CN106222553B - A kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm - Google Patents

A kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm Download PDF

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CN106222553B
CN106222553B CN201610696034.8A CN201610696034A CN106222553B CN 106222553 B CN106222553 B CN 106222553B CN 201610696034 A CN201610696034 A CN 201610696034A CN 106222553 B CN106222553 B CN 106222553B
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cold rolling
time
thickness
strip
coil
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CN106222553A (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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    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • 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
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • 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 application and provides a kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm, and the cold rolling medium high carbon alloy structure steel constituent and weight percent content are C：0.25-0.55%, Si：0.15-0.35%, Mn：0.10-2.0%, Cr：0.10-2.0%, Alt:0.010-0.030%, P≤0.015%, S≤0.005%, other addition alloying elements are no more than 0.3%, remaining is iron and inevitable impurity element.The manufacturing method includes：Smelting, refining, continuous casting, heating, finish rolling, pickling, cold rolling, intermediate annealing, cold rolling, intermediate annealing, cold rolling, finished products.By controlling steel inclusion, annealing by cold rolling three times and three times, the cold rolling medium high carbon alloy structural steel steel band that thickness is 0.1-0.4mm is obtained.Wherein control first time and second of cold rolling total reduction >=50%, and single pass reduction ratio >=10%, so that the lamella carbide of different zones is occurred cataclasm, by it is long when low temperature intermediate annealing, so that carbide is uniformly precipitated in fine particle shape, further decreases intensity, improves plasticity.

Description

A kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm
Technical field
The present invention relates to the cold rolling medium high carbon alloys that steel making technical field more particularly to a kind of thickness are 0.1-0.4mm The manufacturing method of structural steel.
Background technology
Medium high carbon alloy structural steel is widely used in each row such as hardware, household electrical appliances, tool, processing of stone, automobile, weaving Industry, the precision parts such as small spring, valve block, chain can be manufactured by being cold-rolled to after 0.1-0.4mm, this kind of product Surface Quality, Ingredient structural homogenity, field trash etc. all have high requirement.
Prior art discloses " a kind of automobile cold-rolled diaphragm spring steel and its production method ", specifically disclose a kind of vapour Automobile-used cold rolling diaphragm spring steel 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 moved back after batching Fire, first time annealing temperature are 700-840 DEG C, then carry out cold rolling, and first time cold rolling reduction ratio is 15-25%, is moved back for the second time Fiery temperature is 500-600 DEG C, and second of cold rolling reduction ratio is 10-20%, without annealing after second of cold rolling.This method Single cold rolling reduction ratio is relatively low, and deformation cannot permeate completely, and unannealed steel band forming property is poor after second of cold rolling, The production method mainly produces the cold-rolled steel coils of thickness >=1.7mm.
Invention content
The application provides a kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm, solves Medium high carbon alloy structural steel cold-rolled products thickness in the prior art is thicker, is susceptible to when being cold-rolled to thickness 0.4mm or less disconnected It splits, peel, the quality problems of hole, single cold rolling reduction ratio is relatively low, causes deformation that cannot permeate completely, and after cold rolling not Annealing, the poor technical problem of steel band forming property.
The application provides a kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm, the thickness The cold rolling medium high carbon alloy structure steel constituent and weight percent content that degree is 0.1-0.4mm are C：0.25-0.55%, Si： 0.15-0.35%, Mn：0.10-2.0%, Cr：0.10-2.0%, Alt:0.010-0.030%, P≤0.015%, S≤ 0.005%, other addition alloying elements are no more than 0.3%, remaining is iron and inevitable impurity element, the manufacturing method Including：
It smelts, carbon content >=0.05% of tapping at the end of controlling the smelting, tapping slag thickness of slag layer control is in 100mm Below；
It refining, inclusion modification is carried out using Calcium treatment in the refining process, Calcium treatment amount is 0.35-0.55kg/t, Soft blow 5-10min before Calcium treatment, soft blow 10-15min after Calcium treatment；
Continuous casting, at 15-35 DEG C, pulling rate fluctuation range is ± 0.2m/ for degree of superheat control in the casting process of the continuous casting Min obtains thickness >=50mm strand raw materials；
The strand raw material is heated；
Finish rolling is carried out to the strand raw material, the finish rolling finishing temperature is 860-920 DEG C, finish rolling postcooling speed control In 30 DEG C/s hereinafter, coiling temperature is 680-730 DEG C, subsequent steel coils packing slow cooling, thickness >=2.0mm of the coil of strip；
After the coil of strip is unfolded, pickling is carried out using hydrochloric acid, the pickling temperature is 75~85 DEG C, the pickling speed For 15~45m/min, a concentration of the 6~14% of the hydrochloric acid, molysite content≤110g/l in the hydrochloric acid；
To after pickling coil of strip carry out first time cold rolling, first time cold rolling total reduction >=50%, single pass reduction ratio >= 10%；
To the coil of strip first time intermediate annealing after first time cold rolling；
Second of cold rolling, second of cold rolling total reduction >=50%, single track are carried out to the coil of strip after first time intermediate annealing Secondary reduction ratio >=10%；
Second of intermediate annealing is carried out to the coil of strip after second of cold rolling；
Third time cold rolling carried out to the coil of strip after second of intermediate annealing, third time cold rolling total reduction >=30%, and the Cold rolling back roller surface roughness Ra≤0.5 μm three times；
Finished products are carried out to the coil of strip after third time cold rolling, obtain the cold rolling medium high carbon alloy that thickness is 0.1-0.4mm Structural steel.
