CN106119495A - A kind of manufacture method of cold rolling medium high carbon structural steel - Google Patents

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

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CN106119495A
CN106119495A CN201610693925.8A CN201610693925A CN106119495A CN 106119495 A CN106119495 A CN 106119495A CN 201610693925 A CN201610693925 A CN 201610693925A CN 106119495 A CN106119495 A CN 106119495A
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cold rolling
manufacture method
strip
coil
annealing
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CN106119495B (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 Corp
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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

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The present invention discloses the manufacture method of a kind of cold rolling medium high carbon structural steel.Component and the weight percent content of described 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 adds alloying element and is less than 0.3%, and remaining is ferrum and inevitable impurity element.Described manufacture method uses once annealing, once cold rolling, raw material coil of strip is made directly to carry out by control hot-rolled process parameter cold rolling, and cold rolling reduction ratio >=50%, guarantee that deformation energy penetrates into tissue core, cataclasm by the cold roller and deformed sheet carbide made in hot rolling raw material pearlitic structrure, and produce substantial amounts of dislocation at intracrystalline, cataclasm carbide and defect provide core for the precipitation of carbide in annealing process, obtain uniform tissue and tiny carbide, reach improving production efficiency, the technique effect of reduction cost.

Description

A kind of manufacture method of cold rolling medium high carbon structural steel
Technical field
The present invention relates to steel making technical field, particularly relate to the manufacture method of a kind of cold rolling medium high carbon structural steel.
Background technology
Medium high carbon structural steel is widely used in the key industries such as machinery, automobile, new and high technology, can manufacture bullet after cold rolling The parts such as spring, valve block, buckle of safety belt, chain, this series products Surface Quality, composition structural homogenity, field trash etc. all have Have higher requirements.
Prior art discloses one " a kind of automobile cold-rolled diaphragm spring steel and production method thereof ", specifically disclose one Plant automobile cold-rolled diaphragm spring steel and production method, its component and weight percent content be 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%, the method coiling temperature is 650-750 DEG C, carries out after batching Annealing, annealing temperature is 700-840 DEG C for the first time, carries out cold rolling subsequently, and the most cold rolling reduction ratio is 15-25%, for the second time Annealing temperature is 500-600 DEG C, and the most cold rolling reduction ratio is 10-20%, does not anneals after the most cold rolling end.The party Method needs through twice annealing, and the cold rolling reduction ratio of single is relatively low, and deformation can not be permeated completely, easily causes tissue not after annealing Uniformly, plasticity and toughness poor, and production efficiency is low, cost is high.
Prior art also discloses " high carbon steel sheet of heat treatment characteristic excellence and manufacture method thereof ", and chemical composition is C: 0.3-1.0%, Mn:0.1-1.2%, Si≤0.4%, Al:0.01-0.1%, S≤0.010%, its essence cooling velocity after rolling is 50-300 DEG C/s, final cooling temperature is 400-650 DEG C, and coiling temperature is 450-700 DEG C, omits first annealing operation, with >=30% Reduction ratio carries out cold rolling, anneals subsequently.The method essence cooling velocity after rolling is too fast, easily produces thermal stress, unannealed directly Connect and cold rolling easily cause the problems such as fission, broken belt, cause lumber recovery to reduce.
Summary of the invention
The application provides the manufacture method of a kind of cold rolling medium high carbon structural steel, solves and needs in prior art through twice Annealing, the cold rolling reduction ratio of single is relatively low causes deformation not permeate completely, easily causes uneven microstructure, plasticity and toughness relatively after annealing The technical problem of difference, reaches improving production efficiency, the technique effect of reduction cost.
