Hot-rolled pickled plate with excellent formability for automobile structure and production method thereof

A hot-rolled pickling, automobile structure technology, applied in metal rolling, metal rolling, rolling mill control device and other directions, to achieve the effect of simple method, good surface quality and good welding performance

Inactive Publication Date: 2012-10-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel grades in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example one

[0030] In terms of weight percentage, the chemical composition of the billet is: C: 0.05%, Si: 0.05%, Mn: 0.15%, Cr: 0.20%, Ti: 0.010%, P: 0.011%, S: 0.010%, Als: 0.022% , The rest is Fe and unavoidable impurities.

[0031] The production process is: billet → hot rolling → laminar cooling → coiling → welding head and tail → pickling → leveling → oiling → finished product. After the billet is heated at 1220℃, it is rough-rolled into a 35mm thick intermediate billet by two reversible roughing mills in 6 passes, with a roughing reduction rate of 82.5%, and then enters the finishing mill after being insulated by the hot coil box and rolled into For 1.8mm thick steel coils, the finishing rolling reduction ratio is 94.9%, and the finishing temperature is 850°C. The steel coil is cooled by laminar flow and then enters the coiler to obtain strip steel. The cooling rate is 19.5°C / s, and the temperature in the coiling step is 702°C. The strip steel is pickled after we...

Example Embodiment

[0033] Example two

[0034] In terms of weight percentage, the chemical composition of the billet is: C: 0.07%, Si: 0.04%, Mn: 0.25%, Cr: 0.25%, Ti: 0.015%, P: 0.010%, S: 0.008%, Als: 0.028% , The rest is Fe and unavoidable impurities.

[0035] The production process is: billet → hot rolling → laminar cooling → coiling → welding head and tail → pickling → leveling → oiling → finished product. After the billet is heated at 1230℃, it is rough-rolled into a 38mm thick intermediate billet in 6 passes by two reversible roughing mills, with a rough rolling reduction rate of 81%, and then enters the finishing mill after being insulated by the hot coil box and rolled into it. For 2.5mm thick steel coils, the finishing reduction ratio is 93.4% and the finishing temperature is 870°C. The steel coil is cooled by laminar flow and then enters the coiler to obtain strip steel. The cooling rate is 18.4°C / s, and the temperature in the coiling step is 715°C. The strip steel is pickled after wel...

Example Embodiment

[0037] Example three

[0038] In terms of weight percentage, the chemical composition of the billet is: C: 0.08%, Si: 0.03%, Mn: 0.32%, Cr: 0.32%, Ti: 0.02%, P: 0.015%, S: 0.007%, Als: 0.042% , The rest is Fe and unavoidable impurities.

[0039] The production process is: billet → hot rolling → laminar cooling → coiling → welding head and tail → pickling → leveling → oiling → finished product. After the billet is heated at 1250°C, it is rough-rolled into a 37mm thick intermediate billet in 6 passes by two reversible roughing mills, with a roughing reduction rate of 81.5%, and then enters the finishing mill after being insulated by the hot coil box and rolled into For 4.0mm thick steel coils, the finishing reduction ratio is 89.2%, and the finishing temperature is 880°C. The steel coil is cooled by laminar flow and then enters the coiler to obtain strip steel. The cooling rate is 17.7°C / s, and the temperature in the coiling step is 740°C. The strip steel is pickled after the hea...

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PUM

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Abstract

The invention provides a hot-rolled pickled plate with excellent formability for an automobile structure. The plate comprises, in terms of weight percent, 0.05 to 0.10% of C, no more than 0.05% of Si, 0.15 to 0.50% of Mn, 0.20 to 0.40% of Cr, 0.01 to 0.02% of Ti, no more than 0.02% of P, no more than 0.010% of S and 0.02 to 0.07% of Als, with the balance being Fe and unavoidable impurities. According to a production method for the hot-rolled pickled plate provided in the invention, the hot-rolled pickled plate with excellent formability for an automobile structure is produced by controlling the parameters of chemical components in steel, a hot rolling process, a pickling process and the like. The hot-rolled pickled plate in the invention has excellent comprehensive properties like high strength, good welding performance and good surface quality; and the production method in the invention has the advantages of small process control difficulty, strong operationality, simpleness, low cost and the like.

Description

technical field [0001] The invention relates to a hot-rolled pickled sheet and a production method thereof, more specifically, to a hot-rolled pickled sheet for automotive structures with excellent formability and a production method thereof. Background technique [0002] The hot-rolled pickled plate is made of high-quality hot-rolled thin plate, which is made by removing the oxide layer, trimming and finishing by the pickling unit. The main processing procedures of the hot-rolled pickled plate include laser welding, turbulent pickling, On-line leveling, edge trimming, on-line oiling, etc., whose surface quality and use requirements are between hot-rolled and cold-rolled sheets, it is an ideal substitute for some hot-rolled and cold-rolled sheets. [0003] The advantages of hot-rolled pickled plate are: 1) Good surface quality, because the hot-rolled pickled plate removes the surface oxide scale, improves the surface quality of steel, and is convenient for welding, oiling an...

Claims

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Application Information

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IPC IPC(8): C22C38/28B21B37/00C23G1/08C23G3/02
Inventor 李正荣李军向安平李卫平翁建军张列任守斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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