Preferably, the first time intermediate annealing and second of intermediate heating temperature A moved back1- 70 DEG C~A1- 40 DEG C, 15~25h of soaking time is cooled to 550 DEG C after heat preservation with the cooling velocity of≤20 DEG C/h, is then cooled to 50~100 DEG C/h 300 DEG C, then be cooled to 100 DEG C or less with 10~40 DEG C/h and come out of the stove, wherein A1For the pearlitic transformation temperature of raw material coil of strip.
Preferably, the heating temperature A of the finished products1- 80~A1- 50 DEG C, 10~20h of soaking time, after heat preservation It is cooled to 550 DEG C with the cooling velocity of≤20 DEG C/h, is then cooled to 300 DEG C with 50~100 DEG C/h, then be cooled to 50 with 10~40 DEG C/h DEG C or less come out of the stove, wherein A1For the pearlitic transformation temperature of raw material coil of strip.
Preferably, the heating temperature of the finished products is A1- 65 DEG C~A1- 50 DEG C, soaking time is 10~15h, heat preservation After 550 DEG C or more of cooling velocity≤15 DEG C/h.
Preferably, the first time intermediate annealing, second of intermediate annealing and finished products are all made of bell-type annealing, protection Gas is perhydro or nitrogen and hydrogen mixture atmosphere, ratio >=70% of hydrogen in the protective gas.
Preferably, the finish rolling finishing temperature is 900~920 DEG C, and finish rolling postcooling speed control is in 20 DEG C/s hereinafter, volume It is 700-730 DEG C to take temperature.
Preferably, single pass reduction ratio >=15% of the first time cold rolling and second of cold rolling, third time cold rolling stagnation pressure Lower rate >=40%, and third time cold rolling back roller surface roughness Ra≤0.3 μm.
The application has the beneficial effect that：
1, the application by control endpoint carbon content of converter and the lower quantity of slag of tapping, refining process inclusions class and The procedure parameters such as soft blow time, the degree of superheat of casting and casting speed control control steel inclusion, make steel inclusion ruler It is very little it is small, quantity is few, avoid in the cold-rolled process of follow-up heavy reduction occur decortication, hole, broken belt etc. caused by field trash Quality problems.
2, the application controls the technological parameters such as finishing temperature, cooling velocity, the coiling temperature of hot-rolled process, makes hot-rolled product Intensity is lower, and plasticity and toughness are more preferable, and structure property is more uniformly distributed, can direct cold rolling and bear 50% or more deflection, by cold Rolling deformation keeps the sheet carbide in hot-rolled product pearlitic structrure cataclasm, and generates a large amount of dislocation transgranular, cataclasm Carbide and defect provide core for the precipitation of carbide in annealing process, make distribution of carbides disperse, are more uniformly distributed.
3, the application control first time cold rolling and second of cold rolling total reduction >=50%, and single pass reduction ratio >= 10%, so that the lamella carbide of different zones is occurred cataclasm, by it is long when low temperature intermediate annealing, make carbide be in fine particle Shape is uniformly precipitated.
4, the application control third time cold rolling total reduction >=30%, it is ensured that deformation energy penetrates into tissue core, by with Intermediate annealing avoids steel band from being bonded compared to the finished products that temperature is higher, the time is shorter, makes ferrite crystal grain recrystallization, carbonization Composition granule is grown up, and is further decreased intensity, is improved plasticity.
