problem, realize the skill for ensureing to have excellent hydrogen sulfide corrosion resistance energy while roll bending has high intensity, high tenacity concurrently
Art effect.
Referring to accompanying drawing 1, the manufacture method of the natural gas transmission pipeline hot-rolled coil that the embodiment of the present application provides include with
Lower step：
S1：Molten steel obtains strand after converter smelting；The chemical composition of strand is as follows：Calculate by percentage to the quality, C：
0.015~0.055wt%, Si：0.05~0.30wt%, Mn：0.80~1.50wt%, P≤0.012wt%, S≤
0.001wt%, V：0.05~0.08wt%, Nb：0.040~0.070wt%, Cr：0.10~0.40wt%, Ti：0.010~
0.050wt%, Ni：0.10~0.30wt%, Cu：0.10~0.30wt%, surplus are Fe and inevitable impurity.Smelted
Journey includes：S101：Molten iron is pre-processed, it is ensured that the S contents w (S) in molten iron is less than 0.005%.S102：Molten iron is added
Converter is smelted.Wherein, after converter is refined by LF+RH, Ca lines is added and carry out inclusion modification；In smelting process, use
Low overheat is cast, and uses low pulling rate, with reference to casting blank solidification end dynamic soft-reduction, center segregation is effectively controlled
System.
S2：Strand is put into heating furnace to be heated；In 2 Mo Steel Slab during Heating Process, the time control of heating process 180~
300min, wherein, the soaking zone time is less than 60min；The tapping temperature of strand is 1180~1220 DEG C.
Wherein, optimize heating cycle, realize the roughening within reason of original austenite tissue.Its priority control is equal in high temperature
The time of hot arc, make soaking zone time ＜ 60min, reduce the roughening of austenite crystal；Tapping temperature after heating of plate blank simultaneously
For 1180 DEG C~1220 DEG C, the heat time is controlled in 180~300min, makes prior austenite in the case where ensureing that alloying element is fully dissolved
Body is not roughened too.
S3：Strand after heating is put into milling train to be rolled, obtains hot rolled plate.The operation of rolling includes：S301：To strand
Roughing is carried out, generates roughing plate；Rough rolling step rolls 6~8 passages；The reduction ratio of each passage of rough rolling step gradually increases, extreme trace
Secondary drafts is more than 20mm；The outlet temperature of roughing is 950~1010 DEG C.S302：Finish rolling is carried out to roughing plate, generates hot rolling
Plate；The inlet temperature of finish rolling is less than or equal to 960 DEG C, and finishing temperature is 820 DEG C~900 DEG C；The total deformation of finish rolling is more than 65%.
Wherein, to make original austenite fully refine, roughing technique is optimized.Rough rolling step uses each road of roughing
Secondary reduction ratio gradually increases, and last reduction in pass answers ＞ 20mm, and roughing outlet temperature is 950 DEG C~1010 DEG C.Roughing passage
Gradually increased purpose is to ensure the advance refinement of austenite crystal to reduction ratio.The temperature control and pressure of the last a time of roughing
Lower amount is ensured of to accelerate originally slowly steel austenite static recrystallization behavior so that after rolling, in roughing and finishing mill
The perfect recrystallization of austenite crystal is completed in frame, austenite crystal is uniformly refined, so as to make to greatest extent in variant
High-angle boundary or Effective grain size quantity increase.The finish rolling stage is smart by reducing on the basis of austenite fully refines
The temperature in stage is rolled, the big pressure deformation of low temperature is realized, increases Strain Accumulation effect, variant tissue is fully refined, make plate
The intensity and toughness of volume are effectively lifted.To ensure relatively low roughing outlet temperature, while Low Temperature Finish process is realized, essence
Roll inlet temperature requirements≤960 DEG C；Finishing temperature is 820 DEG C~900 DEG C；Total deformation ＞ 65%.
S4：Hot rolled plate is cooled down；Cooling procedure includes：S401：Section cooling is carried out to hot rolled plate；Section cooling is adopted
With leading portion rapid cooling pattern.S402：Hot rolled plate is accurately cooled down.
S5：Hot rolled plate after cooling is batched, obtains hot-rolled coil.Target oiler temperature control in coiling process
For 540~600 DEG C.
