600 Mpa grade hot-rolling dual-phase steel and preparation method thereof

A technology for hot-rolling dual-phase steel and steel plate, applied in the field of metallurgy, can solve the problems of uneven performance of head and tail, rising cost, etc., and achieve the effect of thin product specification, reduction of raw material cost, and uniform longitudinal performance.

Inactive Publication Date: 2012-10-03
NORTHEASTERN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase in cost caused by the addition of alloying element Mo, the cancellation of Mo addition has become the main trend
Single billet rolling usually brings the problem of uneven performance at the head and tail, which has also become one of the problems that steel mills need to solve urgently

Method used

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  • 600 Mpa grade hot-rolling dual-phase steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Heating the continuous casting slab with a thickness of 60mm, controlling the heating temperature to 1150°C, the soaking time to 120min, and the furnace temperature to 1100°C. The components of the continuous casting slab are: C: 0.05%, Si: 0.1%, Mn: 1.10%, Cr: 0.5%, the balance is Fe and unavoidable impurities;

[0022] (2) Roll the continuous casting slab, control the furnace temperature of 1100°C, the finish rolling bite temperature of 970°C, the final rolling temperature of 800°C, and the rolling speed of 4m / s;

[0023] (3) Cooling control after hot rolling, firstly through ultra-rapid cooling, the temperature drop is 100°C, the cooling rate is 100°C / S, then air cooling for 2s, and then laminar cooling to 250°C, the cooling rate is 85°C / S;

[0024] (4) All secondary rolling with constant speed and constant thickness is adopted, the thickness range of the steel plate is 2.5mm, the length of the steel plate is 1.5mm, and the rolling speed is 4m / s;

[0025] (5) Co...

Embodiment 2

[0029] (1) Heat the continuous casting slab with a thickness of 70mm, control the heating temperature at 1200°C, soak time for 120min, and the furnace temperature at 1150°C. The components of the continuous casting slab are: C: 0.07%, Si: 0.4%, Mn: 1.50%, Cr: 0.7%, the balance is Fe and unavoidable impurities;

[0030] (2) Roll the continuous casting slab, control the furnace temperature of 1150°C, the finish rolling bite temperature of 980°C, the final rolling temperature of 840°C, and the rolling speed of 5m / s;

[0031] (3) Cooling control after hot rolling, firstly through ultra-rapid cooling, the temperature drop is 130°C, the cooling rate is 140°C / S, then air cooling for 5s, and then laminar cooling to 240°C, the cooling rate is 115°C / S;

[0032] (4) All secondary rolling with constant speed and constant thickness is adopted, the thickness range of the steel plate is 4.5mm, the length of the steel plate is 1.5mm, and the rolling speed is 5m / s;

[0033] (5) Coiling is car...

Embodiment 3

[0036] (1) Heat a continuous casting slab with a thickness of 65mm, control the heating temperature at 1170°C, soak for 120 minutes, and release the furnace at a temperature of 1120°C. The components of the continuous casting slab are: C: 0.06%, Si: 0.2%, Mn: 1.20%, Cr: 0.6%, the balance is Fe and unavoidable impurities;

[0037] (2) Roll the continuous casting slab, control the furnace temperature of 1120°C, the finish rolling bite temperature of 970°C, the final rolling temperature of 830°C, and the rolling speed of 4.5m / s;

[0038] (3) Cooling control after hot rolling, firstly through ultra-rapid cooling, the temperature drop is 120°C, the cooling rate is 110°C / S, then air cooling for 3s, and then laminar cooling to 245°C, the cooling rate is 100°C / S;

[0039] (4) All secondary rolling with constant speed and constant thickness is adopted, the thickness range of the steel plate is 3.0mm, the length of the steel plate is 1.5mm, and the rolling speed is 4.5m / s;

[0040] (5)...

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Abstract

The invention relates to the technical field of metallurgy, in particular to 600 Mpa grade hot-rolling dual-phase steel and a preparation method thereof. The 600 Mpa grade hot-rolling dual-phase steel is characterized in that a steel plate comprises the following chemical compositions in mass percent: 0.05-0.07% of C, 0.1-0.4% of Si, 1.10-1.50% of Mn, 0.5-0.7% of Cr and the rest of Fe; the structure of the 600 Mpa grade hot-rolling dual-phase steel is soft-phase ferrite and hard-phase martensite, the volume percentage of the ferrite is 70-90%, the volume percentage of the martensite is 10-30%, and the 600 Mpa grade hot-rolling dual-phase steel has the yield strength Rp0.2 of 355-375Mpa, the tensile strength Rm of 590-650Mpa, the yield ratio of 0.56-0.60 and the percentage of total elongation after fracture of 24-30%. On the basis of C-Mn-Cr system chemical compositions, the 600 Mpa grade hot-rolling dual-phase steel is produced on a continuous casting and rolling production line for sheet billets by adopting a three-stage type cooling technology by applying a semi endless rolling technology.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a 600MPa grade hot-rolled dual-phase steel and a preparation method thereof. Background technique [0002] Since the advent of dual-phase steel in the 1960s, it has played an important role in automobile weight reduction. Due to its low cost and good performance, hot-rolled dual-phase steel has been applied in 75-80% of automobile body-in-white. In the world, microalloying elements such as Cr, Mo or Nb, Ti are mainly added, and single billet rolling is used to produce hot-rolled dual-phase steel. Since the addition of the alloying element Mo leads to an increase in cost, canceling the addition of Mo has become a major trend. Single billet rolling usually brings the problem of uneven performance at the head and tail, which has become one of the problems that steel mills need to solve urgently. [0003] The semi-endless rolling technology of LY Steel is mainly applicable to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D8/02
Inventor 刘振宇李会蔡晓辉杨峰周晓光廖志王国栋周明伟成小军刘旭辉
Owner NORTHEASTERN UNIV
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