Use the thickness that the application produces for the medium high carbon alloy structural steel cold-rolled products of 0.1-0.4mm, pearlitic spheroidization Ratio can reach 95% or more, and steel is pure, and field trash is tiny, quantity is few, and even tissue, carbide uniformly, disperse, by force Degree, hardness are relatively low, and plasticity and toughness are excellent, and there is good formability and heat treatment characteristic, surface-brightening and roughness is low can manufacture height The precision parts of precision, high-quality.
By controlling steel inclusion, annealing by cold rolling three times and three times, obtain thickness is the manufacturing method of the application The cold rolling medium high carbon alloy structural steel steel band of 0.1-0.4mm, wherein control first time cold rolling and second of cold rolling total reduction >= 50%, and single pass reduction ratio >=10%, so that the lamella carbide of different zones is occurred cataclasm, is moved back among low temperature when passing through long Fire makes carbide be uniformly precipitated in fine particle shape, is moved back by the finished product that temperature is higher compared with intermediate annealing, the time is shorter Fire avoids steel band from being bonded, and ferrite crystal grain recrystallization, carbide particle is made to grow up, and further decreases intensity, improves plasticity, solution Medium high carbon alloy structural steel cold-rolled products thickness in the prior art of having determined is thicker, is easy out when being cold-rolled to thickness 0.4mm or less Now fracture, decortication, hole and other issues, single cold rolling reduction ratio is relatively low, causes deformation that cannot permeate completely, and cold rolling terminates It is unannealed afterwards, the poor technical problem of steel band forming property.
Description of the drawings
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 be only the present invention some Embodiment.
Fig. 1 is the manufacturing method for the cold rolling medium high carbon alloy structural steel that a kind of thickness provided by the present application is 0.1-0.4mm Flow chart.
Specific implementation mode
The embodiment of the present application is by providing a kind of manufacturer for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm Method, it is thicker to solve medium high carbon alloy structural steel cold-rolled products thickness in the prior art, holds when being cold-rolled to thickness 0.4mm or less Easily there is fracture, decortication, hole and other issues, single cold rolling reduction ratio is relatively low, causes deformation that cannot permeate completely, and cold rolling After unannealed, the poor technical problem of steel band forming property.
Technical solution in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
The application provides
A kind of manufacturing method for the cold rolling medium high carbon alloy structural steel that thickness is 0.1-0.4mm, the thickness is 0.1- The cold rolling medium high carbon alloy structure steel constituent and weight percent content of 0.4mm is C：0.25-0.55%, Si：0.15- 0.35%, Mn：0.10-2.0%, Cr：0.10-2.0%, Alt:0.010-0.030%, P≤0.015%, S≤0.005%, It adds alloying element and is no more than 0.3%, remaining is iron and inevitable impurity element, and the manufacturing method includes：
It smelts, carbon content >=0.05% of tapping at the end of controlling the smelting, tapping slag thickness of slag layer control is in 100mm Below；
It refining, inclusion modification is carried out using Calcium treatment in the refining process, Calcium treatment amount is 0.35-0.55kg/t, Soft blow 5-10min before Calcium treatment, soft blow 10-15min after Calcium treatment；
Continuous casting, at 15-35 DEG C, pulling rate fluctuation range is ± 0.2m/ for degree of superheat control in the casting process of the continuous casting Min obtains thickness >=50mm strand raw materials；
The strand raw material is heated；
Finish rolling is carried out to the strand raw material, the finish rolling finishing temperature is 860-920 DEG C, finish rolling postcooling speed control In 30 DEG C/s hereinafter, coiling temperature is 680-730 DEG C, subsequent steel coils packing slow cooling, thickness >=2.0mm of the coil of strip；
After the coil of strip is unfolded, pickling is carried out using hydrochloric acid, the pickling temperature is 75~85 DEG C, the pickling speed For 15~45m/min, a concentration of the 6~14% of the hydrochloric acid, molysite content≤110g/l in the hydrochloric acid；
To after pickling coil of strip carry out first time cold rolling, first time cold rolling total reduction >=50%, single pass reduction ratio >= 10%；
To the coil of strip first time intermediate annealing after first time cold rolling；
Second of cold rolling, second of cold rolling total reduction >=50%, single track are carried out to the coil of strip after first time intermediate annealing Secondary reduction ratio >=10%；
Second of intermediate annealing is carried out to the coil of strip after second of cold rolling；
Third time cold rolling carried out to the coil of strip after second of intermediate annealing, third time cold rolling total reduction >=30%, and the Cold rolling back roller surface roughness Ra≤0.5 μm three times；
Finished products are carried out to the coil of strip after third time cold rolling, obtain the cold rolling medium high carbon alloy that thickness is 0.1-0.4mm Structural steel.
