CN100447280C - Impact stage low carbon steel hot-rolled sheet and mfg. method thereof - Google Patents

Impact stage low carbon steel hot-rolled sheet and mfg. method thereof Download PDF

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Publication number
CN100447280C
CN100447280C CNB2005100128951A CN200510012895A CN100447280C CN 100447280 C CN100447280 C CN 100447280C CN B2005100128951 A CNB2005100128951 A CN B2005100128951A CN 200510012895 A CN200510012895 A CN 200510012895A CN 100447280 C CN100447280 C CN 100447280C
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temperature
sheet
rolling
finish rolling
roughing
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CN1752261A (en
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蔡大勇
瘳波
张春玲
姚枚
董海峰
赵铮铮
王志勇
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Yanshan University
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Yanshan University
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Abstract

The present invention discloses an impact stage low carbon steel hot-rolled sheet and a manufacturing method thereof. The hot-rolled sheet has good deep-drawing property, low yield strength, low yield strength ratio, good plasticity and high plastic strain ratio, and simultaneously, can be hot rolled and produced. The thickness specification of a steel sheet is 0.8 to 4mm, tensile strength is smaller than 350Mpa, yield strength is smaller than 240Mpa, extending rate is larger than 30%, an n value of a work-hardening index is 0.20 to 0.25, and an r value of the plastic strain ratio is larger than 1.0 The ingredients of the steel sheet comprise: 0.01 to 0.06% of C, at most 0.40% of Mn, at most 0.01% of S, at most 0.03% of P, at most 0.04% of Si, 0.01 to 0.05% of Al, and Fe and unavoidable impurities as the rest; simultaneously, the steel sheet contains alloy elements, such as Cr, B, Ti, Nb, etc. The sheet has the manufacturing method that a sheet blank is heated to 1100 to 1150 DEG C, and then, is rough rolled; the inlet temperature of rough rolling is 950 to 1050 DEG C; the sheet is cooled to the inlet temperature of fine rolling by water after taken out of a roughing mill; then, the sheet is fine rolled, the inlet temperature of the fine rolling is 800 to 850 DEG C, and the outlet temperature of the finish rolling is 730 to 780 DEG C. Finally, the sheet is coiled by the high temperature of 650 to 720 DEG C, or is coiled at the low temperature of 400 to 500 DEG C, and subsequently, the sheet is recrystallized and annealed at the temperature of 600 to 700 DEG C.

