CN106119495B - A kind of manufacturing method of cold rolling medium high carbon structural steel - Google Patents

A kind of manufacturing method of cold rolling medium high carbon structural steel Download PDF

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CN106119495B
CN106119495B CN201610693925.8A CN201610693925A CN106119495B CN 106119495 B CN106119495 B CN 106119495B CN 201610693925 A CN201610693925 A CN 201610693925A CN 106119495 B CN106119495 B CN 106119495B
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cold rolling
manufacturing
strip
temperature
annealing
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CN106119495A (en
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蔡珍
毛新平
徐进桥
李国彬
汪水泽
何亚元
甘晓龙
孙宜强
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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

Abstract

The present invention discloses a kind of manufacturing method of cold rolling medium high carbon structural steel.The component and weight percent content of the cold rolling medium high carbon structural steel are C:0.30%-0.70%, Si:0.15%-0.35%, Mn:0.10%-1.20%, Cr:0.10%-1.10%, Alt≤0.030%, P≤0.020%, S≤0.010%, other addition alloying elements are no more than 0.3%, remaining is iron and inevitable impurity element.The manufacturing method is using primary annealing, once cold rolling, make raw material coil of strip that can directly carry out cold rolling by controlling hot-rolled process parameter, and cold rolling reduction ratio >=50%, ensure to deform and can penetrate into tissue core, keep the sheet carbide in hot rolling raw material pearlitic structrure cataclasm by cold-rolling deformation, and a large amount of dislocation is generated transgranular, cataclasm carbide and defect provides core for the precipitation of carbide in annealing process, obtain uniform tissue and tiny carbide, the technical effect for reaching improving production efficiency, reducing cost.

Description

A kind of manufacturing method of cold rolling medium high carbon structural steel
Technical field
The present invention relates to steel making technical field more particularly to a kind of manufacturing methods of cold rolling medium high carbon structural steel.
Background technique
Medium high carbon structural steel is widely used in the key industries such as machinery, automobile, new and high technology, and bullet can be manufactured after cold rolling The components such as spring, valve block, safe buckle, chain, this kind of product Surface Quality, ingredient structural homogenity, field trash etc. have It has higher requirements.
Prior art discloses a kind of " a kind of automobile cold-rolled diaphragm spring steel and its production method ", specifically disclose one The automobile cold-rolled diaphragm spring steel of kind and its production method, component and weight percent content are C:0.40-0.65%, Si: 0.15-0.35%, Mn:0.60-1.00%, P≤0.010%, S≤0.007%, Alt≤0.040%, Ni:0.20-0.50%, Cr:0.80-1.20%, V:0.27-0.55%, N≤0.005%, this method coiling temperature are 650-750 DEG C, are carried out after batching Annealing, first time annealing temperature are 700-840 DEG C, then carry out cold rolling, and first time cold rolling reduction ratio is 15-25%, for the second time Annealing temperature is 500-600 DEG C, and second of cold rolling reduction ratio is 10-20%, without annealing after second of cold rolling.The party Method is needed by twice annealing, and single cold rolling reduction ratio is lower, and deformation cannot permeate completely, and tissue is be easy to cause after annealing not Uniformly, plasticity and toughness are poor, and production efficiency is low, at high cost.
The prior art also discloses " the excellent high carbon steel sheet of heat treatment characteristic and its manufacturing method ", chemical component C: 0.3-1.0%, Mn:0.1-1.2%, Si≤0.4%, Al:0.01-0.1%, S≤0.010%, smart cooling velocity after rolling are 50-300 DEG C/s, final cooling temperature is 400-650 DEG C, and coiling temperature is 450-700 DEG C, first annealing operation is omitted, with >=30% Reduction ratio carries out cold rolling, then anneals.This method essence cooling velocity after rolling is too fast, is easy to produce thermal stress, unannealed straight The problems such as cold rolling easily causes fission, disconnected band is connect, lumber recovery is caused to reduce.
Summary of the invention
The application provides a kind of manufacturing method of cold rolling medium high carbon structural steel, solves and is needed in the prior art by twice Annealing, single cold rolling reduction ratio it is lower cause deformation cannot permeate completely, be easy to cause after annealing nonuniform organization, plasticity and toughness compared with The technical problem of difference, the technical effect for reaching improving production efficiency, reducing cost.