The application provides the manufacture method of a kind of cold rolling medium high carbon structural steel, the component of described 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 interpolation alloying element is less than 0.3%, and remaining is Ferrum and inevitable impurity element, described manufacture method includes:
Thickness and cold rolling reduction ratio according to described cold rolling medium high carbon structural steel choose raw material coil of strip, described cold rolling reduction ratio >=50%, the thickness range of described raw material coil of strip is 1.5mm-3.0mm, and described coil of strip is by strand being carried out finish rolling and batching After, then carry out slow cooling acquisition, wherein, finish rolling finishing temperature is 860 DEG C-920 DEG C, and essence cooling velocity after rolling controls at 30 DEG C/s Hereinafter, coiling temperature is 680-730 DEG C；
After being launched by described coil of strip, using hydrochloric acid to carry out pickling, wherein, described pickling temperature is 75 DEG C～85 DEG C, described Pickling speed is 15～45m/min, and the concentration of described hydrochloric acid is 6%～14%, the iron salt content≤110g/l in described hydrochloric acid；
Carrying out cold rolling to the coil of strip after pickling, described cold rolling first reduction ratio≤25%, the second percentage pass reduction is Greatly, successively decrease subsequently, every single pass reduction ratio >=10%, cold rolling complete after roll surface roughness Ra≤0.5 μm of coil of strip；
Coil of strip after cold rolling completing is annealed, it is thus achieved that described cold rolling medium high carbon structural steel, wherein, adding of described annealing Hot temperature is A1-50 DEG C～A1It is incubated 10～30h after-20 DEG C, and heating, is incubated the rate of cooling with≤20 DEG C/h after terminating It is cooled to 550 DEG C, is cooled to 300 DEG C with 50～100 DEG C/h subsequently, then be cooled to less than 50 DEG C with 10～40 DEG C/h and come out of the stove, A1For raw material The pearlitic transformation temperature of coil of strip.
Preferably, described finish rolling finishing temperature is 900～920 DEG C, and essence cooling velocity after rolling controls at 20 DEG C/below s, volume Take temperature and be 700-730 DEG C.
Preferably, described pickling speed is 15～25m/min.
Preferably, described single pass reduction ratio >=15%, enters roll surface roughness Ra≤0.3 μ of the coil of strip after cold rolling completing m。
Preferably, the rate of cooling of described slow cooling is 10 DEG C/h～20 DEG C/h.
Preferably, described annealing specifically uses bell-type annealing.
Preferably, protective gas during described annealing is perhydro gas or nitrogen hydrogen mixeding gas, wherein, and place protective gas Ratio >=70% of middle hydrogen.
Preferably, ratio >=90% of hydrogen in the protective gas of place.
Preferably, the heating-up temperature of described annealing is A1-35 DEG C～A1-20 DEG C, after heating, it is incubated 15h～25h, insulation knot Restraint the rate of cooling≤15 DEG C/h of latter more than 550 DEG C.
The application has the beneficial effect that:
The manufacture method of the cold rolling medium high carbon structural steel of the application compared with prior art, has the advantages that
1, the application is by controlling the technological parameters such as the finishing temperature of hot-rolled process, rate of cooling, coiling temperature, makes hot rolling The raw material coil of strip intensity that operation obtains is lower, and plasticity and toughness are more preferable, and structure property is more uniformly distributed, can direct cold rolling and bear 50% with On deflection, can effectively reduce annealing passage, reduce production cost, improve production efficiency.
2, the hot-rolled product driving force that directly carries out annealing is not enough, it is difficult to form the granular of uniform, the whole nodularization of carbide Carbide tissue, and hot-rolled product annealing can make ferrite and carbide plasticity strengthen, and in cold-rolled process, carbide is difficult to Cataclasm, number of dislocations also can reduce, and can weaken the deformation facilitation to nodularization.The raw steel that hot-rolled process is obtained by the application Volume directly carries out cold rolling, cataclasm by the cold roller and deformed sheet carbide made in hot rolling raw material pearlitic structrure, and at intracrystalline Produce substantial amounts of dislocation, cataclasm carbide and defect and provide core for the precipitation of carbide in annealing process, make carbide divide Cloth disperse, tissue is more uniformly distributed.Fig. 1 and Fig. 2 is cold rolling after direct cold rolling and annealing to carry out the tissue contrast after spheroidizing.
3, single pass reduction ratio >=10% during the application controls cold-rolled process, cold rolling total reduction >=50%, it is ensured that become Shape can penetrate tissue core, it is thus achieved that uniform tissue and tiny carbide.
4, the application is by controlling the protective gas of bell type annealing furnace, cold rolling pass distribution and roll surface roughness, makes cold rolling Product surface light, roughness are low.