Description

Impact stage low carbon steel hot-rolled sheet and manufacture method thereof
Technical field
The present invention relates to a kind of metallic substance and manufacturing technology thereof with good deep drawability, relate in particular to a kind ofly have good deep drawability, low yield strength, low yield strength ratio, good plasticity, plastic strain ratio is high and the thin specification soft steel steel plate and the manufacture method thereof of can hot rolling producing.
Background technology
In recent years, ultra-thin specification (thickness is less than 1.2mm) steel plate has obtained extensive application in industries such as building, automobile and beverages, but is difficult to shut out ultra-thin steel sheet with conventional hot rolling technology at the austenite warm area.Traditional technology is cold rolling with the 70-80% aximal deformation value again after the hot rolling of austenitic area, carries out bell-type or recrystallization annealing continuously then, and the finished product that adopt this technology are cold-reduced sheets, and complex process and production cost are higher.Along with the fast development of rolling technique, producing the thin size hot-rolled band steel of this class has become possibility, and its minimum thickness is also contained in the Cold Rolled Plate Thickness scope.Because the calorific loss of thin size hot-rolled belt steel rolling process is bigger, can only be rolling under lower finishing temperature, be difficult to realize carrying out ausrolling at low temperatures, for ultra-thin specification product, may do not adopt traditional ausrolling explained hereafter.
Ferrite rolling technology is accompanied by the development of IF steel and arises at the historic moment, and this technology not only can be produced IF steel sheet cheaply, and can produce high performance cold rolling super deep-draw IF steel plate by annealing subsequently.Ferrite area is rolling to be the phase transformation controlled rolling, claims low warm mechanical controlled rolling again, is a kind of new rolling technology that development in recent years is got up.Be characterized in: roughing is carried out in the austenitic area, finishes austenite after the roughing to ferritic transformation, and finish rolling is carried out at ferrite area, and the ferrite area rolling technique is produced the hot rolling ultrathin strip in enormous quantities becomes possibility.This is that the single-phase rolling one side of low temperature improves productivity greatly because rolling temperature reduces greatly; On the other hand, the rolling band steel of ferrite area has good performance, and quality product can guarantee; Simultaneously, low slab heating temperature can reduce whole operation of rolling energy consumption, saves cost, also can reduce iron scale to improve lumber recovery.At present, the advantage of ferrite rolling technology only only limits to the IF steel, and The experimental results shows, when adopting ferrite rolling explained hereafter latten on soft steel, the mechanical property of thin plate and forming property are very undesirable, even do not reach the level of pair rolling steel plate.So, develop a kind of soft steel that ferrite rolling technology latten is produced that is suitable for, have important and practical meanings.
Summary of the invention
First purpose of the present invention is to provide a kind of have good deep drawability, low yield strength, low yield strength ratio, good plasticity, mild steel sheet that plastic strain ratio r is high;
Second purpose of the present invention is to provide alloying processing method, thereby makes soft steel have rational dynamic strain aging behavior and mechanical property, ensures good deep drawability;
The 3rd purpose of the present invention is to overcome the weakness of existing mild steel sheet complex manufacturing, and realizing provides a kind of manufacturing to have the hot rolling technology method of reasonable mechanical property and forming property mild steel sheet (the thickness specification is 0.8-4mm) with hot Dai Leng.
The technical solution adopted for the present invention to solve the technical problems is:
A kind ofly have good deep drawability, low yield strength, low yield strength ratio, good plasticity, plastic strain ratio is high and the thin specification soft steel steel plate can hot rolling produced, steel plate thickness specification is 0.8-4mm, tensile strength is less than 350MPa, yield strength is less than 240MPa, unit elongation is greater than 30%, work hardening exponent n value is 0.20-0.25, and plastic strain ratio r value is greater than 1.0.
Contain in the described steel plate composition:
C:0.01-0.06%,Mn:≤0.40%,S:≤0.01%,P:≤0.03%,Si:≤0.04%,Al:0.01-0.05%,Cr:1.0-1.5%;
Surplus is Fe and unavoidable impurities;
More than be mass percent.
The present invention obtains the manufacture method of above-mentioned impact stage low carbon steel hot-rolled sheet, may further comprise the steps:
(1) slab is heated to 1100-1150 ℃, carries out roughing then, the roughing mill inlet temperature is 950-1050 ℃;
(2) go out roughing mill after water-cooled to the finish rolling temperature in; Carry out finish rolling then, the finishing mill temperature in is 800-850 ℃; The finish rolling temperature out is 730-800 ℃;
(3) batch after the finish rolling, coiling temperature is 650-720 ℃;
Further,, hot rolling slab can be reheated to the holding temperature interval, also continuously cast bloom directly can be cooled to the said temperature interval in step (1) according to method of the present invention; Roughing can be adopted single pass, also can adopt multi-pass;
The total preferred 70-90% of draft of step (2);
Also can not be divided into roughing and finish rolling in the whole operation of rolling, rolling temperature thick, the finish rolling temperature in and the finish rolling temperature out of (1) and step (2) is set by step formulated.
Again, a kind ofly have good deep drawability, low yield strength, low yield strength ratio, good plasticity, plastic strain ratio is higher and the thin specification soft steel steel plate can hot rolling produced, steel plate thickness specification is 0.8-4mm, tensile strength is less than 350MPa, yield strength is less than 240MPa, unit elongation is greater than 30%, and work hardening exponent n value is 0.20-0.25, and plastic strain ratio r value is greater than 1.0.