The application provides a kind of manufacturing method of cold rolling medium high carbon structural steel, the component of the cold rolling medium high carbon structural steel and Weight percent content is C:0.30%-0.70%, Si:0.15%-0.35%, Mn:0.10%-1.20%, Cr:0.10%- 1.10%, Alt≤0.030%, P≤0.020%, S≤0.010%, other addition alloying elements are no more than 0.3%, remaining is Iron and inevitable impurity element, the manufacturing method include:
Raw material coil of strip, the cold rolling reduction ratio are chosen according to the thickness of the cold rolling medium high carbon structural steel and cold rolling reduction ratio >=50%, the thickness range of the raw material coil of strip is 1.5mm-3.0mm, and the coil of strip is by carrying out finish rolling to slab and batching Afterwards, then slow cooling acquisition is carried out, wherein finish rolling finishing temperature is 860 DEG C -920 DEG C, and smart cooling velocity after rolling control is in 30 DEG C/s Hereinafter, coiling temperature is 680-730 DEG C；
After coil of strip expansion, pickling is carried out using hydrochloric acid, wherein the pickling temperature is 75 DEG C~85 DEG C, described Pickling speed is 15~45m/min, and the concentration of the hydrochloric acid is 6%~14%, molysite content≤110g/l in the hydrochloric acid；
Cold rolling is carried out to the coil of strip after pickling, first of reduction ratio≤25%, the second percentage pass reduction of the cold rolling is most Greatly, then successively decrease, every single pass reduction ratio >=10%, roll surface roughness Ra≤0.5 μm of the coil of strip after the completion of cold rolling；
It anneals to the coil of strip after the completion of cold rolling, obtains the cold rolling medium high carbon structural steel, wherein the annealing adds Hot temperature is A1- 50 DEG C~A1- 20 DEG C, and 10~30h is kept the temperature after heating, with the cooling velocity of≤20 DEG C/h after heat preservation It is cooled to 550 DEG C, is then cooled to 300 DEG C with 50~100 DEG C/h, then be cooled to 50 DEG C or less with 10~40 DEG C/h and come out of the stove, A1For raw material The pearlitic transformation temperature of coil of strip.
Preferably, the finish rolling finishing temperature is 900~920 DEG C, and smart cooling velocity after rolling control is in 20 DEG C/s hereinafter, volume Taking temperature is 700-730 DEG C.
Preferably, the pickling speed is 15~25m/min.
Preferably, single pass reduction ratio >=15%, into roll surface roughness Ra≤0.3 μ of the coil of strip after the completion of cold rolling m。
Preferably, the cooling velocity of the slow cooling is 10 DEG C/h~20 DEG C/h.
Preferably, the annealing specifically uses bell-type annealing.
Preferably, the protective gas when annealing is perhydro gas or nitrogen hydrogen mixeding gas, wherein place protective gas Ratio >=70% of middle hydrogen.
Preferably, in the protective gas of place hydrogen ratio >=90%.
Preferably, the heating temperature of the annealing is A1- 35 DEG C~A1- 20 DEG C, 15h~25h, heat preservation knot are kept the temperature after heating 550 DEG C or more of cooling velocity≤15 DEG C/h after beam.
The application has the beneficial effect that:
The manufacturing method of the cold rolling medium high carbon structural steel of the application compared with prior art, has the advantages that
1, the application makes hot rolling by technological parameters such as finishing temperature, cooling velocity, the coiling temperatures of control hot-rolled process Process obtain raw material coil of strip intensity it is lower, plasticity and toughness are more preferable, and structure property is more uniform, can direct cold rolling and bear 50% with On deflection, can effectively reduce annealing passage, reduce production cost, improve production efficiency.
2, it is insufficient directly to carry out annealing driving force for hot-rolled product, it is difficult to be formed uniform, carbide whole nodularization granular Carbide tissue, and hot-rolled product annealing can be such that ferrite and carbide plasticity enhances, and in cold-rolled process, carbide is difficult to Cataclasm, number of dislocations can also be reduced, and can weaken deformation to the facilitation of nodularization.The raw steel that the application obtains hot-rolled process Volume directly carries out cold rolling, keeps the sheet carbide in hot rolling raw material pearlitic structrure cataclasm by cold-rolling deformation, and transgranular Generate a large amount of dislocation, cataclasm carbide and defect provide core for the precipitation of carbide in annealing process, make carbide point Cloth disperse, tissue are more uniform.Cold rolling carries out the tissue contrast after spheroidizing after Fig. 1 and Fig. 2 is direct cold rolling and anneals.
