CN104593677A - Production process of heavy gauge hot-rolled dual-phase steel DP600 - Google Patents

Production process of heavy gauge hot-rolled dual-phase steel DP600 Download PDF

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Publication number
CN104593677A
CN104593677A CN201510023947.9A CN201510023947A CN104593677A CN 104593677 A CN104593677 A CN 104593677A CN 201510023947 A CN201510023947 A CN 201510023947A CN 104593677 A CN104593677 A CN 104593677A
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steel
rolling
cooling
hot
temperature
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CN104593677B (en
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王健
房锦超
于世川
曹建利
张玉文
杨杰
乔治明
师可新
田秀刚
张春花
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Tangshan Iron and Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a production process of heavy gauge hot-rolled dual-phase steel DP600. The production process comprises a steelmaking step, a hot rolling step and a cooling step, wherein liquid steel in the steelmaking step contains the following chemical components in percentage by weight: 0.06%-0.10% of C, 0.80%-0.95% of Mn, less than or equal to 0.008% of S, 0.030%-0.050% of P, 0.1%-0.2% of Si, 0.020%-0.060% of Als, 0.65%-0.80% of Cr, less than or equal to 0.0050% of N and the balance of iron and inevitable impurities; the hot rolling step comprises a heating step, a rolling step and a cooling step; in the rolling step, the rough rolling starting temperature ranges from 1080 to 1130 DEG C, the finish rolling starting temperature is within the range of 1040+/-20 DEG C, and the final rolling temperature is within the range of 845+/-20 DEG C; in the cooling step, laminar flow cooling is in a sub-sectional cooling mode to guarantee that the curling temperature is less than or equal to 270 DEG C. According to the production process, less alloy addition quantity is adopted and the principle of phase strengthening is mainly adopted, and consequently, the production control difficulty is low, the content of occluded foreign substances is extremely low, the light weight development requirement of automobiles is met and tremendous economic benefit can be generated.