Therefore, by the manufacture method of the cold rolling medium high carbon structural steel that the application provides, once anneal, once by using Cold rolling and cold rolling reduction ratio >=50%, it is ensured that deformation energy penetrates into tissue core, it is thus achieved that uniform tissue and tiny carbide； Directly carry out cold rolling by the raw material coil of strip that hot-rolled process is obtained, made in hot rolling raw material pearlitic structrure by cold roller and deformed Sheet carbide is cataclasm, and produces substantial amounts of dislocation at intracrystalline, and cataclasm carbide and defect are carbide in annealing process Precipitation provide core, make distribution of carbides disperse, tissue is more uniformly distributed, use the application produce medium high carbon structural steel, pearl Body of light nodularization ratio can reach more than 95%, even tissue, and carbide is tiny, disperse, and intensity, hardness are relatively low, and plasticity and toughness are excellent, Surface-brightening and roughness are low, can manufacture high accuracy, the parts of high-quality.
Compared with prior art, the method can effectively reduce annealing passage, shortened process, solves in prior art Need through twice annealing, the cold rolling reduction ratio of single relatively low, cause deformation not permeate completely, easily cause tissue after annealing not Uniformly, the poor technical problem of plasticity and toughness, reach improving production efficiency, reduce the technique effect of cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is only some of the present invention Embodiment.
Fig. 1 is the tissue topography's figure after direct cold rolling carries out spheroidizing in prior art；
Fig. 2 is cold rolling after annealing to carry out the figure of the tissue topography after spheroidizing again；
The flow chart of the manufacture method of a kind of cold rolling medium high carbon structural steel that Fig. 3 the application provides；
Fig. 4 is tissue topography's figure of the carbon structural steels 65Mn using the manufacture method of the application to manufacture；
Fig. 5 is tissue topography's figure of the structural alloy steel 42CrMo4 using the manufacture method of the application to manufacture；
Fig. 6 is tissue topography's figure of the carbon structural steels SAE1055 using the manufacture method of the application to manufacture；
Fig. 7 is tissue topography's figure of the structural alloy steel 30CrMo using the manufacture method of the application to manufacture.
Detailed description of the invention
The embodiment of the present application, by providing the manufacture method of a kind of cold rolling medium high carbon structural steel, solves in prior art and needs Relatively low through twice annealing, the cold rolling reduction ratio of single, cause deformation not permeate completely, after annealing, easily cause tissue odds The technical problem that even, plasticity and toughness are poor, reaches improving production efficiency, the technique effect of reduction cost.
Technical scheme in the embodiment of the present application is for solving above-mentioned technical problem, and general thought is as follows:
A kind of manufacture method of cold rolling medium high carbon structural steel, the component of described cold rolling medium high carbon structural steel and percentage by weight 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 interpolation alloying element is less than 0.3%, and remaining is for ferrum and can not keep away The impurity element exempted from, described method includes:
Thickness and cold rolling reduction ratio according to described cold rolling medium high carbon structural steel choose raw material coil of strip, described cold rolling reduction ratio >=50%, the thickness range of described raw material coil of strip is 1.5mm-3.0mm, and described coil of strip is by strand being carried out finish rolling and batching After, then carry out slow cooling acquisition, wherein, finish rolling finishing temperature is 860 DEG C-920 DEG C, and essence cooling velocity after rolling controls at 30 DEG C/s Hereinafter, coiling temperature is 680-730 DEG C；
After being launched by described coil of strip, using hydrochloric acid to carry out pickling, wherein, described pickling temperature is 75 DEG C～85 DEG C, described Pickling speed is 15～45m/min, and the concentration of described hydrochloric acid is 6%～14%, the iron salt content≤110g/l in described hydrochloric acid；
Carrying out cold rolling to the coil of strip after pickling, described cold rolling first reduction ratio≤25%, the second percentage pass reduction is Greatly, successively decrease subsequently, every single pass reduction ratio >=10%, cold rolling complete after roll surface roughness Ra≤0.5 μm of coil of strip；
Coil of strip after cold rolling completing is annealed, it is thus achieved that described cold rolling medium high carbon structural steel, wherein, adding of described annealing Hot temperature is A1-50 DEG C～A1It is incubated 10～30h after-20 DEG C, and heating, is incubated the rate of cooling with≤20 DEG C/h after terminating It is cooled to 550 DEG C, is cooled to 300 DEG C with 50～100 DEG C/h subsequently, then be cooled to less than 50 DEG C 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 manufacture method of the cold rolling medium high carbon structural steel that the application provides, once anneal, once by using Cold rolling and cold rolling reduction ratio >=50%, essence cooling velocity after rolling is controlled at 20 DEG C/below s, it is ensured that deformation energy penetrates into tissue Core, it is thus achieved that uniform tissue and tiny carbide；Directly carry out cold rolling by the raw material coil of strip that hot-rolled process is obtained, logical Cross the cold roller and deformed sheet carbide made in hot rolling raw material pearlitic structrure cataclasm, and produce substantial amounts of dislocation at intracrystalline, broken Disconnected carbide and defect provide core for the precipitation of carbide in annealing process, make distribution of carbides disperse, organize the most equal Even, solving needs through twice annealing, the cold rolling reduction ratio of single relatively low in prior art, cause deformation not permeate completely, Easily cause the technical problem that uneven microstructure, plasticity and toughness are poor after annealing, reach improving production efficiency, reduce the technology of cost Effect.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment to upper State technical scheme to be described in detail.