Wherein, control cooling includes section cooling and cold sperm pattern after rolling.Section cooling uses the pattern of leading portion rapid cooling,
Suppress precipitation of the precipitate in hot stage.After back segment section cooling and cold sperm pattern, coiling temperature is 540 DEG C~600 DEG C,
So as to obtain the tissue based on polygonal ferrite.The refinement of original austenite makes the number of effective particle size and high-angle boundary
Amount increases, and makes coil of strip suppress to open the ability of splitting and the enhancing of crack arrest ability, makes the toughness of coiled sheet strengthen.Leading portion quickly cools down promotion simultaneously
Tiny, disperse the toughness for being distributed on matrix, not damaging steel of Nb, V carbonitride.
The manufacture method ensures the intensity of coiled sheet using the reinforcing such as precipitation strength, solution strengthening, refined crystalline strengthening means；Together
When by rolling Technology Optimization, refine and contain mass efficient crystallite dimension in room temperature texture, improve high-angle boundary ratio so that
The effective high tenacity for ensureing coiled sheet.
With reference to the accompanying drawings and examples to the manufacture method of natural gas transmission pipeline hot-rolled coil provided by the invention
It is described in detail.
Embodiment one
The manufacture method concretely comprises the following steps：
S1：Molten steel obtains strand after converter smelting；The chemical composition of strand is as follows：Calculate by percentage to the quality, C：
0.027wt%, Si：0.161wt%, Mn：1.14wt%, P：0.0098wt%, S：0.0008wt%, V：0.0577wt%, Nb+
Ti：0.0685wt%, Cr：0.214wt%, Ni+Cu：0.416wt%, surplus are Fe and inevitable impurity.Weld cold cracking
Line sensitive organization Pcm=0.121.
S2：Strand is put into heating furnace to be heated；In 2 Mo Steel Slab during Heating Process, the time control of heating process exists
261min, wherein, soaking zone time 42min；The tapping temperature of strand is 1198 DEG C.
S3：Strand after heating is put into milling train to be rolled, obtains hot rolled plate.Rolling the secondary drafts of extreme trace is
22mm；Finishing temperature is 820 DEG C.
S4：Hot rolled plate is cooled down；Section cooling first is carried out to hot rolled plate, section cooling uses leading portion rapid cooling pattern.
Hot rolled plate is accurately cooled down again.
S5：Hot rolled plate after cooling is batched, acquisition hot-rolled coil, the target oiler temperature control in coiling process
For 562 DEG C.
The mechanical property of obtained natural gas transmission pipeline hot-rolled coil：Yield strength is 505MPa, and tensile strength is
590MPa, elongation percentage 45%, yield tensile ratio 0.86；The value of vickers hardness hv 10 is equal to 206；Impact is welded under the conditions of -20 DEG C
Toughness CVN is 480/421/452J；The section of shear of DWTT is 100% under the conditions of -15 DEG C.
Embodiment two
The manufacture method concretely comprises the following steps：
S1：Molten steel obtains strand after converter smelting；The chemical composition of strand is as follows：Calculate by percentage to the quality, C：
0.0308wt%, Si：0.141wt%, Mn：1.13wt%, P：0.007wt%, S：0.0006wt%, V：0.0573wt%, Nb+
Ti：0.0714wt%, Cr：0.217wt%, Ni+Cu：0.432wt%, surplus are Fe and inevitable impurity.Weld cold cracking
Line sensitive organization Pcm=0.124.
S2：Strand is put into heating furnace to be heated；In 2 Mo Steel Slab during Heating Process, the time control of heating process exists
279min, wherein, soaking zone time 53min；The tapping temperature of strand is 1207 DEG C.
S3：Strand after heating is put into milling train to be rolled, obtains hot rolled plate.Rolling the secondary drafts of extreme trace is
21mm；Finishing temperature is 835 DEG C.
S4：Hot rolled plate is cooled down；Section cooling first is carried out to hot rolled plate, section cooling uses leading portion rapid cooling pattern.
Hot rolled plate is accurately cooled down again.S5：Hot rolled plate after cooling is batched, acquisition hot-rolled coil, in coiling process
Target oiler temperature control is 543 DEG C.
The mechanical property of obtained natural gas transmission pipeline hot-rolled coil：Yield strength is 515MPa, and tensile strength is
580MPa, elongation percentage 44%, yield tensile ratio 0.89；The value of vickers hardness hv 10 is equal to 206；Impact is welded under the conditions of -20 DEG C
Toughness CVN is 428/437/446J；The section of shear of DWTT is 100% under the conditions of -15 DEG C.
