Zinc-plated double-phase steel and production method thereof

A dual-phase steel and fire production line technology, applied in the field of cold-rolled steel, can solve the problems of unutilized production line, production efficiency and production capacity reduction, and achieve the characteristics of improving production efficiency and austenite hardenability, Alloy smelting simple effect

Active Publication Date: 2016-11-09
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron and steel enterprises, when the production task of cold-rolled galvanized dual-phase steel increases, they can only produce in the production lines that are suitable for them, and cannot fully utilize all production lines, resulting in a reduction in production efficiency and production capacity

Method used

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  • Zinc-plated double-phase steel and production method thereof
  • Zinc-plated double-phase steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The molten iron is subjected to KR desulfurization treatment, conventional converter smelting, LF+RH refining treatment, RH calcium treatment, and then continuous casting; the slab smelting composition is: C: 0.095%, Si: 0.15%, Mn: 1.50%, P: 0.010 %, S: 0.003%, Alt: 0.035%, Cr: 0.20%, Mo: 0.29%, N: 0.003%, and the rest are iron and other unavoidable impurities.

[0049] The slab is heated at 1270°C for 3.1 hours, the final rolling temperature is 880°C, and the coiling temperature is 660°C; then it is decoiled on the pickling mill to straighten and break phosphorus, and then enters a shallow tank for turbulent pickling to remove its surface oxide scale After entering the 5-stand cold tandem rolling mill, the reduction rate is 65%; the final annealing unit entrance is uncoiled and cleaned, and then enters the vertical annealing furnace. 700°C, cooling rate: 3.5°C / s, outlet temperature of the fast cooling section is 460°C, cooling rate: 23°C / s, then enters the galvanizing ...

Embodiment 2

[0051] The molten iron is subjected to KR desulfurization treatment, conventional converter smelting, LF+RH refining treatment, RH calcium treatment, and then continuous casting; the slab smelting composition is: C: 0.110%, Si: 0.24%, Mn: 1.45%, P: 0.010 %, S: 0.004%, Alt: 0.055%, Cr: 0.16%, Mo: 0.27%, N: 0.003%, and the rest are iron and other unavoidable impurities.

[0052] The slab is heated at 1260°C for 3.2 hours, the final rolling temperature is 880°C, and the coiling temperature is 670°C; then it is decoiled on the pickling mill, stretched, straightened, and phosphorus is broken, and then enters a shallow tank for turbulent pickling to remove the surface oxide scale Then enter the 5-stand cold tandem rolling mill with a reduction rate of 75%; the final annealing unit is uncoiled and cleaned at the entrance and then enters the vertical annealing furnace. ℃, cooling rate: 10℃ / s, then enter the galvanizing pot for galvanizing, exit the galvanizing pot for air cooling, and...

Embodiment 3

[0054] The molten iron is subjected to KR desulfurization treatment, conventional converter smelting, LF+RH refining treatment, RH calcium treatment, and then continuous casting; the slab smelting composition is: C: 0.115%, Si: 0.22%, Mn: 1.50%, P: 0.012 %, S: 0.004%, Alt: 0.025%, Cr: 0.15%, Mo: 0.26%, N: 0.002%, and the rest are iron and other unavoidable impurities.

[0055] The slab is heated at 1230°C for 3.2 hours, the final rolling temperature is 860°C, and the coiling temperature is 660°C; then it is decoiled on the pickling mill to straighten and break phosphorus, and then enters a shallow tank for turbulent pickling to remove the surface oxide scale After entering the 5-stand cold tandem rolling mill, the reduction rate is 65%; the final annealing unit entrance is uncoiled and cleaned and then enters the vertical annealing furnace. 700°C, cooling rate: 5.0°C / s, outlet temperature of the fast cooling section is 460°C, cooling rate: 23°C / s, then enters the galvanizing p...

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Abstract

The invention belongs to the technical field of cold rolled steel and discloses zinc-plated double-phase steel and a production method of the zinc-plated double-phase steel. The zinc-plated double-phase steel comprises, by weight percentage, 0.085%-0.115% of C, 0.15%-0.24% of Si, 1.45%-1.55% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.025%-0.065% of Alt, 0.14%-0.24% of Cr, 0.24%-0.29% of Mo, not larger than 0.006% of N and the balance Fe and other inevitable impurities. The production method includes the steps of KR desulfuration, converter steelmaking, LF+RH refining treatment, RH calcium treatment, continuous steel casing, billet heating, rough rolling, finish rolling, laminar cooling and winding; unwinding, acid pickling, cold continuous rolling and winding; and unwinding, cleaning, annealing, zinc plating, finishing and winding. Through composition design and process control, the zinc-plated double-phase steel is suitable for annealing production lines having the rapid cooling segment or not.

Description

technical field [0001] The invention relates to the technical field of cold-rolled steel, in particular to a galvanized dual-phase steel and a production method thereof. Background technique [0002] Cold-rolled strip steel is mainly used in industries such as automobiles and home appliances. In recent years, my country's automobile production has grown by leaps and bounds, which has greatly expanded the market capacity of cold-rolled sheets, especially galvanized sheets. The company positions cold-rolled galvanized sheet as a high-quality, high-value-added fist product. In addition, with the rapid development of the automobile industry, in order to reduce the energy consumption of automobiles, the weight of automobile bodies must be reduced, which requires more use of high-strength steel in automobiles. In view of the above two points, the demand and requirements of the modern automobile industry for cold-rolled galvanized high-strength steel are getting higher and higher. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/12C21D8/02C21D6/00
CPCC21D6/005C21D8/0226C21D8/0236C21D8/0273C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 王勇围邝霜韩赟姜英花黄学启季晨曦李一丁孙建立张环宇庞二帅王保勇韩志刚鲍成人
Owner SHOUGANG CORPORATION
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