3, the application controls single pass reduction ratio >=10% in cold-rolled process, cold rolling total reduction >=50%, it is ensured that becomes Shape can penetrate into tissue core, obtain uniform tissue and tiny carbide.
4, the application makes cold rolling by the protective gas of control bell type annealing furnace, cold rolling pass distribution and roll surface roughness Product surface is bright, roughness is low.
Therefore, by the manufacturing method of cold rolling medium high carbon structural steel provided by the present application, by using primary annealing, once Cold rolling and cold rolling reduction ratio >=50%, it is ensured that deformation can penetrate into tissue core, obtain uniform tissue and tiny carbide； Cold rolling is directly carried out by the raw material coil of strip for obtaining hot-rolled process, is made in hot rolling raw material pearlitic structrure by cold-rolling deformation Sheet carbide is cataclasm, and generates a large amount of dislocation transgranular, and cataclasm carbide and defect are carbide in annealing process Precipitation core is provided, make distribution of carbides disperse, tissue more uniformly, the medium high carbon structural steel produced using the application, pearl Body of light nodularization ratio can reach 95% or more, even tissue, and carbide is tiny, disperse, and intensity, hardness are lower, and plasticity and toughness are excellent, Surface-brightening and roughness is low can manufacture the components of high-precision, high-quality.
Compared with prior art, this method can effectively reduce annealing passage, shorten process flow, solve in the prior art Need it is lower by twice annealing, single cold rolling reduction ratio, cause deformation cannot permeate completely, tissue is be easy to cause after annealing not Uniformly, the poor technical problem of plasticity and toughness, the technical effect for reaching improving production efficiency, reducing cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some Embodiment.
Fig. 1 is the organizational topography that direct cold rolling carries out after spheroidizing in the prior art；
Fig. 2 is that cold rolling carries out the organizational topography after spheroidizing again after annealing；
A kind of Fig. 3 flow chart of the manufacturing method of cold rolling medium high carbon structural steel provided by the present application；
Fig. 4 is the organizational topography of the structural carbon steel 65Mn manufactured using the manufacturing method of the application；
Fig. 5 is the organizational topography of the structural alloy steel 42CrMo4 manufactured using the manufacturing method of the application；
Fig. 6 is the organizational topography of the structural carbon steel SAE1055 manufactured using the manufacturing method of the application；
Fig. 7 is the organizational topography of the structural alloy steel 30CrMo manufactured using the manufacturing method of the application.
Specific embodiment
By providing a kind of manufacturing method of cold rolling medium high carbon structural steel, solve needs the embodiment of the present application in the prior art It is lower by twice annealing, single cold rolling reduction ratio, cause deformation that cannot permeate completely, tissue odds are be easy to cause after annealing Technical problem even, plasticity and toughness are poor, the technical effect for reaching improving production efficiency, reducing cost.
Technical solution in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
A kind of manufacturing method of cold rolling medium high carbon structural steel, the component and weight percent of the cold rolling medium high carbon structural steel Content is C:0.30%-0.70%, Si:0.15%-0.35%, Mn:0.10%-1.20%, Cr:0.10%-1.10%, Alt ≤ 0.030%, P≤0.020%, S≤0.010%, other addition alloying elements are no more than 0.3%, remaining is iron and can not keep away The impurity element exempted from, which comprises
Raw material coil of strip, the cold rolling reduction ratio are chosen according to the thickness of the cold rolling medium high carbon structural steel and cold rolling reduction ratio >=50%, the thickness range of the raw material coil of strip is 1.5mm-3.0mm, and the coil of strip is by carrying out finish rolling to slab and batching Afterwards, then slow cooling acquisition is carried out, wherein finish rolling finishing temperature is 860 DEG C -920 DEG C, and smart cooling velocity after rolling control is in 30 DEG C/s Hereinafter, coiling temperature is 680-730 DEG C；
After coil of strip expansion, pickling is carried out using hydrochloric acid, wherein the pickling temperature is 75 DEG C~85 DEG C, described Pickling speed is 15~45m/min, and the concentration of the hydrochloric acid is 6%~14%, molysite content≤110g/l in the hydrochloric acid；
Cold rolling is carried out to the coil of strip after pickling, first of reduction ratio≤25%, the second percentage pass reduction of the cold rolling is most Greatly, then successively decrease, every single pass reduction ratio >=10%, roll surface roughness Ra≤0.5 μm of the coil of strip after the completion of cold rolling；
It anneals to the coil of strip after the completion of cold rolling, obtains the cold rolling medium high carbon structural steel, wherein the annealing adds Hot temperature is A1- 50 DEG C~A1- 20 DEG C, and 10~30h is kept the temperature after heating, with the cooling velocity of≤20 DEG C/h after heat preservation It is cooled to 550 DEG C, is then cooled to 300 DEG C with 50~100 DEG C/h, then be cooled to 50 DEG C or less with 10~40 DEG C/h and come out of the stove, A1For raw material The pearlitic transformation temperature of coil of strip.