Contain in the described steel plate composition:
C:0.01-0.06%;Mn:≤0.40%;S:≤0.01%;P:≤0.03%;Si:≤0.04%;Al:0.01-0.05%;
More than be mass percent;
Wherein, further contain following element:
Cr:0.3-1.0%;
Further contain at least a following interpolation element that is selected from:
B:0.001-0.005%,Ti:0.01-0.03%;Nb:0.01-0.03%
The present invention obtains the manufacture method of above-mentioned impact stage low carbon steel hot-rolled sheet, may further comprise the steps:
(1) slab is heated to 1100-1150 ℃, carries out roughing then, the roughing mill inlet temperature is 950-1050 ℃;
(2) go out roughing mill after water-cooled to the finish rolling temperature in, carry out finish rolling then, the finishing mill temperature in is 800-850 ℃; The finish rolling temperature out is 730-800 ℃;
(3) batch after the finish rolling, coiling temperature is 400-500 ℃;
(4) last, carry out recrystallization annealing, annealing temperature is 600-700 ℃;
Further,, hot rolling slab can be reheated to the holding temperature interval, also continuously cast bloom directly can be cooled to the said temperature interval in step (1) according to method of the present invention; Roughing can be adopted single pass, also can adopt multi-pass;
The total preferred 70-90% of draft of step (2);
Also can not be divided into roughing and finish rolling in the whole operation of rolling, rolling temperature thick, the finish rolling temperature in and the finish rolling temperature out of (1) and step (2) is set by step formulated.
Utilize method of the present invention, can produce the low and plasticity of yield strength, yield tensile ratio, soft steel latten that plastic strain ratio is high, the sheet gauge specification is 0.8-4mm, and hot-rolled sheet has good forming property, and plastic strain ratio r value is greater than 1.0.
Embodiment
Embodiment 1
Implementation process is carried out on continuous casting and rolling production line, and alloying constituent is: C:0.04%; Mn:0.30%; S:0.005%; P:0.01%; Si:0.02%; Al:0.03%; Cr:0.8%; B:0.004%.At first, block on continuous caster, stove is heated to 1100 ℃ at the bottom of roller; Carry out two passage roughing then, the roughing inlet temperature is 980 ℃, and laminar flow cooled off after steel billet went out roughing mill, carried out five passage finish rolling again, and the finishing mill inlet temperature is 820 ℃, and temperature out is 750 ℃; Final high temperature batches, and coiling temperature is 680 ℃.Final latten thickness is 1.2mm.
The mechanical property of gained latten is as follows: tensile strength 320MPa, and yield strength 220MPa, unit elongation 32%, work hardening exponent n value is 0.24, plastic strain ratio r value is 1.2.
Embodiment 2
Implementation process is carried out on continuous casting and rolling production line, and alloying constituent is: C:0.03%; Mn:0.28%; S:0.005%; P:0.01%; Si:0.03%; Al:0.04%; Cr:1.3%.At first, block on continuous caster, stove is heated to 1100 ℃ at the bottom of roller; Carry out two passage roughing then, the roughing inlet temperature is 980 ℃, and laminar flow cooled off after steel billet went out roughing mill, carried out five passage finish rolling again, and the finishing mill inlet temperature is 820 ℃, and temperature out is 750 ℃; Final high temperature batches, and coiling temperature is 680 ℃.Final latten thickness is 1.2mm.
The mechanical property of gained latten is as follows: tensile strength 325MPa, and yield strength 230MPa, unit elongation 33%, work hardening exponent n value is 0.23, plastic strain ratio r value is 1.1.
Embodiment 3
Implementation process is carried out on continuous casting and rolling production line, and alloying constituent is: C:0.04%; Mn:0.28%; S:0.005%; P:0.01%; Si:0.02%; Al:0.04%; Cr:0.5%; B:0.003%; Ti:0.02%.At first, block on continuous caster, stove is heated to 1100 ℃ at the bottom of roller; Carry out two passage roughing then, the roughing inlet temperature is 980 ℃, and laminar flow cooled off after steel billet went out roughing mill, carried out five passage finish rolling again, and the finishing mill inlet temperature is 820 ℃, and temperature out is 750 ℃; Final high temperature batches, and coiling temperature is 680 ℃.Final latten thickness is 1.2mm.
The mechanical property of gained latten is as follows: tensile strength 315MPa, and yield strength 210MPa, unit elongation 35%, work hardening exponent n value is 0.24, plastic strain ratio r value is 1.2.
Embodiment 4
Implementation process is carried out on continuous casting and rolling production line, and alloying constituent is: C:0.03%; Mn:0.20%; S:0.005%; P:0.01%; Si:0.03%; Al:0.02%; Cr:0.5%; B:0.003%; Nb:0.02%.At first, block on continuous caster, stove is heated to 1100 ℃ at the bottom of roller; Carry out two passage roughing then, the roughing inlet temperature is 980 ℃, and laminar flow cooled off after steel billet went out roughing mill, carried out five passage finish rolling again, and the finishing mill inlet temperature is 820 ℃, and temperature out is 750 ℃; Final high temperature batches, and coiling temperature is 680 ℃.Final latten thickness is 1.2mm.
The mechanical property of gained latten is as follows: tensile strength 320MPa, and yield strength 215MPa, unit elongation 34%, work hardening exponent n value is 0.23, plastic strain ratio r value is 1.1.
Embodiment 5
Implementation process is carried out on continuous casting and rolling production line, and alloying constituent is: C:0.04%; Mn:0.30%; S:0.005%; P:0.01%; Si:0.02%; Al:0.03%; Cr:0.8%; B:0.004%.At first, block on continuous caster, stove is heated to 1100 ℃ at the bottom of roller; Carry out two passage roughing then, the roughing inlet temperature is 980 ℃, and laminar flow cooled off after steel billet went out roughing mill, carried out five passage finish rolling again, and the finishing mill inlet temperature is 800 ℃, and temperature out is 750 ℃; Final high temperature batches, and coiling temperature is 700 ℃.Final latten thickness is 1.2mm.
The mechanical property of gained latten is as follows: tensile strength 310MPa, and yield strength 210MPa, unit elongation 35%, work hardening exponent n value is 0.23, plastic strain ratio r value is 1.3.

