CN105483537A - Cold-rolling and stamping-use steel with excellent planar isotropy and 180 MPa-level yield strength and manufacturing method thereof - Google Patents
Cold-rolling and stamping-use steel with excellent planar isotropy and 180 MPa-level yield strength and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses cold-rolling and stamping-use steel with excellent planar isotropy and a manufacturing method thereof. The cold-rolling and stamping-use steel is applied to covering parts of inner and outer parts of automobiles, and is characterized by comprising the following raw materials by weight percent: 0.0040-0.0060% of C, 0.10-0.20% of Mn, 0.03-0.04% of ALs, 0.010-0.015% of Nb, 0.010-0.020% of Si, 0.002-0.012% of P, 0.001-0.003% of N, and (48/14) % of N or more and 0.010% or less of Ti, with the balance being Fe and unavoidable impurities. The cold-rolling and stamping-use steel provided by the invention has 180 MPa-level yield strength and excellent deep drawability, and has the characteristic that delta r is smaller than or equal to 0.20.
Description
Technical field
The present invention refers to the cold-rolling and punching steel that a kind of planar isotropy is excellent and manufacture method thereof particularly, and this cold-rolling and punching steel is for being applied to automobile interior exterior portion Abdeckteil.
Background technology
Isotropic steel (IS, isotropystee1) has low △ r value (△ r:(r
0+ r
90-2r
45)/2) feature, during shaping, material steady flow and coordination mutually in all directions, is conducive to obtaining good formability, especially for punching press cup-shaped object, wall thickness reduction is even and ear processed is very little, is used for the punching of battery case class, automobile exterior panel part.Current, the product with isotropic characteristics mainly adopts 0.01 ~ 0.05%C to design, and yield strength, in 220MPa rank, 260MPa rank and 300MPa rank, cannot meet partially-formed more complicated part punching.Need a kind of deep drawability excellent, there is again the use that the excellent steel plate of planar isotropy meets the complicated automobile panel be shaped simultaneously.
At present, cold rolling isotropic characteristics steel plate yield strength is in 220MPa rank, 260MPa rank, 300MPa rank.
Summary of the invention
Technical problem to be solved by this invention is just to provide the excellent cold-rolling and punching steel of a kind of planar isotropy and manufacture method thereof, the yield strength that the present invention prepares is the cold-rolled products that the cold-rolling and punching steel of 180MPa rank has isotropic characteristic, punching performance is excellent, meets the use of the complicated automobile panel be shaped.
For achieving the above object, a kind of planar isotropy excellent yield strength provided by the invention is the cold-rolling and punching steel of 180MPa rank, and the raw materials by weight of described cold-rolling and punching steel is counted: the N < Ti of C:0.0040 ~ 0.0060%, Mn:0.10 ~ 0.30%, ALs:0.02 ~ 0.06%, Nb:0.005 ~ 0.020%, Si≤0.03%, P≤0.015%, N≤0.003%, (48/14) % and Ti < 0.010%, surplus are Fe and inevitable impurity.
Further, the raw materials by weight of described cold-rolling and punching steel is counted: the N < Ti of C:0.0040 ~ 0.0060%, Mn:0.10 ~ 0.20%, ALs:0.03 ~ 0.04%, Nb:0.010 ~ 0.015%, Si:0.010 ~ 0.020%, P:0.002 ~ 0.012%, N:0.001 ~ 0.003%, (48/14) % and Ti < 0.010%, surplus are Fe and inevitable impurity.
Again further, the raw materials by weight of described cold-rolling and punching steel is counted: C:0.0055%, Mn:0.17%, ALs:0.035%, Nb:0.012%, Si:0.012%, P:0.008%, N:0.0018%, Ti:0.008%, surplus are Fe and inevitable impurity.
Again further, described cold-rolling and punching steel R
p0.2=180 ~ 230MPa, tensile strength Rm=300 ~ 380MPa, elongation A
80mm>=36%, plastic strain ratio r
90>=1.4, work hardening exponent n
90>=0.18 and △ r≤0.20.