Embodiment three
The manufacture method concretely comprises the following steps：
S1：Molten steel obtains strand after converter smelting；The chemical composition of strand is as follows：Calculate by percentage to the quality, C：
0.0308wt%, Si：0.141wt%, Mn：1.13wt%, P：0.007wt%, S：0.0006wt%, V：0.0573wt%, Nb+
Ti：0.0714wt%, Cr：0.217wt%, Ni+Cu：0.432wt%, surplus are Fe and inevitable impurity.Weld cold cracking
Line sensitive organization Pcm=0.124.
S2：Strand is put into heating furnace to be heated；In 2 Mo Steel Slab during Heating Process, the time control of heating process exists
258min, wherein, soaking zone time 35min；The tapping temperature of strand is 1189 DEG C.
S3：Strand after heating is put into milling train to be rolled, obtains hot rolled plate.Rolling the secondary drafts of extreme trace is
23mm；Finishing temperature is 855 DEG C.
S4：Hot rolled plate is cooled down；Section cooling first is carried out to hot rolled plate, section cooling uses leading portion rapid cooling pattern.
Hot rolled plate is accurately cooled down again.S5：Hot rolled plate after cooling is batched, acquisition hot-rolled coil, in coiling process
Target oiler temperature control is 589 DEG C.
The mechanical property of obtained natural gas transmission pipeline hot-rolled coil：Yield strength is 515MPa, and tensile strength is
590MPa, elongation percentage 42%, yield tensile ratio 0.87；The value of vickers hardness hv 10 is equal to 204；Impact is welded under the conditions of -20 DEG C
Toughness CVN is 441/427/445J；The section of shear of DWTT is 100% under the conditions of -15 DEG C.
Finally, hot-rolled coil made from embodiment one to three is subjected to antiacid experiment, as a result as shown in table 1, completes hic resistance
After anti-SSCC corrosion tests, the equal flawless of roll bending sample, showing the hot-rolled coil of the present invention has good anti-H 2 S rotten
Corrosion energy.
Table 1
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of improvement smelting process parameter, while optimize the defects of avoiding or mitigate center segregation of continuous casting process
Generation, by the optimization of heating cycle and the improvement fining austenite grains of roughing technique, and pass through the excellent of finish-rolling process
Change makes austenite fully flatten, and the strain for increasing austenite adds up effect, by the control of cooling technique, obtains coil of strip tiny
The uniformly tissue based on polygonal ferrite, with excellent antiacid while making roll bending finished product with excellent mechanical performances
Performance.So, the hydrogen sulfide corrosion resistance energy of line steel hot rolling roll bending in the prior art and comprehensive mechanical property are efficiently solved
Technical problem that can not be high, realizes and ensures to have excellent hydrogen sulfide corrosion resistant while roll bending has high intensity, high tenacity concurrently
The technique effect of performance.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
It is bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention
Protection domain within.
Claims (7)
- A kind of 1. natural gas transmission pipeline hot-rolled coil, it is characterised in thatThe chemical composition of the hot-rolled coil is as follows：Calculate by percentage to the quality, C：0.015 ~ 0.055wt%, Si：0.05~0.30 Wt%, Mn：0.80 ~ 1.50 wt%, P≤0.012wt%, S≤0.001wt%, V：0.05 ~ 0.08wt%, Nb：0.040~ 0.070wt%, Cr：0.10 ~ 0.40 wt%, Ti：0.010 ~ 0.050 wt%, Ni：0.10 ~ 0.30wt%, Cu：0.10 ~ 0.30wt%, Surplus is Fe and inevitable impurity；The Main Tissues of the hot-rolled coil are polygonal ferrite；The hot-rolled coil is also Include pearlitic structrure.
- 2. hot-rolled coil as claimed in claim 1, it is characterised in thatBy percentage to the quality, welding cold cracking sensitive organization Pcm≤0.15% of the hot-rolled coil；Wherein, the calculation formula of the welding cold cracking sensitive organization Pcm is：Pcm=w（C）+w（Si）/30+【w（Mn）+w（Cr）+w（Cu）】/20+w（Ni）/60+w（Mo）/15+w（V）/10+5w（B）, Unit is %.
- 3. hot-rolled coil as claimed in claim 1, it is characterised in that the parameter index of the hot-rolled coil includes：Yield strength is 485 ~ 635 MPa；Tensile strength is 570 ~ 760 MPa；Elongation percentage is more than or equal to 23%；Yield tensile ratio is less than or equal to 0.93；The value of vickers hardness hv 10 is less than or equal to 250；Impact flexibility CVN is more than or equal to 160J under the conditions of -20 DEG C；The section of shear of DWTT is more than or equal to 85% under the conditions of -15 DEG C.
