Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet

A technology of automobile structure and production method, applied in the field of steel rolling, can solve the problem of high cost, achieve the effects of low production cost, solving waste acid pollution and significant social benefits

Inactive Publication Date: 2015-08-26
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid-washed sheet for automobile structure produced by this method has excellent performance, but the cost is high

Method used

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  • Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet
  • Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In terms of weight percentage, the chemical composition of the billet is: C: 0.07%, Si: 0.03%, Mn: 1.10%, P: 0.011%, S: 0.003%, Als: 0.036%, and the rest is Fe and unavoidable impurities.

[0027] Its production process is: billet → hot rolling → laminar cooling → coiling → leveling → pickling → oiling → finished product. After being heated at 1200°C, the 220mm thick steel billet is rough rolled into a 35mm thick intermediate billet through two reversible rough rolling mills for 6 passes. The rough rolling reduction rate is 84.1%. A 2.8mm thick steel coil was rolled by 7 passes, the finishing rolling reduction rate was 92.0%, and the final rolling temperature was 850°C. After the steel coil is cooled by laminar flow, it enters the coiler to obtain the strip steel, and the coiling temperature is 580°C. After the temperature of the steel coil is lower than 50 degrees, the steel coil is transported to the leveling unit for leveling, and the leveling elongation rate is 1.2...

Embodiment 2

[0030] In terms of weight percentage, the chemical composition of the billet is: C: 0.08%, Si: 0.03%, Mn: 1.08%, P: 0.012%, S: 0.005%, Als: 0.042%, and the rest is Fe and unavoidable impurities.

[0031] Its production process is: billet → hot rolling → laminar cooling → coiling → leveling → pickling → oiling → finished product. After being heated at 1200°C, the 220mm thick steel billet is rough rolled into a 40mm thick intermediate billet through two reversible rough rolling mills for 6 passes. The rough rolling reduction rate is 81.8%. The 3.5mm-thick steel coil was rolled by 7 passes, the final rolling reduction rate was 91.3%, and the final rolling temperature was 850°C. After the steel coil is cooled by laminar flow, it enters the coiler to obtain the strip steel, and the coiling temperature is 590°C. After the temperature of the steel coil is lower than 50 degrees, the steel coil is transported to the leveling unit for leveling, and the leveling elongation rate is 1.2%....

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Abstract

The invention discloses a hot-rolling pickle sheet for a 400MPa-level automobile structure and a production method of the pickle sheet. Main elements of the hot-rolling pickle sheet comprise 0.06 percent to 0.08 percent of C, Si smaller than or equal to 0.05 percent, 1.0 percent to 1.15 percent of Mn, 0.02 percent to 0.05 percent of Al, P smaller than or equal to 0.015 percent, S smaller than or equal to 0.008 percent, and the balanced Fe and trace elements. When the hot-rolling pickle sheet with the thickness of 2 mm to 6 mm is rolled, the heating temperature ranges from 1160 DEG C to 1220 DEG C, the final rolling temperature ranges from 820 DEG C to 860 DEG C, a front-segment-area rapid cooling mode is adopted in a cooling mode, and the reeling temperature ranges from 560 DEG C to 600 DEG C. Low-carbon low-silicon component design is adopted, and through control over the technology in the rolling process and the acid pickling process, the hot-rolling pickle sheet for the automobile structure can be produced and is good in surface quality and stamping performance.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a 400MPa grade hot-rolled pickling plate for automobile structures and a production method thereof. Background technique [0002] In 2014, China's automobile output has exceeded 23 million, and it has maintained its position as the world's largest automobile producer for six consecutive years. The demand for steel plates for automobile structures is increasing. At present, steel plates used in automotive structural parts are mainly ordinary carbon structural steel or low alloy structural steel. In order to reduce the production cost of ordinary carbon structural steel and low alloy structural steel, C is usually used as the main solid solution strengthening element of the steel, and the C content is 0.15-0.2%. [0003] Such as patent CN102912229A, chemical composition of slab: C0.15%~0.20%, Si 0.05%~0.20%, Mn0.1%~0.5%, B0.0005%~0.004%, N≤0.0060%, Al0.02% ~0.05...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02C23G1/08C23G1/04
Inventor 岳重祥汤茜李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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