Present invention also offers the preparation method that a kind of planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa rank, the method is batched by heating of plate blank, high temperature rolling, cooling, cold rolling, continuous annealing, smooth six large steps prepare cold-rolling and punching steel, wherein
1) in heating of plate blank process, slab soaking temperature 1260 ~ 1320 DEG C;
2), in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 900 ~ 930 DEG C, rolling thickness is 3.0 ~ 5.0mm
3) cool in coiling process, steel plate batches to 710 ~ 730 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to 70 ~ room temperature, and scale on surface is removed in pickling, implements 76 ~ 80% total reductions and carries out cold rolling, rolling thickness 0.6 ~ 1.2mm;
5) in continuous annealing process, continuous annealing furnace soaking zone steel billet temperature 810 ~ 840 DEG C, cool fast after slow cooling section is cooled to 600 DEG C, rapid cooling section rate of cooling-15 ~-30 DEG C/s, process in overaging section after being cooled to 460 ~ 450 DEG C, overaging section temperature is 430 ~ 400 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.0 ~ 1.4% smooth unit elongation by levelling machine rolling load.
The selection of raw material of the present invention
C content of the present invention reduces (comparatively soft steel), improves plasticity; Ensure suitable C in steel, be combined into Secondary phase particle with Nb, Ti, be conducive to the isotropy controlling steel.
The present invention adds Mn element with low cost, plays the effect of solution strengthening in steel, controls the intensity of steel.
In the present invention, S is harmful element in deep drawing steel, forms MnS, TiS sulfides in steel, should avoid S too high levels, P in this steel as control of deleterious element.
In the present invention, Al adds as reductor in deep drawing steel, is dissolved in the oxygen in molten steel when object mainly removes smelting, and aluminium is as determining nitrogen agent in addition, can suppress the solid solution of nitrogen in ferrite, eliminates strain aging, improves low-temperature flexibility.
In the present invention, the negative impact of N causes steel plate to surrender effect and strain aging, by the content of less N element, with steel sheet stable performance.
The N element that the Ti element that the present invention adds trace is mainly used in fixing steel, carries out the addition of control Ti according to 0.010% > Ti > (48/14) N%.
In the present invention, Nb element and C element generate Secondary phase particle NbC, play the object of C element in regulation and control steel on the one hand, and on the other hand, the suitable Secondary phase particle be evenly distributed in steel is conducive to the isotropy controlling product.
The selection of present invention process, adopts the slab heating temperature of 1260 ~ 1320 DEG C, is mainly used in the equiblibrium mass distribution of Nb element in steel; Adopt finishing temperature and the coiling temperature of high temperature, the continuous annealing soaking insulation in conjunction with high temperature is arranged, and realizes the deep drawability that product is high; Continuous annealing adopts slow cooling 600 DEG C just to start to carry out rapid cooling later, and rapid cooling end temp is at the high temperature dot of 460-450 DEG C, mainly avoids too fast cooling to cause steel plate anisotropy to increase; Adopt the overaging section process of 430 ~ 400 DEG C to be conducive to C element distribution in steel more balanced, be conducive to obtaining isotropic characteristics; Implemented the smooth unit elongation of 1.2 ~ 1.4% by rolling load, eliminate the yield point elongation of steel plate, avoid steel plate 0 °, the r value of 45 °, 90 ° produces greatest differences, thus the isotropy product made from steel that final acquisition is desirable.
Beneficial effect of the present invention is:
Cold-rolling and punching steel yield strength 180MPa level (R of the present invention
p0.2=180 ~ 230MPa, tensile strength Rm=300 ~ 380MPa), and there is excellent deep drawability (elongation A
80mm>=36%, plastic strain ratio r
90>=1.4, work hardening exponent n
90>=0.18.), there is the feature of △ r≤0.20 simultaneously.