Relatively low in order to solve prior art needs through twice annealing, the cold rolling reduction ratio of single, cause the deformation can not be complete Full infiltration, easily causes the technical problem that uneven microstructure, plasticity and toughness are poor, reaches improving production efficiency, reduces into after annealing This technique effect, the application provides the manufacture method of a kind of cold rolling medium high carbon structural steel.First lower medium and high carbon steel, industry are introduced The weight percent hundred of the carbon steel more than or equal to 0.25% is referred to as medium and high carbon steel.
Component and the weight percent content of described 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 adds alloying element and is less than 0.3%, and remaining is ferrum and inevitable impurity element.
The manufacture method of described cold rolling medium high carbon structural steel comprises the following steps, as shown in Figure 3:
Step 110；Thickness and cold rolling reduction ratio according to described cold rolling medium high carbon structural steel choose raw material coil of strip, described cold Rolling reduction ratio >=50%, the thickness range of described raw material coil of strip is 1.5mm-3.0mm, and described coil of strip is by strand is carried out essence After rolling and batching, then carrying out slow cooling acquisition, wherein, finish rolling finishing temperature is 860 DEG C-920 DEG C, and essence cooling velocity after rolling controls At 30 DEG C/below s, coiling temperature is 680-730 DEG C；
Step 120；After being launched by described coil of strip, use hydrochloric acid that the coil of strip after launching is carried out pickling, wherein, described pickling Temperature is 75 DEG C～85 DEG C, and described pickling speed is 15～45m/min, and the concentration of described hydrochloric acid is 6%～14%, described hydrochloric acid Interior iron salt content≤110g/l；
Step 130；Coil of strip after pickling is carried out cold rolling, described cold rolling first reduction ratio≤25%, the second passage Reduction ratio is maximum, successively decreases subsequently, every single pass reduction ratio >=10%, cold rolling complete after roll surface roughness Ra≤0.5 μ of coil of strip m；
Step 140；Coil of strip after cold rolling completing is annealed, it is thus achieved that described cold rolling medium high carbon structural steel.In this enforcement In mode, specifically using bell-type annealing, the heating-up temperature of described annealing is A1-50 DEG C～A110 it are incubated after-20 DEG C, and heating ～30h, insulation is cooled to 550 DEG C with the rate of cooling of≤20 DEG C/h after terminating, is cooled to 300 DEG C with 50～100 DEG C/h subsequently, then with 10～40 DEG C/h is cooled to less than 50 DEG C and comes out of the stove.
Wherein, A1Pearlitic transformation temperature for raw material coil of strip.Protective gas during annealing is that perhydro gas or nitrogen hydrogen mix Close gas, wherein, ratio >=70% of hydrogen.
Specifically, described finish rolling finishing temperature is 900～920 DEG C, and essence cooling velocity after rolling controls at 20 DEG C/below s, volume Taking temperature and be 700-730 DEG C, described pickling speed is 15～25m/min, single pass reduction ratio >=15%, after entering cold rolling completing Roll surface roughness Ra≤0.3 μm of coil of strip.
It addition, the heating-up temperature of described annealing is A1-35 DEG C～A1-20 DEG C, being incubated 15h～25h after heating, insulation terminates Rate of cooling≤15 DEG C of latter more than 550 DEG C/h, it addition, in described protective gas, ratio >=90% of hydrogen.