Therefore, by the manufacturing method of cold rolling medium high carbon structural steel provided by the present application, by using primary annealing, once Cold rolling and cold rolling reduction ratio >=50% control smart cooling velocity after rolling in 20 DEG C/s or less, it is ensured that deformation can penetrate into tissue Core obtains uniform tissue and tiny carbide；Cold rolling is directly carried out by the raw material coil of strip for obtaining hot-rolled process, is led to Crossing cold-rolling deformation keeps the sheet carbide in hot rolling raw material pearlitic structrure cataclasm, and generates a large amount of dislocation transgranular, broken Disconnected carbide and defect provides core for the precipitation of carbide in annealing process, makes distribution of carbides disperse, organizes more equal It is even, solve need in the prior art it is lower by twice annealing, single cold rolling reduction ratio, cause deformation cannot permeate completely, The technical problem for be easy to causeing nonuniform organization, plasticity and toughness poor after annealing, the technology for reaching improving production efficiency, reducing cost Effect.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper Technical solution is stated to be described in detail.
It is lower by twice annealing, single cold rolling reduction ratio in order to solve to need in the prior art, cause deformation cannot be complete Full infiltration, the technical problem for be easy to causeing nonuniform organization, plasticity and toughness poor after annealing, reach improving production efficiency, reduce at This technical effect, the application provide a kind of manufacturing method of cold rolling medium high carbon structural steel.Lower medium and high carbon steel, industry are introduced first Steel by the weight percent hundred of carbon more than or equal to 0.25% is referred to as medium and high carbon steel.
The component and weight percent content of the cold rolling medium high carbon structural steel are C:0.30%-0.70%, Si: 0.15%-0.35%, Mn:0.10%-1.20%, Cr:0.10%-1.10%, Alt≤0.030%, P≤0.020%, S≤ 0.010%, other addition alloying elements are no more than 0.3%, remaining is iron and inevitable impurity element.
The manufacturing method of the cold rolling medium high carbon structural steel includes the following steps, as shown in Figure 3:
Step 110；Raw material coil of strip is chosen according to the thickness of the cold rolling medium high carbon structural steel and cold rolling reduction ratio, it is described cold Reduction ratio >=50% is rolled, the thickness range of the raw material coil of strip is 1.5mm-3.0mm, and the coil of strip is by carrying out essence to slab After rolling and batching, then carry out slow cooling acquisition, wherein finish rolling finishing temperature is 860 DEG C -920 DEG C, smart cooling velocity after rolling control In 30 DEG C/s hereinafter, coiling temperature is 680-730 DEG C；
Step 120；After coil of strip expansion, pickling is carried out to the coil of strip after expansion using hydrochloric acid, wherein the pickling Temperature is 75 DEG C~85 DEG C, and the pickling speed is 15~45m/min, and the concentration of the hydrochloric acid is 6%~14%, the hydrochloric acid Interior molysite content≤110g/l；
Step 130；Cold rolling, first of reduction ratio≤25%, the second passage of the cold rolling are carried out to the coil of strip after pickling Reduction ratio is maximum, then successively decreases, every single pass reduction ratio >=10%, roll surface roughness Ra≤0.5 μ of the coil of strip after the completion of cold rolling m；
Step 140；It anneals to the coil of strip after the completion of cold rolling, obtains the cold rolling medium high carbon structural steel.In this implementation In mode, bell-type annealing is specifically used, the heating temperature of the annealing is A1- 50 DEG C~A1- 20 DEG C, and 10 are kept the temperature after heating ~30h is cooled to 550 DEG C after heat preservation with the cooling velocity of≤20 DEG C/h, is then cooled to 300 DEG C with 50~100 DEG C/h, then with 10~40 DEG C/h is cooled to 50 DEG C or less and comes out of the stove.
Wherein, A1For the pearlitic transformation temperature of raw material coil of strip.Protective gas when annealing is that perhydro gas or nitrogen hydrogen are mixed Close gas, wherein ratio >=70% of hydrogen.
Specifically, the finish rolling finishing temperature is 900~920 DEG C, and smart cooling velocity after rolling control is in 20 DEG C/s hereinafter, volume Taking temperature is 700-730 DEG C, and the pickling speed is 15~25m/min, single pass reduction ratio >=15%, into after the completion of cold rolling Roll surface roughness Ra≤0.3 μm of coil of strip.
In addition, the heating temperature of the annealing is A1- 35 DEG C~A1- 20 DEG C, 15h~25h is kept the temperature after heating, heat preservation terminates 550 DEG C or more of cooling velocity≤15 DEG C/h afterwards, in addition, in the protective gas, ratio >=90% of hydrogen.
The manufacturing method of the cold rolling medium high carbon structural steel of the application compared with prior art, has the advantages that
1, the application makes hot rolling by technological parameters such as finishing temperature, cooling velocity, the coiling temperatures of control hot-rolled process Process obtain raw material coil of strip intensity it is lower, plasticity and toughness are more preferable, and structure property is more uniform, can direct cold rolling and bear 50% with On deflection, can effectively reduce annealing passage, reduce production cost, improve production efficiency.
2, it is insufficient directly to carry out annealing driving force for hot-rolled product, it is difficult to be formed uniform, carbide whole nodularization granular Carbide tissue, and hot-rolled product annealing can be such that ferrite and carbide plasticity enhances, and in cold-rolled process, carbide is difficult to Cataclasm, number of dislocations can also be reduced, and can weaken deformation to the facilitation of nodularization.The raw steel that the application obtains hot-rolled process Volume directly carries out cold rolling, keeps the sheet carbide in hot rolling raw material pearlitic structrure cataclasm by cold-rolling deformation, and transgranular Generate a large amount of dislocation, cataclasm carbide and defect provide core for the precipitation of carbide in annealing process, make carbide point Cloth disperse, tissue are more uniform.Cold rolling carries out the tissue contrast after spheroidizing after Fig. 1 and Fig. 2 is direct cold rolling and anneals.
3, the application controls single pass reduction ratio >=10% in cold-rolled process, cold rolling total reduction >=50%, it is ensured that becomes Shape can penetrate into tissue core, obtain uniform tissue and tiny carbide.
4, the application makes cold rolling by the protective gas of control bell type annealing furnace, cold rolling pass distribution and roll surface roughness Product surface is bright, roughness is low.
Therefore, by the manufacturing method of cold rolling medium high carbon structural steel provided by the present application, by using primary annealing, once Cold rolling and cold rolling reduction ratio >=50%, it is ensured that deformation can penetrate into tissue core, obtain uniform tissue and tiny carbide； Cold rolling is directly carried out by the raw material coil of strip for obtaining hot-rolled process, is made in hot rolling raw material pearlitic structrure by cold-rolling deformation Sheet carbide is cataclasm, and generates a large amount of dislocation transgranular, and cataclasm carbide and defect are carbide in annealing process Precipitation core is provided, make distribution of carbides disperse, tissue more uniformly, the medium high carbon structural steel produced using the application, pearl Body of light nodularization ratio can reach 95% or more, even tissue, and carbide is tiny, disperse, and intensity, hardness are lower, and plasticity and toughness are excellent, Surface-brightening and roughness is low can manufacture the components of high-precision, high-quality.
Compared with prior art, this method can effectively reduce annealing passage, shorten process flow, solve in the prior art Need it is lower by twice annealing, single cold rolling reduction ratio, cause deformation cannot permeate completely, tissue is be easy to cause after annealing not Uniformly, the poor technical problem of plasticity and toughness, the technical effect for reaching improving production efficiency, reducing cost.
Example is illustrated below:
Example 1
This example with a thickness of the cold rolling structural carbon steel 65Mn of 0.8mm manufacturing method, cold rolling structural carbon steel 65Mn's Component and weight percent content are C:0.70%, Si:0.27%, Mn:1.20%, P:0.012%, S:0.001%, Alt: 0.021%, remaining is Fe and inevitable impurity.