Claims (3)

1. the manufacture method of an impact stage low carbon steel hot-rolled sheet, the composition of described steel plate is (mass percent): C:0.01-0.06%, Mn :≤0.40%, S :≤0.01%, P :≤0.03%, Si :≤0.04%, Al:0.01-0.05%, Cr:1.0-1.5%, surplus is Fe and unavoidable impurities, it is characterized in that: may further comprise the steps:
(1) slab is heated to 1100-1150 ℃, carries out roughing then, the roughing inlet temperature is 950-1050 ℃;
(2) go out roughing mill after water-cooled to the finish rolling temperature in; Carry out finish rolling then, the finish rolling temperature in is 800-850 ℃; The finish rolling temperature out is 730-800 ℃; Total draft 70-90%;
(3) batch after the finish rolling, coiling temperature is 680-720 ℃.
2. the manufacture method of impact stage low carbon steel hot-rolled sheet according to claim 1 is characterized in that, wherein in step (1), hot rolling slab reheats to 1100-1150 ℃, or continuously cast bloom directly is cooled to the said temperature interval; Single pass or multi-pass are adopted in roughing.
3. the manufacture method of impact stage low carbon steel hot-rolled sheet according to claim 1 and 2, it is characterized in that, be not divided into roughing and finish rolling in the whole operation of rolling, rolling temperature thick, the finish rolling temperature in and the finish rolling temperature out of (1) and step (2) is set by step determined.
CNB2005100128951A 2005-10-10 2005-10-10 Impact stage low carbon steel hot-rolled sheet and mfg. method thereof Expired - Fee Related CN100447280C (en)

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EP1918406B1 (en) * 2006-10-30 2009-05-27 ThyssenKrupp Steel AG Process for manufacturing steel flat products from boron microalloyed multi phase steel
CN102021493A (en) * 2009-09-21 2011-04-20 宝山钢铁股份有限公司 Hot rolled steel plate for precision stamping and manufacturing method thereof
JP5549232B2 (en) * 2010-01-15 2014-07-16 Jfeスチール株式会社 Cold rolled steel sheet and method for producing the same
CN103878178B (en) * 2014-03-04 2015-12-09 河北钢铁股份有限公司唐山分公司 CSP produces the method for ultrathin hot rolled coiled sheet
WO2017006144A1 (en) * 2015-07-09 2017-01-12 Arcelormittal Steel for press hardening and press hardened part manufactured from such steel
CN106282796B (en) * 2016-08-30 2018-03-27 日照钢铁控股集团有限公司 Based on ESP thin plates endless rolling production door industry, the method for elevator steel
CN106498284A (en) * 2016-11-08 2017-03-15 攀钢集团攀枝花钢铁研究院有限公司 A kind of production method of ultra-deep punching with hot continuous rolling pickling steel band
CN109972045A (en) * 2019-03-19 2019-07-05 首钢集团有限公司 A kind of thin gauge mild steel and its manufacturing method
CN110284068B (en) * 2019-07-29 2021-03-09 武汉钢铁有限公司 Preparation method of deep-drawing hot-rolled steel plate
CN110284067A (en) * 2019-07-29 2019-09-27 武汉钢铁有限公司 A kind of preparation method for exempting from pickling deep-draw hot rolled steel plate
CN111334716B (en) * 2020-03-25 2021-04-13 江西理工大学 Chromium-titanium-boron-containing low-carbon high-strength deep drawing steel and preparation method and application thereof
CN112676341A (en) * 2020-12-03 2021-04-20 攀钢集团攀枝花钢铁研究院有限公司 Hot rolling method of low-carbon steel

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Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09263880A (en) * 1996-03-28 1997-10-07 Kawasaki Steel Corp Cold rolled steel sheet excellent in aging resistance

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