- 4. a kind of manufacture method of natural gas transmission pipeline hot-rolled coil, defeated for the natural gas described in manufacturing claims 1 Send pipeline hot-rolled coil, it is characterised in that comprise the following steps：Molten steel obtains strand after converter smelting；The chemical composition of the strand is as follows：Calculate by percentage to the quality, C： 0.015 ~ 0.055wt%, Si：0.05 ~ 0.30 wt%, Mn：0.80 ~ 1.50 wt%, P≤0.012wt%, S≤0.001wt%, V： 0.05 ~ 0.08wt%, Nb：0.040 ~ 0.070wt%, Cr：0.10 ~ 0.40 wt%, Ti：0.010 ~ 0.050 wt%, Ni：0.10~ 0.30wt%, Cu：0.10 ~ 0.30wt%, surplus are Fe and inevitable impurity；The strand is put into heating furnace to be heated；The strand after heating is put into milling train to be rolled, obtains hot rolled plate；The rolling includes：The strand is carried out Roughing, generate roughing plate；The rough rolling step rolls 6 ~ 8 passages；The reduction ratio of each passage of rough rolling step gradually increases, end The drafts of passage is more than 20mm；The outlet temperature of the roughing is 950 ~ 1010 DEG C；Finish rolling, generation are carried out to the roughing plate The hot rolled plate；The inlet temperature of the finish rolling is less than or equal to 960 DEG C, and finishing temperature is 820 DEG C ~ 900 DEG C；The finish rolling it is total Deflection is more than 65%；The hot rolled plate is cooled down；The hot rolled plate after cooling is batched, obtains the hot-rolled coil；Target in the coiling process batches temperature Degree control is 540 ~ 600 DEG C.
- 5. manufacture method as claimed in claim 4, it is characterised in that the molten steel obtains strand after converter smelting, bag Include：Molten iron is pre-processed, it is ensured that the S contents w in the molten iron（S）Less than 0.005%；The molten iron is added into the converter to be smelted；Wherein, after the converter is refined by LF+RH, Ca lines is added and carry out inclusion modification；In the smelting process, use is low The degree of superheat is cast, and uses low pulling rate.
- 6. manufacture method as claimed in claim 4, it is characterised in thatIn the 2 Mo Steel Slab during Heating Process, the time control of the heating process in 180 ~ 300min, wherein, the soaking zone time is less than 60min；The tapping temperature of the strand is 1180 ~ 1220 DEG C.
- 7. manufacture method as claimed in claim 4, it is characterised in that the hot rolled plate is cooled down, including：Section cooling is carried out to the hot rolled plate；The section cooling uses leading portion rapid cooling pattern；The hot rolled plate is accurately cooled down.
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| CN106544586B (en) * | 2016-10-31 | 2018-01-23 | 首钢总公司 | A kind of effective low carbon low silicon hot-rolled coil of Pneumatic conveying and its manufacture method |
| CN106702273B (en) * | 2016-11-29 | 2019-04-09 | 武汉钢铁有限公司 | A kind of economical resistance to H2S corrodes normalizing pipe line steel and production method |
| CN110846553B (en) * | 2019-09-27 | 2021-11-19 | 邯郸钢铁集团有限责任公司 | Rich in H2Low-yield-ratio corrosion-resistant pipeline steel strip for S environment and production method thereof |
| CN112195409B (en) * | 2020-09-30 | 2022-04-19 | 首钢集团有限公司 | High-strength low-hardness hydrogen sulfide corrosion resistant steel and preparation method thereof |
| CN114921721B (en) * | 2022-04-27 | 2023-08-08 | 首钢集团有限公司 | Pipeline steel plate with excellent hydrogen induced cracking resistance and preparation method thereof |
| CN115287535B (en) * | 2022-07-14 | 2023-05-09 | 首钢集团有限公司 | Steel for hydrogen conveying pipeline and preparation method thereof |
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| EP2089556B1 (en) * | 2006-10-06 | 2019-05-01 | JFE Steel Corporation | Low yield ratio dual phase steel linepipe with superior strain aging resistance |
| CN102112643B (en) * | 2008-07-31 | 2013-11-06 | 杰富意钢铁株式会社 | Thick, high tensile-strength hot-rolled steel sheets with excellent low temperature toughness and manufacturing method therefor |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |