CN106834915B - The processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness - Google Patents

The processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness Download PDF

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Publication number
CN106834915B
CN106834915B CN201611113787.8A CN201611113787A CN106834915B CN 106834915 B CN106834915 B CN 106834915B CN 201611113787 A CN201611113787 A CN 201611113787A CN 106834915 B CN106834915 B CN 106834915B
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temperature
cooling
finish rolling
slab
steel
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CN106834915A (en
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张秀飞
郭冬青
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The invention discloses a kind of processing methods of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness, including:Smelting, continuous casting, reheating process, roughing, finish rolling, strip is cooling and batches.Using strip produced by the invention, there is moderate yield tensile ratio and well processed forming property, be suitable for the needs of the materials such as car spoke.

Description

The processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness
Technical field
The present invention relates to a kind of hot rolling cold machine-shaping technologies of steel plate, specifically, are related to one kind 2~4mm thickness 800MPa The processing method of grade hot-rolled dual-phase steel
Background technology
With the development of China's automotive light weight technology, the demand to high-strength steel is increasing, for the automobile zero that forming is complicated The promotion of component, intensity often leads to the difficulty shaped.Wheel-use steel material intensity is generally at 330~600MPa grades at present, 800MPa grades of hot-rolled dual-phase steels can be used for the production of more high-strength wheel rim flange ring, be conducive to the loss of weight and automobile of steel-spoke material Lightweight.The 800MPa grades of hot-rolled dual-phase steel strengths of materials are high, and yield tensile ratio is moderate, are conducive to complicated cold machine-shaping.800MPa Grade hot-rolled dual-phase steel production difficulty is big, especially requires crucial cooling technique high, the production bad solution of problem.High intensity is double Phase steel high financial profit, it is contemplated that about 400 yuan of ton steel benefit or more.
Invention content
Technical problem solved by the invention is to provide a kind of processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness, The strip of production has moderate yield tensile ratio and well processed forming property, is suitable for the needs of the materials such as car spoke.
Technical solution is as follows:
A kind of processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness, including:
Roughing and finish rolling;The finishing temperature of start rolling temperature >=950 DEG C of finish rolling, finish rolling is 830~860 DEG C;
Strip is cooling and batches;Cooling to use section cooling equipment, sub-sectional cooling pattern, first segment cooling velocity is 35 DEG C/s, medium temperature is 630~650 DEG C, and air cooling time is 5~6s, and the temperature batched is 100~180 DEG C;Finished chemical at Point mass percentage include:C:0.065-0.085%, Si:0.45-0.55%, Mn:1.45-1.60%, P:≤ 0.020%, S≤0.010%, Cr:0.35-0.45%, Nb:0.035~0.045%, surplus is Fe and impurity.
Further:Further include smelting, continuous casting and reheating process;During reheating, slab is packed into reheating stove heat, control Time inside furnace processed, 1260 ± 20 DEG C of tapping temperature.
Further:Roughing uses 2 machine frame rolling mill roughing, finish rolling to use 7 rack continuously variable crown milling train finish rolling.
Further:Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained steel using top and bottom combined blown converter smelting Water, converter smelting whole process Argon, 1650 DEG C of Tapping Temperature of Bof;Then molten steel after converter smelting is subjected to LF external refinings, essence Refine temperature >=1560 DEG C in place, 25 DEG C of the sheet billet continuous casting degree of superheat;Slab cleaning, slow cooling and continuous casting are carried out later;Heating of plate blank temperature Degree is 1240 DEG C, and the time of heating is 220min, the slab after heating is carried out high pressure water dephosphorization, fixed-width pressure machine fixed width is adopted With 2 rack roughing, 7 rack continuously variable crown milling train finish rolling, 1020 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 830 DEG C; Section cooling uses two-stage cooling, 35 DEG C/s of first segment cooling velocity, steel band to be reduced to 630 DEG C by first segment cooling, so Air-cooled afterwards, time 5s, about 100 DEG C/s of second segment cooling velocity, temperature of steel strips are reduced to 120 DEG C and batch.
Further:Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained steel using top and bottom combined blown converter smelting Water, converter smelting whole process Argon, 1650 DEG C of Tapping Temperature of Bof;Then molten steel after converter smelting is subjected to LF external refinings, essence Refine temperature >=1560 DEG C in place, 25 DEG C of the sheet billet continuous casting degree of superheat;Slab cleaning, slow cooling and continuous casting are carried out later;Heating of plate blank temperature Degree is 1260 DEG C, and the time of heating is 220min, the slab after heating is carried out high pressure water dephosphorization, fixed-width pressure machine fixed width is adopted With 2 rack roughing, 7 rack continuously variable crown milling train finish rolling, 1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 840 DEG C; Section cooling uses two-stage cooling, 35 DEG C/s of first segment cooling velocity, steel band to be reduced to 640 DEG C by first segment cooling, so Air-cooled afterwards, time 6s, about 100 DEG C/s of second segment cooling velocity, temperature of steel strips are reduced to 150 DEG C and batch.
Further:Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained steel using top and bottom combined blown converter smelting Converter, 1650 DEG C of Tapping Temperature of Bof is added in water, converter smelting whole process Argon, steel scrap;Then molten steel after converter smelting is carried out LF external refinings refine temperature >=1560 DEG C in place, 25 DEG C of the sheet billet continuous casting degree of superheat;Slab cleaning, slow cooling and company are carried out later Casting;Slab heating temperature is 1280 DEG C, and the time of heating is 240min, and the slab after heating is carried out high pressure water dephosphorization, fixed width Forcing press fixed width;Using 2 rack roughing, 7 rack continuously variable crown milling train finish rolling, 1030 DEG C of finish rolling start rolling temperature, finish rolling finish to gauge Temperature is 840 DEG C;Section cooling uses two-stage cooling, and 35 DEG C/s of first segment cooling velocity, steel band is by first segment cooling drop Then air-cooled as low as 650 DEG C, time 6s, about 100 DEG C/s of second segment cooling velocity, temperature of steel strips are reduced to 180 DEG C and batch.
Compared with prior art, the technology of the present invention effect includes:
1, steel band microscopic structure feature produced by the invention is ferrite+martensite, is yield tensile ratio the characteristics of mechanical property Low, stress strain curve is continuously surrendered, and has favorable forming property, and being suitable for the complicated material formed such as high intensity car spoke needs It wants.
2,800MPa grades of hot-rolled dual-phase steel steel band yield strength distributions of 2~4mm of the invention are in 480MPa~580MPa Between, tensile strength is distributed between 780MPa~880MPa, and elongation percentage A50 is distributed between 22%~28%, yield tensile ratio YS/TS is between 0.60~0.75.
3, remarkable in economical benefits.
The present invention is suitable for traditional hot-continuous-rolling strip steel production line, 800MPa grades of hot-rolled dual-phase steels of 2~4mm, production cost compared with It is low, relative to common iron, it is contemplated that ton steel can about 600 yuan of synergy or more.
Description of the drawings
Fig. 1 is 800MPa grades of hot-rolled dual-phase steel steel band typical case's metallographic structure figures of 2~4mm thickness in the present invention.
Specific implementation mode
It elaborates to technical solution of the present invention below with reference to example embodiment.However, example embodiment can Implement in a variety of forms, and is not understood as limited to embodiment set forth herein;On the contrary, thesing embodiments are provided so that The design of example embodiment more comprehensively and completely, and is comprehensively communicated to those skilled in the art by the present invention.
The processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness, specifically includes following steps:
Step 1:Smelting and continuous casting;
Molten iron pre-processes, converter, LF refining, casting machine continuous casting.
Step 2:Slab is packed into reheating stove heat, is strict controlled in stove time, 1260 ± 20 DEG C of tapping temperature;
Step 3:Rolling includes roughing and finish rolling;Start rolling temperature >=950 DEG C of finish rolling, the finishing temperature of finish rolling is 830~ 860℃;
Roughing uses 2 machine frame rolling mill roughing, finish rolling to use 7 rack continuously variable crown (Continuously variable Crown, cvc) milling train finish rolling.
Step 4:Strip cools down;Cooling to use section cooling equipment, sub-sectional cooling pattern, first segment cooling velocity is 35 DEG C/s, medium temperature is 630~650 DEG C, and air cooling time is 5~6s, and the temperature batched is 100~180 DEG C.
800MPa grades of hot-rolled dual-phase steels of finished product 2~4mm thickness, the mass percentage of the chemical composition of material include:C: 0.065-0.085%, Si:0.45-0.55%, Mn:1.45-1.60%, P:≤ 0.020%, S≤0.010%, Cr:0.35- 0.45%, Nb:0.035~0.045%, surplus is Fe and impurity.
As shown in Figure 1, being 800MPa grades of hot-rolled dual-phase steel steel band typical case's metallographic structure figures of 2~4mm thickness in the present invention.Metallographic It is organized as ferrite+martensite.
Embodiment 1
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting Whole Argon is smelted, converter, 1650 DEG C of Tapping Temperature of Bof is added in steel scrap.Then molten steel after converter smelting is subjected to essence outside LF stoves Refining, refines temperature >=1560 DEG C in place, is smelted by chemical composition shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.Later into andante Base cleaning, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1240 DEG C, and the time of heating is 220min, after heating Slab carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling open rolling temperature 1020 DEG C of degree, finish rolling finishing temperature are 830 DEG C.Section cooling uses two-stage cooling, 35 DEG C/s of first segment cooling velocity, steel band 630 DEG C, then air-cooled, time 5s, about 100 DEG C/s of second segment cooling velocity are reduced to by first segment cooling, temperature of steel strips 120 DEG C are reduced to batch.Finally carry out quality examination, qualified dual phase steel steel band to obtain the final product.
Embodiment 2
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting Whole Argon is smelted, converter, 1650 DEG C of Tapping Temperature of Bof is added in steel scrap.Then molten steel after converter smelting is subjected to essence outside LF stoves Refining, refines temperature >=1560 DEG C in place.It is smelted by chemical composition shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.Later into andante Base cleaning, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1260 DEG C, and the time of heating is 220min, after heating Slab carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling open rolling temperature 1030 DEG C of degree, finish rolling finishing temperature are 840 DEG C.Section cooling uses two-stage cooling, 35 DEG C/s of first segment cooling velocity, steel band 640 DEG C, then air-cooled, time 6s, about 100 DEG C/s of second segment cooling velocity are reduced to by first segment cooling, temperature of steel strips 150 DEG C are reduced to batch.Finally carry out quality examination, qualified dual phase steel steel band to obtain the final product.
Embodiment 3
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting Whole Argon is smelted, converter, 1650 DEG C of Tapping Temperature of Bof is added in steel scrap.Then molten steel after converter smelting is subjected to essence outside LF stoves Refining, refines temperature >=1560 DEG C in place, is smelted by chemical composition shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.Later into andante Base cleaning, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1280 DEG C, and the time of heating is 240min, after heating Slab carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling open rolling temperature 1030 DEG C of degree, finish rolling finishing temperature are 840 DEG C.Section cooling uses two-stage cooling, 35 DEG C/s of first segment cooling velocity, steel band 650 DEG C, then air-cooled, time 6s, about 100 DEG C/s of second segment cooling velocity are reduced to by first segment cooling, temperature of steel strips 180 DEG C are reduced to batch.Finally carry out quality examination, qualified dual phase steel steel band to obtain the final product.
The chemical composition (wt%) of 1 embodiment of the present invention 1~3 of table
Embodiment C Si Mn P S Cr Nb
1 0.065 0.45 1.45 0.013 0.004 0.35 0.035
2 0.075 0.40 1.50 0.014 0.005 0.40 0.040
3 0.085 0.55 1.60 0.010 0.003 0.45 0.045
Mechanical properties test is carried out to the steel plate of the embodiment of the present invention 1~3, inspection result is shown in Table 2.
The mechanical property of the steel plate of 2 embodiment of the present invention 1~3 of table
Term used herein is explanation and term exemplary, and not restrictive.Since the present invention can be with a variety of Form be embodied without departing from invention spirit or essence, it should therefore be appreciated that above-described embodiment be not limited to it is any above-mentioned Details, and should widely being explained in the spirit and scope defined by appended claims, thus fall into claim or its etc. Whole variations and remodeling in effect range all should be appended claims and covered.

Claims (4)

1. a kind of processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness, including:
Smelting, continuous casting and reheating process;During reheating, slab is packed into reheating stove heat, controls time inside furnace, goes out furnace temperature 1260 ± 20 DEG C of degree;
Roughing and finish rolling;Roughing uses 2 machine frame rolling mill roughing, finish rolling that 7 rack continuously variable crown milling train finish rolling, finish rolling is used to open Temperature >=950 DEG C are rolled, the finishing temperature of finish rolling is 830~860 DEG C;
Strip is cooling and batches;Cooling to use section cooling equipment, sub-sectional cooling pattern, first segment cooling velocity is 35 DEG C/s, 100 DEG C/s of second segment cooling velocity, medium temperature be 630~650 DEG C, air cooling time be 5~6s, the temperature batched be 100~ 180℃;The mass percentage of chemical composition includes:C:0.065-0.085%, Si:0.45-0.55%, Mn:1.45- 1.60%, P:≤ 0.020%, S≤0.010%, Cr:0.35-0.45%, Nb:0.035~0.045%, surplus is Fe and miscellaneous Matter.
2. the processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness as described in claim 1, it is characterised in that:By molten iron into Row desulfurization pretreatment makes molten steel decarburization, dephosphorization obtain molten steel using top and bottom combined blown converter smelting, and converter smelting whole process Argon turns 1650 DEG C of stove tapping temperature;Then molten steel after converter smelting is subjected to LF external refinings, refines temperature >=1560 DEG C in place, slab 25 DEG C of the continuous casting degree of superheat;Slab cleaning, slow cooling and continuous casting are carried out later;Slab heating temperature is 1240 DEG C, and the time of heating is Slab after heating is carried out high pressure water dephosphorization by 220min, and fixed-width pressure machine fixed width, using 2 rack roughing, 7 racks continuously become Convex rolling mill finish rolling, 1020 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature are 830 DEG C;Section cooling uses two-stage cooling, the 35 DEG C/s of one-step cooling speed, steel band are reduced to 630 DEG C, then air-cooled, time 5s by first segment cooling, second segment cooling 100 DEG C/s of speed, temperature of steel strips are reduced to 120 DEG C and batch.
3. the processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness as described in claim 1, it is characterised in that:By molten iron into Row desulfurization pretreatment makes molten steel decarburization, dephosphorization obtain molten steel using top and bottom combined blown converter smelting, and converter smelting whole process Argon turns 1650 DEG C of stove tapping temperature;Then molten steel after converter smelting is subjected to LF external refinings, refines temperature >=1560 DEG C in place, slab 25 DEG C of the continuous casting degree of superheat;Slab cleaning, slow cooling and continuous casting are carried out later;Slab heating temperature is 1260 DEG C, and the time of heating is Slab after heating is carried out high pressure water dephosphorization by 220min, and fixed-width pressure machine fixed width, using 2 rack roughing, 7 racks continuously become Convex rolling mill finish rolling, 1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature are 840 DEG C;Section cooling uses two-stage cooling, the 35 DEG C/s of one-step cooling speed, steel band are reduced to 640 DEG C, then air-cooled, time 6s by first segment cooling, second segment cooling 100 DEG C/s of speed, temperature of steel strips are reduced to 150 DEG C and batch.
4. the processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness as described in claim 1, it is characterised in that:By molten iron into Row desulfurization pretreatment makes molten steel decarburization, dephosphorization obtain molten steel using top and bottom combined blown converter smelting, and converter smelting whole process Argon is given up Converter, 1650 DEG C of Tapping Temperature of Bof is added in steel;Then molten steel after converter smelting is subjected to LF external refinings, refines temperature in place >=1560 DEG C, 25 DEG C of the sheet billet continuous casting degree of superheat;Slab cleaning, slow cooling and continuous casting are carried out later;Slab heating temperature is 1280 DEG C, The time of heating is 240min, and the slab after heating is carried out high pressure water dephosphorization, fixed-width pressure machine fixed width;Using 2 rack roughing, 7 rack continuously variable crown milling train finish rolling, 1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature are 840 DEG C;Section cooling uses two Segmentation cools down, 35 DEG C/s of first segment cooling velocity, and steel band is reduced to 650 DEG C by first segment cooling, and then air-cooled, the time is 6s, 100 DEG C/s of second segment cooling velocity, temperature of steel strips are reduced to 180 DEG C and batch.
CN201611113787.8A 2016-12-06 2016-12-06 The processing method of 800MPa grades of hot-rolled dual-phase steels of 2~4mm thickness Withdrawn - After Issue CN106834915B (en)

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CN107829027B (en) * 2017-10-19 2020-01-31 武汉钢铁有限公司 thin 780 MPa-grade dual-phase steel and processing method thereof
CN107829026B (en) * 2017-10-19 2020-01-31 武汉钢铁有限公司 thin-specification 980 MPa-grade dual-phase steel and processing method thereof
CN108568503B (en) * 2018-04-27 2020-11-03 唐山钢铁集团有限责任公司 Method for accurately controlling carbon content of molten steel in 600MPa dual-phase steel tundish
CN109161797B (en) * 2018-09-06 2020-11-03 邯郸钢铁集团有限责任公司 Lightweight fatigue-resistant hot-rolled dual-phase wheel steel and production method thereof
CN109536845B (en) * 2019-02-01 2021-09-21 本钢板材股份有限公司 Hot-rolled ferrite-bainite dual-phase steel strip with tensile strength of 590MPa for wheel and preparation method thereof

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