Description

The production technique of think gauge hot-rolled dual-phase steel DP600
Technical field
The present invention relates to a kind of production technique of dual phase steel, the production technique of especially a kind of think gauge hot-rolled dual-phase steel DP600.
Background technology
Ferrite/martensite dual phase steel is a kind of type material that 20 century 70s grow up mid-term, main based on phase transformation strengthening, have the features such as low yield strength ratio, high initial manufacture hardening rate, good strength and ductility cooperation, it is mainly used in the structural part of the side bar of automobile, side suspension member, crossbeam, pillar, chassis stiffener, tank support and car body, stiffener and anti-striker.In young mobile partner program, in ultralight car body steel, dual phase steel consumption is maximum, accounts for 70%, and therefore the production of dual phase steel is significant to automotive light weight technology.
Along with the raising of China's expanding economy and national income, by 2011, auto output has reached 1,000 ten thousand, automobile industry's steel demand reaches 1520 ~ 1,840 ten thousand tons, if will account for the criterion calculation of automobile steel 45% by North America dual phase steel consumption in 2010, China's automobile dual phase steel usage quantity will reach 700 ~ 8,200,000 tons.As can be seen here, High Property DP Steel is with a wide range of applications in China.Consider the hardening capacity in dual phase steel process of cooling, the specification of domestic main flow dual phase steel is all less than 5mm, therefore, need develop the think gauge dual phase steel of thickness 5 ~ 6.5mm to meet the demand of automobile steel.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production technique of a kind of high performance think gauge hot-rolled dual-phase steel DP600, adopt less alloy addition, the principle that main application is strengthened mutually, production control difficulty is little, inclusion content is extremely low, meet the development need of automotive light weight technology, great economic benefit can be produced.
For solving the problems of the technologies described above, the present invention includes steel-making step, hot-rolled step and cooling step, it is characterized in that, the weight percent of described steel-making step ladle chemistry is: C 0.06% ~ 0.10%, Mn 0.80% ~ 0.95%, S≤0.008%, P 0.030% ~ 0.050%, Si 0.1% ~ 0.2%, Als 0.020% ~ 0.060%, Cr 0.65% ~ 0.80%, N≤0.0050%, all the other are iron and inevitable impurity;
Hot-rolled step comprises heating process, rolling process and refrigerating work procedure;
Described rolling process: roughing start rolling temperature 1080 ~ 1130 DEG C, finish rolling start rolling temperature 1040 DEG C ± 20 DEG C, finishing temperature 845 ± 20 DEG C;
Described refrigerating work procedure: section cooling adopts sub-sectional cooling pattern, ensures coiling temperature≤270 DEG C.
Section cooling of the present invention adopts two sections of process for cooling: (1) band steel enters after finishing train rolling
First group of cold front temperature of layer is 827 ± 15 DEG C, is then quickly cooled to 700 ~ 715 DEG C with the speed of 20 ~ 40 DEG C/s, at this temperature range air cooling 1.7 ~ 2.5s;
(2) be chilled to by force 365 DEG C ± 20 DEG C with steel with the speed of 20 ~ 40 DEG C/s after first paragraph air cooling, then be cooled to 270 DEG C and to batch below with the speed of 10 DEG C/s.
Gauge thickness of the present invention is 5 ~ 6.5mm.
The weight percent that the present invention optimizes steel water chemical composition is: C 0.08%, Mn 0.90%, S≤0.005%, P 0.04%, Si 0.15%, Als 0.035%, Cr 0.73%, N≤0.0040%, and all the other are iron and inevitable impurity.
Adopt the beneficial effect that produces of technique scheme to be: the present invention by molten iron after converter and LF stove are smelted, carry out continuous casting, then controlled rolling and controlled cooling is carried out to strand, utilize the principle of phase transformation strengthening, produce the ferrite/martensite think gauge hot-rolled dual-phase steel DP600 that ratio of martensite is about 15%; Product tensile strength tensile strength Rm > 590MPa, unit elongation A 80> 19%, yield tensile ratio is 0.5 ~ 0.7, baking hardening value > 50MPa; Meet the demand of automobile steel, with low cost, expand the Application Areas of dual phase steel.The present invention adopts less alloy addition, the principle that main application is strengthened mutually, and production control difficulty is little, and inclusion content is extremely low, meets the development need of automotive light weight technology, can produce great economic benefit.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the 200X metallographic structure figure of product of the present invention.
Embodiment
The production technique of this think gauge hot-rolled dual-phase steel DP600, comprises steel-making step, hot-rolled step and cooling step.
(1) operation of steel-making step is: blast-melted-top and bottom combined blown converter-LF refining; Adopt the smelting technology of Clean Steel, the weight percent going out steel chemical composition is: C 0.06% ~ 0.10%, Mn 0.80% ~ 0.95%, S≤0.008%, P 0.030% ~ 0.050%, Si 0.1% ~ 0.2%, Als 0.020% ~ 0.060%, Cr 0.65% ~ 0.80%, N≤0.0050%, all the other are iron and inevitable impurity.
(2) hot-rolled step comprises continuous casting working procedure, heating process, rolling process and refrigerating work procedure; Application controls rolling, sub-sectional cooling explained hereafter, technological process is:
A, heating process: slab heating temperature is 1180 ~ 1230 DEG C.
B, rolling process: roughing start rolling temperature 1080 ~ 1130 DEG C, enter Coil Box and batch after five passage roughing, through seven frame hot continuous rollings after de-scaling, and adopts lubrication and rolling, finish rolling start rolling temperature 1040 DEG C ± 20 DEG C, finishing temperature 845 ± 20 DEG C.
C, refrigerating work procedure: adopt two sections of process for cooling: 1) being with steel, after finishing train rolling, enter first group of cold front temperature of layer be 827 ± 15 DEG C, after be quickly cooled to 700 ~ 715 DEG C with the speed of 20 ~ 40 DEG C/s, at this temperature range air cooling about 1.7 ~ 2.5s; 2) be chilled to by force 365 DEG C ± about 20 DEG C with steel with the speed of 20 ~ 40 DEG C/s after first paragraph air cooling, then be cooled to less than 270 DEG C with the speed of 10 DEG C/s and carry out batching and obtain ferrite and martensitic mixed structure; Fig. 1 is the typical gold phase constitution of present method gained think gauge hot-rolled dual-phase steel DP600, through LEPERA reagent (1at% Na 2s 2o 5+ 4at% picral) dyeing, wherein white portion is martensite, and grey parts is ferrite.