The manufacture method of the cold rolling medium high carbon structural steel of the application compared with prior art, has the advantages that
1, the application is by controlling the technological parameters such as the finishing temperature of hot-rolled process, rate of cooling, coiling temperature, makes hot rolling The raw material coil of strip intensity that operation obtains is lower, and plasticity and toughness are more preferable, and structure property is more uniformly distributed, can direct cold rolling and bear 50% with On deflection, can effectively reduce annealing passage, reduce production cost, improve production efficiency.
2, the hot-rolled product driving force that directly carries out annealing is not enough, it is difficult to form the granular of uniform, the whole nodularization of carbide Carbide tissue, and hot-rolled product annealing can make ferrite and carbide plasticity strengthen, and in cold-rolled process, carbide is difficult to Cataclasm, number of dislocations also can reduce, and can weaken the deformation facilitation to nodularization.The raw steel that hot-rolled process is obtained by the application Volume directly carries out cold rolling, cataclasm by the cold roller and deformed sheet carbide made in hot rolling raw material pearlitic structrure, and at intracrystalline Produce substantial amounts of dislocation, cataclasm carbide and defect and provide core for the precipitation of carbide in annealing process, make carbide divide Cloth disperse, tissue is more uniformly distributed.Fig. 1 and Fig. 2 is cold rolling after direct cold rolling and annealing to carry out the tissue contrast after spheroidizing.
3, single pass reduction ratio >=10% during the application controls cold-rolled process, cold rolling total reduction >=50%, it is ensured that become Shape can penetrate tissue core, it is thus achieved that uniform tissue and tiny carbide.
4, the application is by controlling the protective gas of bell type annealing furnace, cold rolling pass distribution and roll surface roughness, makes cold rolling Product surface light, roughness are low.
Therefore, by the manufacture method of the cold rolling medium high carbon structural steel that the application provides, once anneal, once by using Cold rolling and cold rolling reduction ratio >=50%, it is ensured that deformation energy penetrates into tissue core, it is thus achieved that uniform tissue and tiny carbide； Directly carry out cold rolling by the raw material coil of strip that hot-rolled process is obtained, made in hot rolling raw material pearlitic structrure by cold roller and deformed Sheet carbide is cataclasm, and produces substantial amounts of dislocation at intracrystalline, and cataclasm carbide and defect are carbide in annealing process Precipitation provide core, make distribution of carbides disperse, tissue is more uniformly distributed, use the application produce medium high carbon structural steel, pearl Body of light nodularization ratio can reach more than 95%, even tissue, and carbide is tiny, disperse, and intensity, hardness are relatively low, and plasticity and toughness are excellent, Surface-brightening and roughness are low, can manufacture high accuracy, the parts of high-quality.
Compared with prior art, the method can effectively reduce annealing passage, shortened process, solves in prior art Need through twice annealing, the cold rolling reduction ratio of single relatively low, cause deformation not permeate completely, easily cause tissue after annealing not Uniformly, the poor technical problem of plasticity and toughness, reach improving production efficiency, reduce the technique effect of cost.
Hereinafter example is illustrated:
Example 1
This example thickness is the manufacture method of the cold rolling carbon structural steels 65Mn of 0.8mm, cold rolling carbon structural steels 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 carbon structural steels 65Mn that thickness is 0.8mm, choosing the raw material coil of strip that thickness is 2.0mm, finish rolling is eventually Rolling temperature is 920 DEG C, and after finish rolling, cold rolling speed is 30 DEG C/s, and coiling temperature is 730 DEG C, steel coils packing slow cooling subsequently.
Pickling temperature 85 DEG C, the concentration of described hydrochloric acid is 12%, and the iron salt content in described hydrochloric acid is 105g/l, described acid Washing speed is 15m/min.
As shown in table 1, last passage roll surface roughness Ra is 0.5 μm in cold rolling pass distribution.
Table 1 cold rolling pass distributes
First passage Second passage 3rd passage Four-pass
21% 30% 18% 13.8%
The A of cold rolling carbon structural steels 65Mn1Temperature is 720 DEG C, heating-up temperature 700 DEG C, and temperature retention time is 10h, insulation knot It is cooled to 550 DEG C with the speed of 20 DEG C/h after bundle, is cooled to 300 DEG C with 50 DEG C/h subsequently, then is cooled to 45 DEG C with 40 DEG C/h, adopt during annealing With perhydro gas shielded gas.