By controlling steel inclusion, annealing by cold rolling three times and three times, obtain thickness is the manufacturing method of the application The cold rolling medium high carbon alloy structural steel steel band of 0.1-0.4mm, wherein control is smelted and refinery practice parameter, by cold rolling three times, The medium high carbon alloy steel cold-rolled products of acquisition thickness 0.1-0.4mm, control first time cold rolling and second of cold rolling total reduction >= 50%, and single pass reduction ratio >=10%, so that the lamella carbide of different zones is occurred cataclasm, is moved back among low temperature when passing through long Fire makes carbide be uniformly precipitated in fine particle shape, is moved back by the finished product that temperature is higher compared with intermediate annealing, the time is shorter Fire avoids steel band from being bonded, and ferrite crystal grain recrystallization, carbide particle is made to grow up, and further decreases intensity, improves plasticity, solution Medium high carbon alloy structural steel cold-rolled products thickness in the prior art of having determined is thicker, is easy out when being cold-rolled to thickness 0.4mm or less Now fracture, decortication, hole and other issues, single cold rolling reduction ratio is relatively low, causes deformation that cannot permeate completely, and cold rolling terminates It is unannealed afterwards, the poor technical problem of steel band forming property.
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 thicker in order to solve medium high carbon alloy structural steel cold-rolled products thickness in the prior art, it is cold-rolled to thickness 0.4mm Fracture, decortication, hole and other issues are susceptible to when following, single cold rolling reduction ratio is relatively low, causes deformation that cannot ooze completely Thoroughly, and unannealed after cold rolling, a kind of poor technical problem of steel band forming property, thickness of the application offer is 0.1- The manufacturing method of the cold rolling medium high carbon alloy structural steel of 0.4mm.Introduce lower medium and high carbon steel first, industry is by the weight percent hundred of carbon Steel more than or equal to 0.25% is referred to as medium and high carbon steel.
A kind of thickness is the cold rolling medium high carbon alloy structural steel of 0.1-0.4mm, component and weight percent content For C：0.25-0.55%, Si：0.15-0.35%, Mn：0.10-2.0%, Cr：0.10-2.0%, Alt:0.010-0.030%, P≤0.015%, S≤0.005%, other addition alloying elements are no more than 0.3%, remaining is iron and inevitable impurity member Element.The alloying element can be one or more of elements such as Cr, Mo.
The thickness is the manufacturing method of the cold rolling medium high carbon alloy structural steel of 0.1-0.4mm, is included the following steps, is such as schemed Shown in 1：
Step 110, it smelts, controls tapping carbon content >=0.05% at the end of the smelting, slag thickness of slag layer of tapping Control is in 100mm or less；
Step 120, it refines, inclusion modification is carried out using Calcium treatment in the refining process, Calcium treatment amount is 0.35- 0.55kg/t, soft blow 5-10min before Calcium treatment, soft blow 10-15min after Calcium treatment.The Calcium treatment amount is that calcium line is added Weight.
Step 130, continuous casting, in the casting process of the continuous casting degree of superheat control at 15-35 DEG C, pulling rate fluctuation range is ± 0.2m/min obtains thickness >=50mm strand raw materials.By controlling the pulling rate fluctuation range in casting process, liquid fluctuating is avoided Slag is caused to generate coarse field trash.
Step 140, the strand raw material is heated；
Step 150, finish rolling is carried out to the strand raw material, the finish rolling finishing temperature is 860-920 DEG C, finish rolling postcooling Speed control in 30 DEG C/s hereinafter, coiling temperature be 680-730 DEG C, subsequent steel coils packing slow cooling.Wherein, the cooling of the slow cooling Speed is 10 DEG C/h~20 DEG C/h, the coil of strip thickness >=2.0mm.
Step 160, after the coil of strip being unfolded, pickling is carried out using hydrochloric acid, the pickling temperature is 75~85 DEG C, described Pickling speed is 15~45m/min, a concentration of the 6~14% of the hydrochloric acid, molysite content≤110g/l in the hydrochloric acid.
