A production method of cold-rolled dual-phase steel substrate

A production method and technology of dual-phase steel, applied in metal rolling and other directions, can solve the problems of fluctuation in mechanical properties of the whole coil, difficulty in cold rolling and annealing, fluctuation in pass-length properties, etc. economic effect

Active Publication Date: 2018-01-16
TANGSHAN IRON & STEEL GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high alloy content of cold-rolled dual-phase steel, especially products of 780MPa and above, the mechanical properties of the entire coil may fluctuate during the hot-rolling process (fluctuation in overall performance), which will bring great impact to downstream cold-rolling and annealing. Difficulties

Method used

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  • A production method of cold-rolled dual-phase steel substrate

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Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The specific process of the production method of the cold-rolled dual-phase steel substrate is as follows.

[0020] Steelmaking and casting steps: The weight percentage of the chemical composition of the molten steel is: C 0.15%, Mn 1.50%, S0.012%, P 0.025%, Si 0.25%, Cr 0.40%, Ti 0.015%, N 0.005%, and the rest For iron and unavoidable impurities, in the casting step, the superheating degree of molten steel is 30°C; with the application of dynamic light pressure, the fluctuation of the crystallizer liquid level is stably controlled within ±2mm.

[0021] Heating steps: first heating section temperature: 900-1000°C, second heating section temperature: 1100-1200°C, third heating section temperature: 1250-1300°C, soaking section temperature: 1230-1280°C, slab head-to-tail temperature difference ≤20 ℃.

[0022] Hot rolling step: control the start rolling temperature of the rough rolling of the slab at 1110±10°C; the start rolling temperature of the finish roll...

Embodiment 2

[0024] Embodiment 2: The specific process of the production method of the cold-rolled dual-phase steel substrate is as follows.

[0025] Steelmaking and casting steps: The weight percentage of the chemical composition of the molten steel is: C 0.19%, Mn 1.90%, S0.010%, P 0.012%, Si 0.5%, Cr 1.0%, Ti 0.055%, Nb 0.050%, N 0.005%, the rest is iron and unavoidable impurities. During the casting process, the superheated degree of molten steel is 25°C; under dynamic light pressure, the fluctuation of the mold liquid level is stably controlled within ±2mm.

[0026] Heating steps: temperature of the first heating section: 850-950°C, temperature of the second heating section: 1150-1220°C, temperature of the third heating section: 1280-1320°C, temperature of the soaking section: 1250-1300°C, temperature difference between the head and tail of the slab ≤20 ℃.

[0027] Hot rolling step: control the start rolling temperature of the rough rolling of the slab at 1120±10°C; the start rolling...

Embodiment 3

[0029] Embodiment 3: The specific process of the production method of the cold-rolled dual-phase steel substrate is as follows.

[0030] Steelmaking and casting steps: The weight percentage of the chemical composition of the molten steel is: C 0.17%, Mn 1.80%, S0.008%, P 0.010%, Si 0.3%, Cr 0.60%, Nb 0.035%, Ti 0.025%, N 0.007%, the rest is iron and unavoidable impurities. During the casting process, the superheated degree of molten steel is 35°C; under dynamic light pressure, the crystallizer liquid level fluctuation is stably controlled within ±2mm.

[0031] Heating steps: first heating section temperature: 850-950°C, second heating section temperature: 1120-1230°C, third heating section temperature: 1280-1320°C, soaking section temperature: 1240-1290°C, slab head-to-tail temperature difference ≤20 ℃.

[0032] Hot rolling step: control the start rolling temperature of the rough rolling of the slab at 1130±10°C; the start rolling temperature of the finish rolling is 1070±10°...

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Abstract

The invention discloses a production method for a cold rolling dual-phase steel base plate. The production method includes the steel-making and casting step, the heating step, the hot rolling step and the cooling step. The cooling step is in a three-section cooling manner, wherein strip steel is firstly subject to first-time forced cooling and is cooled to 700 DEG C to 740 DEG C; then air cooling is carried out for 1.5 s to 3 s within the temperature range; and the strip steel obtained after air cooling is subject to second-time forced cooling to 620 DEG C to 690 DEG C for reeling, U-shaped control is adopted for reeling, in other words, the temperature used when 20 m to 30 m of the strip steel from the head is reeled is 10 DEG C to 30 DEG C higher than the temperature used when the middle portion of the strip steel is reeled, and the temperature used when 40 m to 80 m of the strip steel to the tail is reeled is 20 DEG C to 40 DEG C higher than the temperature used when the middle portion of the strip steel is reeled. According to the method, at the temperature close to the austenite transformation Curie temperature, the slow cooling process is adopted, ferritic structures are homogenized, and the precipitation proportion of pearlites is controlled; compared with a conventional production process, the uniformity of the structures and the performance is facilitated; and through mechanics property analysis in the hot rolling pass length direction, the strength property fluctuation is smaller than 20 MPa, and the products meet the using requirements of a next working procedure.

Description

technical field [0001] The invention relates to a production method of hot-rolled steel strip, in particular to a production method of cold-rolled dual-phase steel substrate. Background technique [0002] Cold-rolled dual-phase steel has many advantages such as low yield strength, high tensile strength, strong work hardening ability, large total elongation and uniform elongation, easy stamping, good plasticity and toughness matching, etc. Quantified material has become a typical representative of the new generation of high-strength steel for automobiles. Dual-phase steel not only has high strength but also has good formability and high anti-collision absorption energy, so it is widely used in automobile suspension systems, insurance Bars, wheels and reinforcements and other parts. At present, the strength level of cold-rolled dual-phase steel has grown from 440MPa to 1470MPa, and the strength level of 780MPa and below has been widely used in automobile panels, structural pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/18C22C38/14C22C38/12C22C38/04C21D8/02B21B1/22
CPCB21B1/22C21D8/0226C21D8/0247C22C33/04C22C38/04C22C38/12C22C38/14C22C38/18
Inventor 王健于世川马德刚乔治明师可新刘丽萍张春花马光宗武冠华牟海鹏
Owner TANGSHAN IRON & STEEL GROUP
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