The microstructure of this example is shown in Fig. 4, and its performance is shown in Table 2, and product surface roughness is 0.52 μm.
The performance of carbon structural steels 65Mn in table 2 example 1
Example 2
This example thickness is the manufacture method of the cold rolling structural alloy steel 42CrMo4 of 1.5mm, cold rolling structural alloy steel The component of 42CrMo4 and weight percent content are 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 is Fe and the most miscellaneous Matter.
According to the cold rolling structural alloy steel 42CrMo4 that thickness is 1.5mm, choose the raw material coil of strip that thickness is 3.0mm, finish rolling Finishing temperature is 860 DEG C, and after finish rolling, cold rolling speed is 18 DEG C/s, and coiling temperature is 680 DEG C, steel coils packing slow cooling subsequently.
Pickling temperature 75 DEG C, the concentration of described hydrochloric acid is 6%, and the iron salt content in described hydrochloric acid is 110g/l, described acid Washing speed is 30m/min.
As shown in table 3, last passage roll surface roughness Ra is 0.38 μm in cold rolling pass distribution.
Table 3 cold rolling pass distributes
First passage Second passage 3rd passage
19% 29% 13%
The A of cold rolling structural alloy steel 42CrMo41Temperature is 738 DEG C, heating-up temperature 703 DEG C, and temperature retention time is 30h, insulation It is cooled to 550 DEG C with the speed of 15 DEG C/h after end, is cooled to 300 DEG C with 100 DEG C/h subsequently, then be cooled to 50 DEG C with 30 DEG C/h, annealing Time protective gas use nitrogen hydrogen mixeding gas, wherein, hydrogen ratio is 70%.
The microstructure of this example is shown in Fig. 5, and its performance is shown in Table 4, and product surface roughness is 0.365 μm.
The performance of table 4 example 2 medium alloy constructional steel 42CrMo4
Example 3
This example thickness is the manufacture method of the cold rolling carbon structural steels SAE1055 of 1.0mm, cold rolling carbon structural steels SAE1055 chemical composition 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 carbon structural steels SAE1055 that thickness is 1.0mm, choosing thickness is 2.5mm raw material coil of strip, and finish rolling is eventually Rolling temperature is 912 DEG C, and after finish rolling, cold rolling speed is 24 DEG C/s, and coiling temperature is 700 DEG C, steel coils packing slow cooling subsequently.
Pickling temperature 81 DEG C, the concentration of described hydrochloric acid is 11%, and the iron salt content in described hydrochloric acid is 95g/l, described acid Washing speed is 21m/min.
As shown in table 5, last passage roll surface roughness Ra is 0.42 μm in cold rolling pass distribution.
Table 5 cold rolling pass distributes
First passage Second passage 3rd passage
25% 31% 23%
The A of cold rolling carbon structural steels SAE10551Temperature is 727 DEG C, heating-up temperature 677 DEG C, and temperature retention time is 21h, insulation It is cooled to 550 DEG C with the speed of 17 DEG C/h after end, is cooled to 300 DEG C with 80 DEG C/h subsequently, then is cooled to 50 DEG C with 37 DEG C/h, during annealing Protective gas use nitrogen hydrogen mixeding gas, wherein hydrogen ratio is 80%.
The microstructure of this example is shown in Fig. 6, and its performance is shown in Table 6, and product surface roughness is 0.412 μm.
The performance of carbon structural steels SAE1055 in table 6 example 3
Example 4
This example thickness is the manufacture method of the cold rolling structural alloy steel 30CrMo of 1.2mm, cold rolling structural alloy steel 30CrMo chemical composition 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 that thickness is 1.2mm, choose the raw material coil of strip that thickness is 2.7mm, finish rolling Finishing temperature is 896 DEG C, and after finish rolling, cold rolling speed is 16 DEG C/s, and coiling temperature is 710 DEG C, steel coils packing slow cooling subsequently.
Pickling temperature 78 DEG C, the concentration of described hydrochloric acid is 8%, and the iron salt content in described hydrochloric acid is 103g/l, described acid Washing speed is 45m/min.