Step 170, first time cold rolling, first time cold rolling total reduction >=50%, single pass are carried out to the coil of strip after pickling Reduction ratio >=10%；
Step 180, to the coil of strip first time intermediate annealing after first time cold rolling, the heating temperature of the first time intermediate annealing Spend A1- 70 DEG C~A1- 40 DEG C, 15~25h of soaking time is cooled to 550 DEG C after heat preservation with the cooling velocity of≤20 DEG C/h, with It is cooled to 300 DEG C with 50~100 DEG C/h afterwards, then is cooled to 100 DEG C or less with 10~40 DEG C/h and comes out of the stove.
Step 190, to after first time intermediate annealing coil of strip carry out second of cold rolling, second of cold rolling total reduction >= 50%., single pass reduction ratio >=10%；
Step 200, second of intermediate annealing, second of intermediate heating temperature moved back are carried out to the coil of strip after second of cold rolling A1- 70 DEG C~A1- 40 DEG C, 15~25h of soaking time is cooled to 550 DEG C, then after heat preservation with the cooling velocity of≤20 DEG C/h It is cooled to 300 DEG C with 50~100 DEG C/h, then is cooled to 100 DEG C or less with 10~40 DEG C/h and comes out of the stove.
Step 210, to after second of intermediate annealing coil of strip carry out third time cold rolling, third time cold rolling total reduction >= 30%, and third time cold rolling back roller surface roughness Ra≤0.5 μm；
Step 220, finished products are carried out to the coil of strip after third time cold rolling, obtained in the cold rolling that thickness is 0.1-0.4mm High carbon alloy structural steel, the heating temperature A of finished products1- 80~A1- 50 DEG C, 10~20h of soaking time, after heat preservation with≤ The cooling velocity of 20 DEG C/h is cooled to 550 DEG C, is then cooled to 300 DEG C with 50~100 DEG C/h, then with 10~40 DEG C/h be cooled to 50 DEG C with Under come out of the stove.Wherein, A1For the pearlitic transformation temperature of raw material coil of strip.
Wherein, the first time intermediate annealing, second of intermediate annealing and finished products are all made of bell-type annealing, protect gas Body is perhydro or nitrogen and hydrogen mixture atmosphere, ratio >=70% of hydrogen in the protective gas.
Specifically, finish rolling finishing temperature is 900~920 DEG C, and finish rolling postcooling speed control is in 20 DEG C/s hereinafter, batching temperature Degree is 700-730 DEG C.
Also, single pass reduction ratio >=15% of the first time cold rolling and second of cold rolling, third time cold rolling total reduction >=40%, and third time cold rolling back roller surface roughness Ra≤0.3 μm.
Again, the heating temperature of the finished products is A1- 65 DEG C~A1- 50 DEG C, soaking time is 10~15h, and heat preservation terminates 550 DEG C or more of cooling velocity≤15 DEG C/h afterwards.
A kind of thickness of the application is the manufacturing method and prior art phase of the cold rolling medium high carbon alloy structural steel of 0.1-0.4mm Than having the advantages that：
1, the application by control endpoint carbon content of converter and the lower quantity of slag of tapping, refining process inclusions class and The procedure parameters such as soft blow time, the degree of superheat of casting and casting speed control control steel inclusion, make steel inclusion ruler It is very little it is small, quantity is few, avoid in the cold-rolled process of follow-up heavy reduction occur decortication, hole, broken belt etc. caused by field trash Quality problems.
2, the application controls the technological parameters such as finishing temperature, cooling velocity, the coiling temperature of hot-rolled process, makes hot-rolled product Intensity is lower, and plasticity and toughness are more preferable, and structure property is more uniformly distributed, can direct cold rolling and bear 50% or more deflection, by cold Rolling deformation keeps the sheet carbide in hot-rolled product pearlitic structrure cataclasm, and generates a large amount of dislocation transgranular, cataclasm Carbide and defect provide core for the precipitation of carbide in annealing process, make distribution of carbides disperse, are more uniformly distributed.
3, the application control first time cold rolling and second of cold rolling total reduction >=50%, and single pass reduction ratio >= 10%, so that the lamella carbide of different zones is occurred cataclasm, by it is long when low temperature intermediate annealing, make carbide be in fine particle Shape is uniformly precipitated.
4, the application control third time cold rolling total reduction >=30%, it is ensured that deformation energy penetrates into tissue core, by with Intermediate annealing avoids steel band from being bonded compared to the finished products that temperature is higher, the time is shorter, makes ferrite crystal grain recrystallization, carbonization Composition granule is grown up, and is further decreased intensity, is improved plasticity.