Embodiment 1: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent of tapping molten iron chemical composition is: C 0.08%, Mn 0.89%, S 0.002%, P 0.04%, Si 0.17%, Als 0.038%, Cr 0.73%, N 0.0040%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1090-1110 DEG C; Finish rolling start rolling temperature 1030 ± 10 DEG C, finishing temperature is 847 ± 10 DEG C, and rolled sheet material thickness is 6.3mm; Before entering section cooling, temperature is 820 ~ 827 DEG C, is cooled to 705-715 DEG C, air cooling 2.1s with 30 DEG C/s; Continue to be cooled to 355 ~ 365 DEG C with 30 DEG C/s speed, then be cooled to 230 ± 10 DEG C with the speed of 10 DEG C/s and batch.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 660MPa, yield strength 393MPa, unit elongation 22%, yield tensile ratio 0.59, baking hardening value 70MPa;
Longitudinally: tensile strength 599MPa, yield strength 331MPa, unit elongation 24%, yield tensile ratio 0.55, baking hardening value 65MPa.
Embodiment 2: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent going out ladle chemistry is: C 0.07%, Mn 0.87%, S 0.004%, P 0.043%, Si 0.14%, Als 0.040%, Cr 0.70%, N 0.0034%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1090-1110 DEG C; Finish rolling start rolling temperature 1050 ± 10 DEG C, finishing temperature is 840 DEG C ± 10 DEG C, and rolled sheet material thickness is 6.3mm; Before entering section cooling, temperature is 827 ± 5 DEG C, is cooled to 700-710 DEG C, air cooling 2.2s with 25 DEG C/s; Continue to be cooled to 380 ~ 385 DEG C with 25 DEG C/s speed, then be cooled to 220 ± 10 DEG C with the speed of 10 DEG C/s and batch.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 645MPa, yield strength 373MPa, unit elongation 24%, yield tensile ratio 0.58, baking hardening value 68MPa;
Longitudinally: tensile strength 594MPa, yield strength 340MPa, unit elongation 26%, yield tensile ratio 0.57, baking hardening value 72 MPa.
Embodiment 3: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent going out ladle chemistry is: C 0.10%, Mn 0.80%, S 0.004%, P 0.043%, Si 0.17%, Als 0.040%, Cr 0.75%, N 0.0034%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1080-1110 DEG C; Finish rolling start rolling temperature 1045 ± 10 DEG C, finishing temperature is 855 DEG C ± 10 DEG C, and rolled sheet material thickness is 6.3mm; Before entering section cooling, temperature is 830 ± 5 DEG C, is cooled to 700-710 DEG C with the speed of 40 DEG C/s, air cooling 2.5s; Continue to be cooled to 375 ~ 385 DEG C with 35 DEG C/s speed, then be cooled to 220 ± 10 DEG C with the speed of 10 DEG C/s and batch.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 610MPa, yield strength 363MPa, unit elongation 25/%, yield tensile ratio 0.59, baking hardening value 71MPa;
Longitudinally: tensile strength 591MPa, yield strength 342MPa, unit elongation 26/%, yield tensile ratio 0.57, baking hardening value 65 MPa.
Embodiment 4: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent going out ladle chemistry is: C 0.08%, Mn 0.90%, S 0.002%, P 0.04%, Si 0.17%, Als 0.038%, Cr 0.73%, N 0.0040%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1100-1120 DEG C; Finish rolling start rolling temperature 1040 ± 10 DEG C, finishing temperature is 845 ± 10 DEG C, and rolled sheet material thickness is 5.8mm; Before entering section cooling, temperature is 825-835 DEG C, is cooled to 705 ~ 710 DEG C with 30 DEG C/s, and air cooling is about 2s; Continue to be cooled to 365 ± 5 DEG C with 30 DEG C/s speed, then be cooled to 240 DEG C ± 10 DEG C with the speed of 10 DEG C/s and batch.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 666MPa, yield strength 400MPa, unit elongation 21%, yield tensile ratio 0.60, baking hardening value 72MPa;
Longitudinally: tensile strength 620MPa, yield strength 351MPa, unit elongation 22%, yield tensile ratio 0.56, baking hardening value 66MPa.
Embodiment 5: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent of tapping molten iron chemical composition is: C 0.06%, Mn 0.92%, S 0.005%, P 0.03%, Si 0.20%, Als 0.020%, Cr 0.80%, N 0.0045%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1110-1130 DEG C; Finish rolling start rolling temperature 1035 ± 10 DEG C, finishing temperature is 840 ± 10 DEG C, and rolled sheet material thickness is 6.5mm; Before entering section cooling, temperature is 812 ~ 825 DEG C, is cooled to 700 ~ 710 DEG C with 25 DEG C/s, and air cooling is about 2.5s; Continue to be cooled to 350 ± 5 DEG C with 40 DEG C/s speed, then be cooled to 270 DEG C with the speed of 10 DEG C/s and batch.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 620MPa, yield strength 377MPa, unit elongation 24%, yield tensile ratio 0.60, baking hardening value 68MPa;
Longitudinally: tensile strength 600MPa, yield strength 351MPa, unit elongation 25%, yield tensile ratio 0.58, baking hardening value 65MPa.
Embodiment 6: the concrete technology of the production technique of this think gauge hot-rolled dual-phase steel DP600 is as described below.
Steel-making step: the weight percent of tapping molten iron chemical composition is: C 0.09%, Mn 0.95%, S 0.008%, P 0.050%, Si 0.10%, Als 0.060%, Cr 0.65%, N 0.0050%, all the other are iron and inevitable impurity.
Hot-rolled step: the start rolling temperature of slab rough rolling is controlled at 1100 ~ 1110 DEG C; Finish rolling start rolling temperature 1030 ± 10 DEG C, finishing temperature is 835 ± 10 DEG C, and rolled sheet material thickness is 5.0mm; Before entering section cooling, temperature is cooled to 365 ± 5 DEG C for [rainforest wood wind 1] DEG C/s speed, then is cooled to 260 DEG C with the speed of 10 DEG C/s and batches.
After tested, actual performance is as follows for the mechanical property of the present embodiment gained DP600 dual phase steel:
Laterally: tensile strength 651MPa, yield strength 393MPa, unit elongation 22%, yield tensile ratio 0.60, baking hardening value 70MPa;
Longitudinally: tensile strength 621MPa, yield strength 371MPa, unit elongation 24%, yield tensile ratio 0.59, baking hardening value 65MPa.
From embodiment 1-6, product tensile strength tensile strength Rm > 590MPa, unit elongation A of the present invention 80> 19%, yield tensile ratio is 0.5 ~ 0.7, and baking hardening value > 50Mpa, meets the demand of automobile steel.