The present invention adopts the strand meeting Composition Control and require, hot rolling adopts high slab heating temperature, high-temperature final rolling, high temperature coiling, obtains uniform hot rolling microstructure and favourable deep-draw texture, improves the deep drawability of the finished product; The large cold rolling draft of cold rolling employing, high temperature continuous annealing, obtain deep drawability; Reduce rapid cooling speed in-15 ~-30 DEG C/s level, coordinate temperature to be the Wetted constructures of 430 ~ 400 DEG C, reach stable element and distribute in steel and the effect of solid solution C in balanced steel, acquisition isotropic characteristics; Reduce levelling machine tension force < 30 tons, and realized the smooth unit elongation of 1.0 ~ 1.4% by rolling load, eliminate the yield point elongation phenomenon of steel plate mechanical stretch test on the one hand, avoid the isotropic characteristics of large tension failure product on the other hand.
Embodiment
In order to explain the present invention better, illustrate main contents of the present invention further below in conjunction with specific embodiment, but content of the present invention is not only confined to following examples.
Embodiment 1
Planar isotropy excellent yield strength is the cold-rolling and punching steel 1 of 180MPa rank, and the raw materials by weight of cold-rolling and punching steel is: C:0.0050%, Mn:0.20%, ALs:0.04%, Nb:0.010%, Si:0.03%, P:0.010%, N:0.001%, Ti:0.006% surplus is Fe and inevitable impurity; This cold-rolling and punching steel 1 is batched by heating of plate blank, high temperature rolling, cooling, cold rolling, continuous annealing, smooth six large steps prepare, wherein,
1) in heating of plate blank process, slab soaking temperature 1280 DEG C;
2) in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 910 DEG C, rolling thickness is 3.5mm;
3) cool in coiling process, steel plate batches to 720 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to 35 DEG C, and scale on surface is removed in uncoiling pickling, implements 80% total reduction and carries out cold rolling, rolling thickness 0.7mm;
5) in continuous annealing process, annealing furnace soaking zone steel billet temperature cools after 600 DEG C fast from 820 DEG C of slow cooling, and rapid cooling section rate of cooling-15 DEG C/s, processes in overaging section after being cooled to 460 DEG C, and overaging section temperature is 420 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.2% smooth unit elongation by levelling machine rolling load.
The cold-rolling and punching R of steel 1
p0.2=205MPa, tensile strength Rm=324MPa, elongation A
80mm=39%, plastic strain ratio r
90=2.1, work hardening exponent n
90=0.19, and △ r=0.18 (≤0.20).
Embodiment 2
Planar isotropy excellent yield strength is the cold-rolling and punching steel 2 of 180MPa rank, the raw materials by weight of cold-rolling and punching steel is: C:0.0040%, Mn:0.30%, ALs:0.02%, Nb:0.020%, Si:0.013%, P:0.015%, N:0.002%, Ti:0.008%, and surplus is Fe and inevitable impurity; This cold-rolling and punching steel 2 is batched by heating of plate blank, cooling, cold rolling, high-temperature final rolling, high temperature coiling five large steps prepare, wherein,
1) in heating of plate blank process, slab soaking temperature 1260 DEG C;
2) in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 900 DEG C, rolling thickness is 4.0mm;
3) cool in coiling process, steel plate batches to 710 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 80% total reduction and carries out cold rolling, rolling thickness 0.8mm;
5) in continuous annealing process, annealing furnace soaking zone steel billet temperature cools after 600 DEG C fast from 810 DEG C of slow cooling, and rapid cooling section rate of cooling-30 DEG C/s, processes in overaging section after being cooled to 450 DEG C, and overaging section temperature is 410 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.3% smooth unit elongation by levelling machine rolling load.
The cold-rolling and punching R of steel 2
p0.2=212MPa, tensile strength Rm=329MPa, elongation A
80mm=38%, plastic strain ratio r
90=2.0, work hardening exponent n
90=0.19, and △ r=-0.12 (≤0.20).