Use the thickness that the application produces for the medium high carbon alloy structural steel cold-rolled products of 0.1-0.4mm, pearlitic spheroidization Ratio can reach 95% or more, and steel is pure, and field trash is tiny, quantity is few, and even tissue, carbide uniformly, disperse, by force Degree, hardness are relatively low, and plasticity and toughness are excellent, and there is good formability and heat treatment characteristic, surface-brightening and roughness is low can manufacture height The precision parts of precision, high-quality.
By controlling steel inclusion, annealing by cold rolling three times and three times, obtain thickness is the manufacturing method of the application The cold rolling medium high carbon alloy structural steel steel band of 0.1-0.4mm, wherein control is smelted and refinery practice parameter, by cold rolling three times, The medium high carbon alloy steel cold-rolled products of acquisition thickness 0.1-0.4mm, control first time cold rolling and second of cold rolling total reduction >= 50%, and single pass reduction ratio >=10%, so that the lamella carbide of different zones is occurred cataclasm, is moved back among low temperature when passing through long Fire makes carbide be uniformly precipitated in fine particle shape, is moved back by the finished product that temperature is higher compared with intermediate annealing, the time is shorter Fire avoids steel band from being bonded, and ferrite crystal grain recrystallization, carbide particle is made to grow up, and further decreases intensity, improves plasticity, solution Medium high carbon alloy structural steel cold-rolled products thickness in the prior art of having determined is thicker, is easy out when being cold-rolled to thickness 0.4mm or less Now fracture, decortication, hole and other issues, single cold rolling reduction ratio is relatively low, causes deformation that cannot permeate completely, and cold rolling terminates It is unannealed afterwards, the poor technical problem of steel band forming property.
Example 1
Thickness described in this example is the manufacturing method of the cold rolling structural alloy steel 50Cr of 0.1mm, chemical composition C： 0.50wt.%, Si:0.27wt.%, Mn：0.60wt.%, Cr：1.0wt.%, P：0.012wt.%, S：0.001wt.%, Alt：0.021% remaining be Fe and inevitable impurity.
Strand raw thickness is 55mm, and finish rolling finishing temperature is 920 DEG C, and cold rolling speed is 30 DEG C/s after finish rolling, batches temperature Degree is 730 DEG C, subsequent steel coils packing slow cooling, and the thickness of coil of strip is 2.0mm.
Pickling temperature is 85 DEG C, a concentration of the 12% of the hydrochloric acid, the molysite content 105g/l in the hydrochloric acid, the acid It is 15m/min to wash speed.
Cold rolling pass distribution is as shown in table 1, and third time cold roll surface roughness Ra is 0.5 μm, first time intermediate annealing, the Secondary intermediate annealing and finished products are annealed using perhydro protective gas.
1 cold rolling pass of table distributes
The A of 50Cr1Temperature is 730 DEG C, and first time intermediate annealing and second of intermediate annealing process are：Heating temperature 650 DEG C, soaking time 15h is cooled to 550 DEG C after heat preservation with the speed of 20 DEG C/h, is then cooled to 300 DEG C with 50 DEG C/h, then with 40 DEG C/h is cooled to 90 DEG C.Finished product annealing process is：670 DEG C, soaking time 10h of heating temperature, with 17 DEG C/h after heat preservation Speed be cooled to 550 DEG C, be then cooled to 300 DEG C with 70 DEG C/h, then be cooled to 45 DEG C with 30 DEG C/h and come out of the stove.
The performance of this example is shown in Table 2, and product surface roughness is 0.40 μm.
The performance of 2 example of table, 1 structural alloy steel 50Cr
Example 2
Thickness described in this example is the manufacturing method of the cold rolling structural alloy steel 42CrMo4 of 0.4mm, chemical composition 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 inevitable impurity.
Strand raw thickness is 90mm, finish rolling finishing temperature is 860 DEG C, and cold rolling speed is 18 DEG C/s after finish rolling, batches temperature Degree is 680 DEG C, subsequent steel coils packing slow cooling, and the thickness of the coil of strip is 2.5mm.
Pickling temperature is 75 DEG C, a concentration of the 6% of the hydrochloric acid, the molysite content in the hydrochloric acid is 110g/l, described Pickling speed is 30m/min.
Cold rolling pass distribution is as shown in table 3, and third time cold rolling back roller surface roughness Ra is 0.45 μm, intermediate for the first time to move back Fire, second of intermediate annealing and finished products use protective gas to be mixed for nitrogen hydrogen, and the ratio of hydrogen is 70%.