According to the cold rolling structural carbon steel 65Mn with a thickness of 0.8mm, the raw material coil of strip with a thickness of 2.0mm is chosen, finish rolling is whole Rolling temperature is 920 DEG C, and cold rolling speed is 30 DEG C/s after finish rolling, and coiling temperature is 730 DEG C, subsequent steel coils packing slow cooling.
85 DEG C of pickling temperature, the concentration of the hydrochloric acid is 12%, and the molysite content in the hydrochloric acid is 105g/l, the acid Washing speed is 15m/min.
As shown in table 1, the last one passage roll surface roughness Ra is 0.5 μm for cold rolling pass distribution.
The distribution of 1 cold rolling pass of table
First passage Second passage Third passage Four-pass
21% 30% 18% 13.8%
The A of cold rolling structural carbon steel 65Mn1Temperature is 720 DEG C, and 700 DEG C of heating temperature, soaking time 10h, heat preservation is tied It is cooled to 550 DEG C after beam with the speed of 20 DEG C/h, is then cooled to 300 DEG C with 50 DEG C/h, then be cooled to 45 DEG C with 40 DEG C/h, when annealing adopts With perhydro gas shielded gas.
The microstructure of this example is shown in Fig. 4, and performance is shown in Table 2, and product surface roughness is 0.52 μm.
The performance of structural carbon steel 65Mn in 2 example 1 of table
Example 2
Manufacturing method of this example with a thickness of the cold rolling structural alloy steel 42CrMo4 of 1.5mm, cold rolling structural alloy steel The component and weight percent content of 42CrMo4 is C:0.39wt.%, Si:0.22wt.%, Mn:0.77wt.%, P: 0.012wt.%, S:0.003wt.%, Alt:0.030%, Cr:1.1%, Mo:0.17%, remaining for Fe and inevitably it is miscellaneous Matter.
According to the cold rolling structural alloy steel 42CrMo4 with a thickness of 1.5mm, the raw material coil of strip with a thickness of 3.0mm, finish rolling are chosen Finishing temperature is 860 DEG C, and cold rolling speed is 18 DEG C/s after finish rolling, and coiling temperature is 680 DEG C, subsequent steel coils packing slow cooling.
75 DEG C of pickling temperature, the concentration of the hydrochloric acid is 6%, and the molysite content in the hydrochloric acid is 110g/l, the acid Washing speed is 30m/min.
As shown in table 3, the last one passage roll surface roughness Ra is 0.38 μm for cold rolling pass distribution.
The distribution of 3 cold rolling pass of table
First passage Second passage Third passage
19% 29% 13%
The A of cold rolling structural alloy steel 42CrMo41Temperature is 738 DEG C, 703 DEG C of heating temperature, soaking time 30h, is kept the temperature After with the speed of 15 DEG C/h be cooled to 550 DEG C, be then cooled to 300 DEG C with 100 DEG C/h, then be cooled to 50 DEG C with 30 DEG C/h, annealing When protective gas use nitrogen hydrogen mixeding gas, wherein hydrogen ratio 70%.
The microstructure of this example is shown in Fig. 5, and performance is shown in Table 4, and product surface roughness is 0.365 μm.
The performance of 4 example of table, 2 medium alloy constructional steel 42CrMo4
Example 3
Manufacturing method of this example with a thickness of the cold rolling structural carbon steel SAE1055 of 1.0mm, cold rolling structural carbon steel SAE1055 chemical component is C:0.55wt.%, Si:0.35wt.%, Mn:0.90wt.%, P:0.010wt.%, S: 0.006wt.%, Alt:0.025%, Cr:0.10%, remaining is Fe and inevitable impurity.
According to the cold rolling structural carbon steel SAE1055 with a thickness of 1.0mm, choose with a thickness of 2.5mm raw material coil of strip, finish rolling is whole Rolling temperature is 912 DEG C, and cold rolling speed is 24 DEG C/s after finish rolling, and coiling temperature is 700 DEG C, subsequent steel coils packing slow cooling.
81 DEG C of pickling temperature, the concentration of the hydrochloric acid is 11%, and the molysite content in the hydrochloric acid is 95g/l, the acid Washing speed is 21m/min.
As shown in table 5, the last one passage roll surface roughness Ra is 0.42 μm for cold rolling pass distribution.