As shown in table 7, last passage roll surface roughness Ra is 0.37 μm in cold rolling pass distribution.
Table 7 cold rolling pass distributes
First passage Second passage 3rd passage Four-pass
18% 24% 17% 14%
The A of cold rolling structural alloy steel 30CrMo1Temperature is 740 DEG C, heating-up temperature 715 DEG C, and temperature retention time is 23h, insulation It is cooled to 550 DEG C with the speed of 15 DEG C/h after end, is cooled to 300 DEG C with 67 DEG C/h subsequently, then is cooled to 50 DEG C with 22 DEG C/h, during annealing Protective gas use nitrogen hydrogen mixeding gas, wherein hydrogen ratio is 90%.
The microstructure of this example is shown in Fig. 7, and its performance is shown in Table 8, and product surface roughness is 0.381 μm.
The performance of table 8 example 4 medium alloy constructional steel 30CrMo
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof Within, then the present invention is also intended to comprise these change and modification.

Claims (9)

1. the manufacture method of a cold rolling medium high carbon structural steel, it is characterised in that the component of described 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 interpolation alloying element is less than 0.3%, and remaining is Ferrum and inevitable impurity element, described manufacture method includes:
Thickness according to described cold rolling medium high carbon structural steel and cold rolling reduction ratio choose raw material coil of strip, and described cold rolling reduction ratio >= 50%, the thickness range of described raw material coil of strip is 1.5mm-3.0mm, and described coil of strip is by strand being carried out finish rolling and batching After, then carry out slow cooling acquisition, wherein, finish rolling finishing temperature is 860 DEG C-920 DEG C, and essence cooling velocity after rolling controls at 30 DEG C/s Hereinafter, coiling temperature is 680-730 DEG C；
After being launched by described coil of strip, using hydrochloric acid to carry out pickling, wherein, described pickling temperature is 75 DEG C～85 DEG C, described pickling Speed is 15～45m/min, and the concentration of described hydrochloric acid is 6%～14%, the iron salt content≤110g/l in described hydrochloric acid；
Coil of strip after pickling is carried out cold rolling, described cold rolling first reduction ratio≤25%, the second percentage pass reduction is maximum, with After successively decrease, every single pass reduction ratio >=10%, cold rolling complete after roll surface roughness Ra≤0.5 μm of coil of strip；
Coil of strip after cold rolling completing is annealed, it is thus achieved that described cold rolling medium high carbon structural steel, wherein, the heating temperature of described annealing Degree is A1-50 DEG C～A1Being incubated 10～30h after-20 DEG C, and heating, insulation is cooled to the rate of cooling of≤20 DEG C/h after terminating 550 DEG C, it is cooled to 300 DEG C with 50～100 DEG C/h subsequently, then is cooled to less than 50 DEG C with 10～40 DEG C/h and comes out of the stove, A1For raw material coil of strip Pearlitic transformation temperature.
2. manufacture method as claimed in claim 1, it is characterised in that described finish rolling finishing temperature is 900～920 DEG C, finish rolling Rear rate of cooling controls at 20 DEG C/below s, and coiling temperature is 700-730 DEG C.
3. manufacture method as claimed in claim 1, it is characterised in that described pickling speed is 15～25m/min.
4. manufacture method as claimed in claim 1, it is characterised in that described single pass reduction ratio >=15%, enters cold rolling completing After roll surface roughness Ra≤0.3 μm of coil of strip.
5. manufacture method as claimed in claim 1, it is characterised in that the rate of cooling of described slow cooling be 10 DEG C/h～20 DEG C/ h。
6. manufacture method as claimed in claim 1, it is characterised in that described annealing specifically uses bell-type annealing.
7. manufacture method as claimed in claim 1, it is characterised in that protective gas during described annealing is perhydro gas or nitrogen Hydrogen mixed gas, wherein, ratio >=70% of hydrogen in the protective gas of place.
8. manufacture method as claimed in claim 7, it is characterised in that ratio >=90% of hydrogen in the protective gas of place.
9. the manufacture method as described in any claim in claim 1-8, it is characterised in that the heating-up temperature of described annealing For A1-35 DEG C～A1-20 DEG C, being incubated 15h～25h after heating, insulation terminates the rate of cooling≤15 DEG C/h of latter more than 550 DEG C.
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