3 cold rolling pass of table distributes
The A of 42CrMo41Temperature is 738 DEG C, and first time intermediate annealing and second of intermediate annealing process are：Heating temperature 698 DEG C, soaking time 25h is cooled to 550 DEG C after heat preservation with the speed of 15 DEG C/h, is then cooled to 300 DEG C with 100 DEG C/h, It is cooled to 87 DEG C again with 30 DEG C/h to come out of the stove.Finished product annealing process is：658 DEG C of heating temperature, soaking time 20h, after heat preservation It is cooled to 550 DEG C with the speed of 15 DEG C/h, is then cooled to 300 DEG C with 65 DEG C/h, then be cooled to 48 DEG C with 28 DEG C/h and come out of the stove.
The performance of this example is shown in Table 4, and product surface roughness is 0.323 μm.
The performance of 4 example of table, 2 medium alloy constructional steel 42CrMo4
Example 3
Thickness described in this example is the manufacturing method of the cold rolling structural alloy steel 40CrMn of 0.2mm, chemical composition C： 0.40wt.%, Si：0.35wt.%, Mn：0.90wt.%, P：0.010wt.%, S：0.005wt.%, Alt：0.025%, Cr： 1.0%, remaining is Fe and inevitable impurity.
Strand raw thickness is 150mm, and finish rolling finishing temperature is 912 DEG C, and cold rolling speed is 24 DEG C/s after finish rolling, batches temperature Degree is 700 DEG C, subsequent steel coils packing slow cooling, and the thickness of the coil of strip is 2.2mm.
81 DEG C of pickling temperature, a concentration of the 11% of the hydrochloric acid, the molysite content in the hydrochloric acid is 95g/l, the acid It is 21m/min to wash speed.
Cold rolling pass distribution is as shown in table 5, and third time cold rolling back roller surface roughness Ra is 0.35 μm, intermediate for the first time to move back Fire, second of intermediate annealing and finished products use protective gas to be mixed for nitrogen hydrogen, hydrogen ratio 80%.
5 cold rolling pass of table distributes
The A of 40CrMn1Temperature is 735 DEG C, and first time intermediate annealing and second of intermediate annealing process are：Heating temperature 677 DEG C, soaking time 21h is cooled to 550 DEG C after heat preservation with the speed of 17 DEG C/h, is then cooled to 300 DEG C with 80 DEG C/h, It is cooled to 86 DEG C again with 37 DEG C/h.Finished product annealing process is：667 DEG C of heating temperature, soaking time 16h, with 13 after heat preservation DEG C/speed of h is cooled to 550 DEG C, then it is cooled to 300 DEG C with 74 DEG C/h, then be cooled to 43 DEG C with 29 DEG C/h and come out of the stove.
The performance of this example is shown in Table 6, and product surface roughness is 0.312 μm.
The performance of 6 example of table, 3 medium alloy constructional steel 40CrMn
Example 4
Thickness described in this example is the manufacturing method of the cold rolling structural alloy steel 30CrMo of 0.3mm, chemical composition C： 0.30wt.%, Si：0.19wt.%, Mn：0.56wt.%, P：0.013wt.%, S：0.003wt.%, Alt：0.020%, Cr： 1.0%, Mo：0.19%, remaining is Fe and inevitable impurity.
Strand raw thickness is 200mm, and finish rolling finishing temperature is 896 DEG C, and cold rolling speed is 16 DEG C/s after finish rolling, batches temperature Degree is 710 DEG C, subsequent steel coils packing slow cooling, and the thickness of the coil of strip is 2.3mm.
78 DEG C of pickling temperature, a concentration of the 8% of the hydrochloric acid, the molysite content in the hydrochloric acid is 103g/l, the acid It is 45m/min to wash speed.
Cold rolling pass distribution is as shown in table 7, and third time Rolling roller surface roughness Ra is 0.37 μm, first time intermediate annealing, Second of intermediate annealing and finished products use atmosphere to be mixed for nitrogen hydrogen, hydrogen ratio 90%.
7 cold rolling pass of table distributes
The A of 30CrMo1Temperature is 740 DEG C, and first time intermediate annealing and second of intermediate annealing process are：Heating temperature 680 DEG C, soaking time 23h is cooled to 550 DEG C after heat preservation with the speed of 15 DEG C/h, is then cooled to 300 DEG C with 67 DEG C/h, It is cooled to 99 DEG C again with 22 DEG C/h.Finished product annealing process is：685 DEG C of heating temperature, soaking time 15h, with 14 after heat preservation DEG C/speed of h is cooled to 550 DEG C, then it is cooled to 300 DEG C with 81 DEG C/h, then be cooled to 41 DEG C with 26 DEG C/h and come out of the stove.