Embodiment 3
Planar isotropy excellent yield strength is the cold-rolling and punching steel 2 of 180MPa rank, the raw materials by weight of cold-rolling and punching steel is: C:0.0060%, Mn:0.10%, ALs:0.06%, Nb:0.015%, Si:0.01%, P:0.008%, N:0.002%, Ti:0.006%, and surplus is Fe and inevitable impurity; This cold-rolling and punching steel 2 is batched by heating of plate blank, cooling, cold rolling, high-temperature final rolling, high temperature coiling five large steps prepare, wherein,
1) in heating of plate blank process, slab soaking temperature 1300 DEG C;
2) in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 910 DEG C, rolling thickness is 3.0mm;
3) cool in coiling process, steel plate batches to 730 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 80% total reduction and carries out cold rolling, rolling thickness 0.6mm;
5) in continuous annealing process, annealing furnace soaking zone steel billet temperature cools after 600 DEG C fast from 840 DEG C of slow cooling, and rapid cooling section rate of cooling-20 DEG C/s, processes in overaging section after being cooled to 450 DEG C, and overaging section temperature is 400 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.0% smooth unit elongation by levelling machine rolling load.
The cold-rolling and punching R of steel 3
p0.2=198MPa, tensile strength Rm=318MPa, elongation A
80mm=41%, plastic strain ratio r
90=2.2, work hardening exponent n
90=0.20, and △ r=0.19 (≤0.20).
Embodiment 4
Planar isotropy excellent yield strength is the cold-rolling and punching steel 4 of 180MPa rank, the raw materials by weight of cold-rolling and punching steel is: C:0.0045%, Mn:0.15%, ALs:0.05%, Nb:0.005%, Si:0.015%, P:0.005%, N:0.0011%, Ti:0.006%, and surplus is Fe and inevitable impurity; This cold-rolling and punching steel 2 is batched by heating of plate blank, cooling, cold rolling, high-temperature final rolling, high temperature coiling five large steps prepare, wherein,
1) in heating of plate blank process, slab soaking temperature 1320 DEG C;
2) in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 900 DEG C, rolling thickness is 5.0mm;
3) cool in coiling process, steel plate batches to 730 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 76% total reduction and carries out cold rolling, rolling thickness 1.2mm;
5) in continuous annealing process, annealing furnace soaking zone steel billet temperature cools after 600 DEG C fast from 830 DEG C of slow cooling, and rapid cooling section rate of cooling-25 DEG C/s, processes in overaging section after being cooled to 450 DEG C, and overaging section temperature is 400 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.4% smooth unit elongation by levelling machine rolling load.
The cold-rolling and punching R of steel 2
p0.2=208MPa, tensile strength Rm=320MPa, elongation A
80mm=40%, plastic strain ratio r
90=2.2, work hardening exponent n
90=0.18, and △ r=0.06 (≤0.20).
Embodiment 5
Planar isotropy excellent yield strength is the cold-rolling and punching steel 5 of 180MPa rank, and the raw materials by weight of cold-rolling and punching steel is: C:0.0055%, Mn:0.17%, ALs:0.035%, Nb:0.012%, Si:0.012%, P:0.008%, N:0.0018%, Ti:0.008%, surplus are Fe and inevitable impurity; This cold-rolling and punching steel 1 is batched by heating of plate blank, high temperature rolling, cooling, cold rolling, continuous annealing, smooth six large steps prepare, wherein,
1) in heating of plate blank process, slab soaking temperature 1280 DEG C;
2) in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 910 DEG C, rolling thickness is 3.5mm;
3) cool in coiling process, steel plate batches to 720 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to 35 DEG C, and scale on surface is removed in uncoiling pickling, implements 80% total reduction and carries out cold rolling, rolling thickness 0.7mm;
5) in continuous annealing process, annealing furnace soaking zone steel billet temperature cools after 600 DEG C fast from 820 DEG C of slow cooling, and rapid cooling section rate of cooling-15 DEG C/s, processes in overaging section after being cooled to 460 DEG C, and overaging section temperature is 420 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.2% smooth unit elongation by levelling machine rolling load.
The cold-rolling and punching R of steel 5
p0.2=205MPa, tensile strength Rm=324MPa, elongation A
80mm=39%, plastic strain ratio r
90=2.1, work hardening exponent n
90=0.19, and △ r=0.18 (≤0.20).
