CN105483537B - Planar isotropy excellent yield strength is the cold-rolling and punching steel and its manufacturing method of 180MPa ranks - Google Patents
Planar isotropy excellent yield strength is the cold-rolling and punching steel and its manufacturing method of 180MPa ranks 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 a kind of cold-rolling and punching steel that planar isotropy is excellent and its manufacturing method, which is applied to automobile interior exterior portion covering.It is characterized in that：The raw material of the cold-rolling and punching steel is by weight percentage：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%, the N ＜ Ti and Ti ＜ 0.010% of (48/14) %, surplus are Fe and inevitable impurity.180MPa grades of the steel yield strength of cold-rolling and punching of the present invention, and there is excellent deep drawability, while having the characteristics that r≤0.20 △.
Description
Technical field
The present invention is in particular to a kind of cold-rolling and punching steel that planar isotropy is excellent and its manufacturing method, cold rolling punching
Pressure steel is applied to automobile interior exterior portion covering.
Background technology
Isotropic steel (IS, isotropy stee1) has low △ r values (△ r：(r0+r90-2r45)/2) the characteristics of, at
Material steady flow and mutually coordinated in all directions, is conducive to obtain good formability, particularly with punching when shape
Compression cup shape object, wall thickness reduction uniformly and ear very little processed, are chiefly used in the punching of battery case class, automobile exterior panel part.Currently, have each
To same sex characteristic product mainly use 0.01~0.05%C design, yield strength 220MPa ranks, 260MPa ranks and
300MPa ranks cannot be satisfied part and shape increasingly complex part punching.It needs a kind of deep drawability excellent, while having again
The steel plate for having planar isotropy excellent meets the use of the automobile panel of complicated forming.
Currently, cold rolling isotropic characteristics steel plate yield strength is in 220MPa ranks, 260MPa ranks, 300MPa ranks.
Invention content
The technical problems to be solved by the invention be just to provide a kind of cold-rolling and punching steel that planar isotropy is excellent and
Its manufacturing method, the yield strength that the present invention is prepared, which is the cold-rolling and punching steel of 180MPa ranks, has isotropic characteristic
Cold-rolled products, punching performance is excellent, meets the use of the automobile panel of complicated forming.
To achieve the above object, a kind of planar isotropy excellent yield strength provided by the invention is 180MPa ranks
The raw material of cold-rolling and punching steel, the cold-rolling and punching steel is by weight percentage：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%, the N ＜ Ti and Ti ＜ 0.010% of (48/14) %, surplus are Fe and inevitable impurity.
Further, the raw material of the cold-rolling and punching steel is by weight percentage：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%, the N ＜ Ti and Ti ＜ 0.010% of (48/14) %, surplus are for Fe and unavoidably
Impurity.
Still further, the raw material of the cold-rolling and punching steel is by weight percentage：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
For Fe and inevitable impurity.
Still further, cold-rolling and punching steel Rp0.2=180~230MPa, tensile strength Rm=300~380MPa,
Elongation A80mm>=36%, plastic strain ratio r90>=1.4, work hardening index n90R≤0.20 >=0.18 and △.
The present invention also provides the cold-rolling and punching steel that a kind of planar isotropy excellent yield strength is 180MPa ranks
Preparation method, this method by heating of plate blank, high temperature rolling, it is cooling batch, cold rolling, continuous annealing, smooth six big steps
Prepare cold-rolling and punching steel, wherein
1) during heating of plate blank, 1260~1320 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 900~930 DEG C of hot rolling finish to gauge end temp, rolling thickness 3.0
~5.0mm
3) in cooling coiling process, steel plate is batched through water-spraying control to 710~730 DEG C；
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 reduction carries out cold rolling, 0.6~1.2mm of rolling thickness；
5) it during continuous annealing, in 810~840 DEG C of continuous annealing furnace soaking zone steel billet temperature, is cooled in slow cooling section
Be quickly cooled down after 600 DEG C, rapid cooling section -15~-30 DEG C/s of cooling rate, after being cooled to 460~450 DEG C overaging section into
Row processing, overaging section temperature are 430~400 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.0~1.4% smooth elongation percentage by planisher roll-force.
The selection of the raw material of the present invention
The C content of the present invention reduces (compared with mild steel), improves plasticity；Ensure C appropriate in steel, two are combined into Nb, Ti
Phase particle is conducive to the isotropism for controlling steel.
The present invention adds Mn elements of low cost, plays the role of solution strengthening in steel, controls the intensity of steel.
S is harmful element in deep punching steel in the present invention, forms MnS, TiS sulfides in steel, should avoid S content mistakes
Height, P are used as control of deleterious element in this steel.
Al is added as deoxidier in deep punching steel in the present invention, and purpose is dissolved in when mainly removing smelting in molten steel
Oxygen, in addition aluminium can inhibit solid solution of the nitrogen in ferrite as determine nitrogen agent, eliminate strain-aging, raising low-temperature flexibility.
The negative effect of N is to cause steel plate surrender effect and strain-aging in the present invention, by the content of less N element,
Stablized with steel sheet performance.
The present invention adds the N element that micro Ti elements are mainly used in fixed steel, according to 0.010% ＞ Ti ＞ (48/
14) N% carries out the additive amount of control Ti.
Nb elements generate Secondary phase particle NbC with C element in the present invention, on the one hand play the purpose of C element in regulation and control steel, separately
On the one hand, the Secondary phase particle appropriate being evenly distributed in steel is conducive to control the isotropism of product.
The selection of present invention process is mainly used for Nb elements in steel using 1260~1320 DEG C of slab heating temperature
Equiblibrium mass distribution；Using the finishing temperature and coiling temperature of high temperature, setting is kept the temperature in conjunction with the continuous annealing soaking of high temperature, realizes product
High deep drawability；Continuous annealing just proceeds by rapid cooling later using 600 DEG C of slow cooling, and rapid cooling end temp is in 460-450
DEG C high temperature dot, mainly avoid too fast cooling cause steel plate anisotropy increase；Using 430~400 DEG C of overaging section
It is more balanced that processing is conducive in steel C element distribution, is conducive to acquisition isotropic characteristics；By roll-force implement 1.2~
1.4% smooth elongation percentage, eliminates the yield point elongation of steel plate, avoid 0 ° of steel plate, 45 °, 90 ° of r values generate greatest differences, from
And finally obtain ideal isotropism steel product.
The beneficial effects of the present invention are：
Cold-rolling and punching 180MPa grades of (R of steel yield strength of the present inventionp0.2=180~230MPa, tensile strength Rm=
300~380MPa), and there is excellent deep drawability (elongation A80mm>=36%, plastic strain ratio r90>=1.4, processing hardening
Index n90≥0.18.), while having the characteristics that r≤0.20 △.
The present invention is using the strand for meeting Composition Control requirement, and hot rolling is using high slab heating temperature, high-temperature final rolling, height
Warm rolling takes, and obtains uniform hot rolling microstructure and advantageous deep-draw texture, improves the deep drawability of final products；Cold rolling uses big cold rolling
Reduction ratio, high temperature continuous annealing obtain deep drawability；Rapid cooling rate is reduced in -15~-30 DEG C/s levels, cooperation temperature is 430
~400 DEG C of Wetted constructures have the function that stable element is distributed in steel and are dissolved C in balanced steel, obtain isotropism
Characteristic；30 tons of planisher tension ＜ is reduced, and realizes 1.0~1.4% smooth elongation percentage by roll-force, on the one hand eliminates steel
The yield point elongation phenomenon of plate mechanical stretch experiment, on the other hand avoids the isotropic characteristics of big tension failure product.
Specific implementation mode
In order to preferably explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
Present disclosure is not limited solely to following embodiment.
Embodiment 1
Planar isotropy excellent yield strength is the cold-rolling and punching steel 1 of 180MPa ranks, the original of cold-rolling and punching steel
Material be by weight percentage：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；The cold-rolling and punching steel 1 is added by slab
Heat, high temperature rolling, it is cooling batch, cold rolling, continuous annealing, smooth six big steps are prepared, wherein
1) during heating of plate blank, 1280 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 910 DEG C of hot rolling finish to gauge end temp, rolling thickness 3.5mm；
3) in cooling coiling process, steel plate is batched through water-spraying control to 720 DEG C；
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% stagnation pressure
Lower rate carries out cold rolling, rolling thickness 0.7mm；
5) during continuous annealing, annealing furnace soaking zone steel billet temperature is quickly cold from 820 DEG C of slow cooling to progress after 600 DEG C
But, -15 DEG C of rapid cooling section cooling rate/s is handled after being cooled to 460 DEG C in overaging section, and overaging section temperature is 420 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.2% smooth elongation percentage by planisher roll-force.
The R of cold-rolling and punching steel 1p0.2=205MPa, tensile strength Rm=324MPa, elongation A80mm=39%, plasticity is answered
No-load voltage ratio r90=2.1, work hardening index n90=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 ranks, the original of cold-rolling and punching steel
Material be by weight percentage：C：0.0040%, Mn：0.30%, ALs：0.02%, Nb：0.020%, Si：0.013%, P：
0.015%, N：0.002%, Ti：0.008%, surplus is Fe and inevitable impurity；The cold-rolling and punching steel 2 is added by slab
Heat, it is cooling batch, cold rolling, high-temperature final rolling, high temperature coiling five big steps be prepared, wherein
1) during heating of plate blank, 1260 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 900 DEG C of hot rolling finish to gauge end temp, rolling thickness 4.0mm；
3) in cooling coiling process, steel plate is batched through water-spraying control to 710 DEG C；
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 80% stagnation pressure
Lower rate carries out cold rolling, rolling thickness 0.8mm；
5) during continuous annealing, annealing furnace soaking zone steel billet temperature is quickly cold from 810 DEG C of slow cooling to progress after 600 DEG C
But, -30 DEG C of rapid cooling section cooling rate/s is handled after being cooled to 450 DEG C in overaging section, and overaging section temperature is 410 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.3% smooth elongation percentage by planisher roll-force.
The R of cold-rolling and punching steel 2p0.2=212MPa, tensile strength Rm=329MPa, elongation A80mm=38%, plasticity is answered
No-load voltage ratio r90=2.0, work hardening index n90=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 ranks, the original of cold-rolling and punching steel
Material be by weight percentage：C：0.0060%, Mn：0.10%, ALs：0.06%, Nb：0.015%, Si：0.01%, P：
0.008%, N：0.002%, Ti：0.006%, surplus is Fe and inevitable impurity；The cold-rolling and punching steel 2 is added by slab
Heat, it is cooling batch, cold rolling, high-temperature final rolling, high temperature coiling five big steps be prepared, wherein
1) during heating of plate blank, 1300 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 910 DEG C of hot rolling finish to gauge end temp, rolling thickness 3.0mm；
3) in cooling coiling process, steel plate is batched through water-spraying control to 730 DEG C；
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 80% stagnation pressure
Lower rate carries out cold rolling, rolling thickness 0.6mm；
5) during continuous annealing, annealing furnace soaking zone steel billet temperature is quickly cold from 840 DEG C of slow cooling to progress after 600 DEG C
But, -20 DEG C of rapid cooling section cooling rate/s is handled after being cooled to 450 DEG C in overaging section, and overaging section temperature is 400 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.0% smooth elongation percentage by planisher roll-force.
The R of cold-rolling and punching steel 3p0.2=198MPa, tensile strength Rm=318MPa, elongation A80mm=41%, plasticity is answered
No-load voltage ratio r90=2.2, work hardening index n90=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 ranks, the original of cold-rolling and punching steel
Material be by weight percentage：C：0.0045%, Mn：0.15%, ALs：0.05%, Nb：0.005%, Si：0.015%, P：
0.005%, N：0.0011%, Ti：0.006%, surplus is Fe and inevitable impurity；The cold-rolling and punching steel 2 passes through slab
Heating, it is cooling batch, cold rolling, high-temperature final rolling, high temperature coiling five big steps be prepared, wherein
1) during heating of plate blank, 1320 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 900 DEG C of hot rolling finish to gauge end temp, rolling thickness 5.0mm；
3) in cooling coiling process, steel plate is batched through water-spraying control to 730 DEG C；
4) in cold-rolled process, coil of strip naturally cools to room temperature, and scale on surface is removed in uncoiling pickling, implements 76% stagnation pressure
Lower rate carries out cold rolling, rolling thickness 1.2mm；
5) during continuous annealing, annealing furnace soaking zone steel billet temperature is quickly cold from 830 DEG C of slow cooling to progress after 600 DEG C
But, -25 DEG C of rapid cooling section cooling rate/s is handled after being cooled to 450 DEG C in overaging section, and overaging section temperature is 400 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.4% smooth elongation percentage by planisher roll-force.
The R of cold-rolling and punching steel 2p0.2=208MPa, tensile strength Rm=320MPa, elongation A80mm=40%, plasticity is answered
No-load voltage ratio r90=2.2, work hardening index n90=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 ranks, the original of cold-rolling and punching steel
Material be by weight percentage：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 is Fe and inevitable impurity；The cold-rolling and punching steel 1 passes through slab
Heating, high temperature rolling, it is cooling batch, cold rolling, continuous annealing, smooth six big steps are prepared, wherein
1) during heating of plate blank, 1280 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 910 DEG C of hot rolling finish to gauge end temp, rolling thickness 3.5mm；
3) in cooling coiling process, steel plate is batched through water-spraying control to 720 DEG C；
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% stagnation pressure
Lower rate carries out cold rolling, rolling thickness 0.7mm；
5) during continuous annealing, annealing furnace soaking zone steel billet temperature is quickly cold from 820 DEG C of slow cooling to progress after 600 DEG C
But, -15 DEG C of rapid cooling section cooling rate/s is handled after being cooled to 460 DEG C in overaging section, and overaging section temperature is 420 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher
30 tons of power ＜ implements 1.2% smooth elongation percentage by planisher roll-force.