The performance of this example is shown in Table 8, and product surface roughness is 0.325 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 God 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 (6)

1. a kind of thickness is the manufacturing method of the cold rolling medium high carbon alloy structural steel of 0.1-0.4mm, which is characterized in that the thickness It is C for the cold rolling medium high carbon alloy structure steel constituent and weight percent content of 0.1-0.4mm：0.25-0.55%, Si：0.15- 0.35%, Mn：0.10-2.0%, Cr：0.10-2.0%, Alt:0.010-0.030%, P≤0.015%, S≤0.005%, It adds alloying element and is no more than 0.3%, remaining is iron and inevitable impurity element, and the manufacturing method includes：
Smelt, control carbon content >=0.05% of tapping at the end of the smelting, the control of tapping slag thickness of slag layer 100mm with Under；
Refining carries out inclusion modification in the refining process using Calcium treatment, and Calcium treatment amount is 0.35-0.55kg/t, at calcium Soft blow 5-10min before reason, soft blow 10-15min after Calcium treatment；
Continuous casting, at 15-35 DEG C, pulling rate fluctuation range is ± 0.2m/min, is obtained for degree of superheat control in the casting process of the continuous casting Obtain thickness >=50mm strand raw materials；
The strand raw material is heated；
Finish rolling is carried out to the strand raw material, the finish rolling finishing temperature is 860-920 DEG C, and finish rolling postcooling speed control is 30 DEG C/s hereinafter, coiling temperature be 680-730 DEG C, subsequent steel coils packing slow cooling, thickness >=2.0mm of the coil of strip；
After the coil of strip is unfolded, pickling is carried out using hydrochloric acid, the pickling temperature is 75~85 DEG C, and the pickling speed is 15 ~45m/min, a concentration of the 6~14% of the hydrochloric acid, molysite content≤110g/L in the hydrochloric acid；
First time cold rolling, first time cold rolling total reduction >=50%, single pass reduction ratio >=10% are carried out to the coil of strip after pickling；
To the coil of strip first time intermediate annealing after first time cold rolling；
Second of cold rolling, second of cold rolling total reduction >=50%, single pass pressure are carried out to the coil of strip after first time intermediate annealing Lower rate >=10%；
Second of intermediate annealing is carried out to the coil of strip after second of cold rolling；
Third time cold rolling, third time cold rolling total reduction >=30%, and third time are carried out to the coil of strip after second of intermediate annealing Cold rolling back roller surface roughness Ra≤0.5 μm；
The first time intermediate annealing and second of intermediate heating temperature A moved back1- 70 DEG C~A1- 40 DEG C, soaking time 15 ~25h 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 100 DEG C or less and comes out of the stove, wherein A1For the pearlitic transformation temperature of raw material coil of strip；
Finished products are carried out to the coil of strip after third time cold rolling, obtain the cold rolling medium high carbon alloy structure that thickness is 0.1-0.4mm Steel.
2. manufacturing method as described in claim 1, which is characterized in that the heating temperature A of the finished products1- 80~A1-50 DEG C, 10~20h of soaking time is cooled to 550 DEG C after heat preservation with the cooling velocity of≤20 DEG C/h, then with 50~100 DEG C/h It is cooled to 300 DEG C, then is cooled to 50 DEG C or less with 10~40 DEG C/h and comes out of the stove, wherein A1For the pearlitic transformation temperature of raw material coil of strip.
3. manufacturing method as claimed in claim 2, which is characterized in that the heating temperature of the finished products is A1- 65 DEG C~ A1- 50 DEG C, soaking time is 10~15h, 550 DEG C or more of cooling velocity≤15 DEG C/h after heat preservation.
4. manufacturing method as described in claim 1, which is characterized in that the first time intermediate annealing, second of intermediate annealing It is all made of bell-type annealing with finished products, protective gas is perhydro or nitrogen and hydrogen mixture atmosphere, the ratio of hydrogen in the protective gas Example >=70%.
5. the manufacturing method as described in claim 1-4 any claims, which is characterized in that the finish rolling finishing temperature is 900~920 DEG C, finish rolling postcooling speed control is in 20 DEG C/s hereinafter, coiling temperature is 700-730 DEG C.
6. the manufacturing method as described in claim 1-4 any claims, which is characterized in that the first time cold rolling and second Single pass reduction ratio >=15% of secondary cold rolling, third time cold rolling total reduction >=40%, and third time cold rolling back roller surface roughness Ra≤0.3μm。
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