The distribution of 5 cold rolling pass of table
First passage Second passage Third passage
25% 31% 23%
The A of cold rolling structural carbon steel SAE10551Temperature is 727 DEG C, 677 DEG C of heating temperature, soaking time 21h, is kept the temperature After with the speed of 17 DEG C/h be cooled to 550 DEG C, be then cooled to 300 DEG C with 80 DEG C/h, then be cooled to 50 DEG C with 37 DEG C/h, when annealing Protective gas use nitrogen hydrogen mixeding gas, wherein hydrogen ratio be 80%.
The microstructure of this example is shown in Fig. 6, and performance is shown in Table 6, and product surface roughness is 0.412 μm.
The performance of structural carbon steel SAE1055 in 6 example 3 of table
Example 4
Manufacturing method of this example with a thickness of the cold rolling structural alloy steel 30CrMo of 1.2mm, cold rolling structural alloy steel 30CrMo chemical component is C:0.30wt.%, Si:0.19wt.%, Mn:0.56wt.%, P:0.015wt.%, S: 0.008wt.%, Alt:0.020%, Cr:1.0%, Mo:0.19%, remaining is Fe and inevitable impurity.
According to the cold rolling structural alloy steel 30CrMo with a thickness of 1.2mm, the raw material coil of strip with a thickness of 2.7mm, finish rolling are chosen Finishing temperature is 896 DEG C, and cold rolling speed is 16 DEG C/s after finish rolling, and coiling temperature is 710 DEG C, subsequent steel coils packing slow cooling.
78 DEG C of pickling temperature, the concentration of the hydrochloric acid is 8%, and the molysite content in the hydrochloric acid is 103g/l, the acid Washing speed is 45m/min.
As shown in table 7, the last one passage roll surface roughness Ra is 0.37 μm for cold rolling pass distribution.
The distribution of 7 cold rolling pass of table
First passage Second passage Third passage Four-pass
18% 24% 17% 14%
The A of cold rolling structural alloy steel 30CrMo1Temperature is 740 DEG C, 715 DEG C of heating temperature, soaking time 23h, is kept the temperature After with the speed of 15 DEG C/h be cooled to 550 DEG C, be then cooled to 300 DEG C with 67 DEG C/h, then be cooled to 50 DEG C with 22 DEG C/h, when annealing Protective gas use nitrogen hydrogen mixeding gas, wherein hydrogen ratio be 90%.
The microstructure of this example is shown in Fig. 7, and performance is shown in Table 8, and product surface roughness is 0.381 μm.
The performance of 8 example of table, 4 medium alloy constructional steel 30CrMo
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (9)

1. a kind of manufacturing method of cold rolling medium high carbon structural steel, which is characterized in that the component of the cold rolling medium high carbon structural steel and Weight percent content is C:0.30%-0.70%, Si:0.15%-0.35%, Mn:0.10%-1.20%, Cr:1.0%- 1.10%, Alt≤0.030%, P≤0.020%, S≤0.010%, other addition alloying elements are no more than 0.3%, remaining is Iron and inevitable impurity element, the manufacturing method include:
Raw material coil of strip is chosen according to the thickness of the cold rolling medium high carbon structural steel and cold rolling reduction ratio, the cold rolling reduction ratio >= 50%, the thickness range of the raw material coil of strip is 1.5mm-3.0mm, and the coil of strip is by carrying out finish rolling to slab and batching Afterwards, then slow cooling acquisition is carried out, wherein finish rolling finishing temperature is 860 DEG C -920 DEG C, and smart cooling velocity after rolling control is in 30 DEG C/s Hereinafter, coiling temperature is 700-730 DEG C；
After coil of strip expansion, pickling is carried out using hydrochloric acid, wherein the pickling temperature is 75 DEG C~85 DEG C, the pickling Speed is 15~45m/min, and the concentration of the hydrochloric acid is 6%~14%, molysite content≤110g/l in the hydrochloric acid；
Cold rolling is carried out to the coil of strip after pickling, first of reduction ratio≤25%, the second percentage pass reduction of the cold rolling is maximum, with After successively decrease, every single pass reduction ratio >=10%, roll surface roughness Ra≤0.5 μm of the coil of strip after the completion of cold rolling；
It anneals to the coil of strip after the completion of cold rolling, obtains the cold rolling medium high carbon structural steel, wherein the heating temperature of the annealing Degree is A1- 50 DEG C~A1- 20 DEG C, and 10~30h is kept the temperature after heating, it is cooled to after heat preservation with the cooling velocity of≤20 DEG C/h 550 DEG C, then it is cooled to 300 DEG C with 50~100 DEG C/h, then be cooled to 50 DEG C or less with 10~40 DEG C/h and come out of the stove, A1For raw material coil of strip Pearlitic transformation temperature.