Claims (4)

1. the production technique of a think gauge hot-rolled dual-phase steel DP600, it comprises steel-making step, hot-rolled step and cooling step, and it is characterized in that, the weight percent that described steel-making step goes out ladle chemistry is: C 0.06% ~ 0.10%, Mn 0.80% ~ 0.95%, S≤0.008%, P 0.030% ~ 0.050%, Si 0.1% ~ 0.2%, Als 0.020% ~ 0.060%, Cr 0.65% ~ 0.80%, N≤0.0050%, all the other are iron and inevitable impurity;
Hot-rolled step comprises heating process, rolling process and refrigerating work procedure;
Described rolling process: roughing start rolling temperature 1080 ~ 1130 DEG C; Finish rolling start rolling temperature 1040 DEG C ± 20 DEG C, finishing temperature 845 ± 20 DEG C;
Described refrigerating work procedure: section cooling adopts sub-sectional cooling pattern, ensures coiling temperature≤270 DEG C.
2. the production technique of think gauge hot-rolled dual-phase steel DP600 according to claim 1, it is characterized in that, described section cooling adopts two sections of process for cooling: it is 827 ± 15 DEG C that (1) band steel enters first group of cold front temperature of layer after finishing train rolling, then 700 ~ 715 DEG C are quickly cooled to the speed of 20 ~ 40 DEG C/s, at this temperature range air cooling 1.7 ~ 2.5s;
(2) be chilled to by force 365 DEG C ± 20 DEG C with steel with the speed of 20 ~ 40 DEG C/s after first paragraph air cooling, then be cooled to 270 DEG C and to batch below with the speed of 10 DEG C/s.
3. the production technique of think gauge hot-rolled dual-phase steel DP600 according to claim 1, is characterized in that: described gauge thickness is 5 ~ 6.5mm.
4. the production technique of the think gauge hot-rolled dual-phase steel DP600 according to claim 1,2 or 3, it is characterized in that, the weight percent of described ladle chemistry is: C 0.08%, Mn 0.90%, S≤0.005%, P 0.04%, Si 0.15%, Als 0.035%, Cr 0.73%, N≤0.0040%, all the other are iron and inevitable impurity.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107983771A (en) * 2017-11-23 2018-05-04 攀钢集团攀枝花钢铁研究院有限公司 The high-strength chill volume hot-rolling method of building concrete fixing piece

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Publication number Priority date Publication date Assignee Title
CN101717886A (en) * 2009-11-20 2010-06-02 江苏省沙钢钢铁研究院有限公司 Hot-rolled dual-phase steel plate with 650 MPa-level tensile strength and manufacturing method thereof
CN101781739A (en) * 2010-03-18 2010-07-21 武汉钢铁(集团)公司 Automobile cold-rolled dual-phase steel with tensile strength of 500 MPa
CN102912235A (en) * 2012-10-29 2013-02-06 武汉钢铁(集团)公司 Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel
CN103510008A (en) * 2013-09-18 2014-01-15 济钢集团有限公司 Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN101717886A (en) * 2009-11-20 2010-06-02 江苏省沙钢钢铁研究院有限公司 Hot-rolled dual-phase steel plate with 650 MPa-level tensile strength and manufacturing method thereof
CN101781739A (en) * 2010-03-18 2010-07-21 武汉钢铁(集团)公司 Automobile cold-rolled dual-phase steel with tensile strength of 500 MPa
CN102912235A (en) * 2012-10-29 2013-02-06 武汉钢铁(集团)公司 Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel
CN103510008A (en) * 2013-09-18 2014-01-15 济钢集团有限公司 Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107983771A (en) * 2017-11-23 2018-05-04 攀钢集团攀枝花钢铁研究院有限公司 The high-strength chill volume hot-rolling method of building concrete fixing piece

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