The R of cold-rolling and punching steel 5p0.2=205MPa, tensile strength Rm=324MPa, elongation A80mm=39%, plasticity is answered
No-load voltage ratio r90=2.1, work hardening index n90=0.19, and △ r=0.18 (≤0.20).
Other unspecified parts are the prior art.Although above-described embodiment is made that the present invention and retouches in detail
State, but it is only a part of the embodiment of the present invention, rather than whole embodiments, people can also according to the present embodiment without
Other embodiment is obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (4)
1. a kind of planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa ranks, the cold-rolling and punching steel
Raw material be by weight percentage：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%, the N ＜ Ti of (48/14) % and Ti ＜
0.010%, surplus is Fe and inevitable impurity；Cold-rolling and punching steel Rp0.2=180~230MPa, tensile strength Rm=
300~380MPa, elongation A80mm＞ 36%, plastic strain ratio r90＞ 1.4, work hardening index n90>=0.18 and △ r≤
0.20, the cold-rolling and punching steel by heating of plate blank, high temperature rolling, it is cooling batch, it is cold rolling, continuous annealing, smooth six big
Step is prepared, it is characterised in that：
1) during heating of plate blank, 1260~1320 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 900~930 DEG C of hot rolling finish to gauge end temp, rolling thickness be 3.0~
5.0mm
3) in cooling coiling process, steel plate is batched through water-spraying control to 710~730 DEG C；
4) in cold-rolled process, coil of strip naturally cools to 70 DEG C~room temperature, and scale on surface is removed in pickling, and it is total to implement 76~80%
Reduction ratio carries out cold rolling, 0.6~1.2mm of rolling thickness；
5) during continuous annealing, in 810~840 DEG C of continuous annealing furnace soaking zone steel billet temperature, 600 DEG C are cooled in slow cooling section
After be quickly cooled down, rapid cooling section -15~-30 DEG C/s of cooling rate, after being cooled to 460~450 DEG C at overaging section
Reason, overaging section temperature are 430~400 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher tension ＜
30 tons, 1.0~1.4% smooth elongation percentage are implemented by planisher roll-force.
2. planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa ranks according to claim 1,
It is characterized in that：The raw material of the cold-rolling and punching steel is by weight percentage：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%, the N ＜ Ti and Ti ＜ 0.010% of (48/14) %, surplus are Fe and inevitable impurity.
3. planar isotropy excellent yield strength is the cold-rolling and punching steel of 180MPa ranks according to claim 2,
It is characterized in that：The raw material of the cold-rolling and punching steel is by weight percentage：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 is Fe and can not
Avoid impurity.
4. planar isotropy excellent yield strength described in a kind of claim 1 is the system of the cold-rolling and punching steel of 180MPa ranks
Preparation Method, this method by heating of plate blank, high temperature rolling, it is cooling batch, it is prepared by cold rolling, continuous annealing, smooth six big steps
Cold-rolling and punching steel, wherein
1) during heating of plate blank, 1260~1320 DEG C of slab soaking temperature；
2) during high temperature rolling, 1100 DEG C of open rollings, 900~930 DEG C of hot rolling finish to gauge end temp, rolling thickness be 3.0~
5.0mm
3) in cooling coiling process, steel plate is batched through water-spraying control to 710~730 DEG C；
4) in cold-rolled process, coil of strip naturally cools to 70 DEG C~room temperature, and scale on surface is removed in pickling, and it is total to implement 76~80%
Reduction ratio carries out cold rolling, 0.6~1.2mm of rolling thickness；
5) during continuous annealing, in 810~840 DEG C of continuous annealing furnace soaking zone steel billet temperature, 600 DEG C are cooled in slow cooling section
After be quickly cooled down, rapid cooling section -15~-30 DEG C/s of cooling rate, after being cooled to 460~450 DEG C at overaging section
Reason, overaging section temperature are 430~400 DEG C；
6) in formation process, the coil of strip after Wetted constructures is cooled under room temperature by unit, reduces planisher tension ＜
30 tons, 1.0~1.4% smooth elongation percentage are implemented by planisher roll-force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510907081.8A CN105483537B (en) | 2015-12-09 | 2015-12-09 | Planar isotropy excellent yield strength is the cold-rolling and punching steel and its manufacturing method of 180MPa ranks |
Applications Claiming Priority (1)
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