Other unspecified part is prior art.Although above-described embodiment is to invention has been detailed description; but it is only the present invention's part embodiment; instead of whole embodiment, people can also obtain other embodiments according to the present embodiment under without creative prerequisite, and these embodiments all belong to scope.
Claims (5)
1. planar isotropy excellent yield strength is a cold-rolling and punching steel for 180MPa rank, it is characterized in that: the raw materials by weight of described cold-rolling and punching steel is counted: the N < Ti of C:0.0040 ~ 0.0060%, Mn:0.10 ~ 0.30%, ALs:0.02 ~ 0.06%, Nb:0.005 ~ 0.020%, Si≤0.03%, P≤0.015%, N≤0.003%, (48/14) % and Ti < 0.010%, surplus are Fe and inevitable impurity.
2. planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa rank according to claim 1, it is characterized in that: the raw materials by weight of described cold-rolling and punching steel is counted: the N < Ti of C:0.0040 ~ 0.0060%, Mn:0.10 ~ 0.20%, ALs:0.03 ~ 0.04%, Nb:0.010 ~ 0.015%, Si:0.010 ~ 0.020%, P:0.002 ~ 0.012%, N:0.001 ~ 0.003%, (48/14) % and Ti < 0.010%, surplus are Fe and inevitable impurity.
3. planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa rank according to claim 2, it is characterized in that: the raw materials by weight of described cold-rolling and punching steel is counted:
C:0.0055%, Mn:0.17%, ALs:0.035%, Nb:0.012%, Si:0.012%, P:0.008%, N:0.0018%, Ti:0.008%, surplus are Fe and inevitable impurity.
4. according to claim 1 or 2 or 3, planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa rank, it is characterized in that: described cold-rolling and punching steel R
p0.2=180 ~ 230MPa, tensile strength Rm=300 ~ 380MPa, elongation A
80mm> 36%, plastic strain ratio r
90> 1.4, work hardening exponent n
90>=0.18 and △ r≤0.20.
5. planar isotropy excellent yield strength described in a claim 1 is the preparation method of the cold-rolling and punching steel of 180MPa rank, the method is batched by heating of plate blank, high temperature rolling, cooling, cold rolling, continuous annealing, smooth six large steps prepare cold-rolling and punching steel, wherein
1) in heating of plate blank process, slab soaking temperature 1260 ~ 1320 DEG C;
2), in high temperature rolling process, 1100 DEG C of open rollings, hot rolling finish to gauge end temp 900 ~ 930 DEG C, rolling thickness is 3.0 ~ 5.0mm
3) cool in coiling process, steel plate batches to 710 ~ 730 DEG C through water-spraying control;
4) in cold-rolled process, coil of strip naturally cools to 70 ~ room temperature, and scale on surface is removed in pickling, implements 76 ~ 80% total reductions and carries out cold rolling, rolling thickness 0.6 ~ 1.2mm;
5) in continuous annealing process, continuous annealing furnace soaking zone steel billet temperature 810 ~ 840 DEG C, cool fast after slow cooling section is cooled to 600 DEG C, rapid cooling section rate of cooling-15 ~-30 DEG C/s, process in overaging section after being cooled to 460 ~ 450 DEG C, overaging section temperature is 430 ~ 400 DEG C;
6), in formation process, the coil of strip after Wetted constructures, under unit cool to room temperature condition, reduces levelling machine tension force < 30 tons, implements 1.0 ~ 1.4% smooth unit elongation by levelling machine rolling load.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136444A (en) * | 2018-08-30 | 2019-01-04 | 唐山钢铁集团有限责任公司 | Quickly, the new energy car battery shell steel and production method of punch process is thinned |
| CN111471925A (en) * | 2020-02-17 | 2020-07-31 | 本钢板材股份有限公司 | Low-cost ultra-wide automobile outer plate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109136444A (en) * | 2018-08-30 | 2019-01-04 | 唐山钢铁集团有限责任公司 | Quickly, the new energy car battery shell steel and production method of punch process is thinned |
| CN111471925A (en) * | 2020-02-17 | 2020-07-31 | 本钢板材股份有限公司 | Low-cost ultra-wide automobile outer plate and preparation method thereof |
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