2. manufacturing method as described in claim 1, which is characterized in that the finish rolling finishing temperature is 900~920 DEG C, finish rolling Cooling velocity control is in 20 DEG C/s hereinafter, coiling temperature is 700-730 DEG C afterwards.
3. manufacturing method as described in claim 1, which is characterized in that the pickling speed is 15~25m/min.
4. manufacturing method as described in claim 1, which is characterized in that single pass reduction ratio >=15% is completed into cold rolling Roll surface roughness Ra≤0.3 μm of coil of strip afterwards.
5. manufacturing method as described in claim 1, which is characterized in that the cooling velocity of the slow cooling be 10 DEG C/h~20 DEG C/ h。
6. manufacturing method as described in claim 1, which is characterized in that the annealing specifically uses bell-type annealing.
7. manufacturing method as described in claim 1, which is characterized in that the protective gas when annealing is perhydro gas or nitrogen Hydrogen mixed gas, wherein ratio >=70% of hydrogen in the protective gas of place.
8. manufacturing method as claimed in claim 7, which is characterized in that ratio >=90% of hydrogen in the protective gas of place.
9. the manufacturing method as described in any claim in claim 1-8, which is characterized in that the heating temperature of the annealing For A1- 35 DEG C~A1- 20 DEG C, 15h~25h, 550 DEG C or more of cooling velocity≤15 DEG C/h after heat preservation are kept the temperature after heating.
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139654A (en) * 1980-03-31 1981-10-31 Kawasaki Steel Corp High-tensile cold-rolled steel plate with superior formability and its manufacture
JPH06240364A (en) * 1993-02-19 1994-08-30 Kobe Steel Ltd Production of high strength cold rolled steel sheet excellent in workability
CN1661127A (en) * 2004-02-25 2005-08-31 杰富意钢铁株式会社 High strength cold rolled steel sheet and method for manufacturing the same
CN102031455A (en) * 2009-09-30 2011-04-27 鞍钢股份有限公司 Steel plate for stamping and quenching and manufacturing method thereof
CN102264933A (en) * 2008-12-24 2011-11-30 Posco公司 High carbon steel sheet with superior heat treatment characteristics, and manufacturing method thereof
CN102943214A (en) * 2012-11-16 2013-02-27 武汉钢铁(集团)公司 Automotive cold-rolled diaphragm spring steel and production method thereof
CN103764862A (en) * 2011-09-09 2014-04-30 新日铁住金株式会社 Medium carbon steel sheet, quenched member, and method for manufacturing medium carbon steel sheet and quenched member
CN103966409A (en) * 2013-01-31 2014-08-06 宝钢不锈钢有限公司 Manufacturing method for medium chrome ferrite stainless steel
JP2015175004A (en) * 2014-03-13 2015-10-05 Ｊｆｅスチール株式会社 Production method of high strength steel sheet excellent in formability

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139654A (en) * 1980-03-31 1981-10-31 Kawasaki Steel Corp High-tensile cold-rolled steel plate with superior formability and its manufacture
JPH06240364A (en) * 1993-02-19 1994-08-30 Kobe Steel Ltd Production of high strength cold rolled steel sheet excellent in workability
CN1661127A (en) * 2004-02-25 2005-08-31 杰富意钢铁株式会社 High strength cold rolled steel sheet and method for manufacturing the same
CN102264933A (en) * 2008-12-24 2011-11-30 Posco公司 High carbon steel sheet with superior heat treatment characteristics, and manufacturing method thereof
CN102031455A (en) * 2009-09-30 2011-04-27 鞍钢股份有限公司 Steel plate for stamping and quenching and manufacturing method thereof
CN103764862A (en) * 2011-09-09 2014-04-30 新日铁住金株式会社 Medium carbon steel sheet, quenched member, and method for manufacturing medium carbon steel sheet and quenched member
CN102943214A (en) * 2012-11-16 2013-02-27 武汉钢铁(集团)公司 Automotive cold-rolled diaphragm spring steel and production method thereof
CN103966409A (en) * 2013-01-31 2014-08-06 宝钢不锈钢有限公司 Manufacturing method for medium chrome ferrite stainless steel
JP2015175004A (en) * 2014-03-13 2015-10-05 Ｊｆｅスチール株式会社 Production method of high strength steel sheet excellent in formability

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