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Hot-rolled pickled plate for Cr-containing automobile structure and production method thereof

A technology for hot-rolled pickling and automobile structure, which is applied to the hot-rolled pickling plate for automobile structure containing Cr and its production field, and achieves the effects of less difficulty in process control, simple method and good stamping 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 cannot meet this requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In terms of weight percentage, the chemical composition of billet is: C: 0.11%, Si: 0.05%, Mn: 0.60%, Cr: 0.20%, Ti: 0.010%, P: 0.011%, S: 0.010%, Als: 0.022% , and the rest are Fe and unavoidable impurities.

[0030] Its production process is: steel billet → hot rolling → laminar flow cooling → coiling → welding head and tail → pickling → smoothing → oiling → finished product. After the steel billet is heated at 1220°C, it is roughly rolled into a 35mm thick intermediate billet by two reversible rough rolling mills for 6 passes, and the rough rolling reduction rate is 82.5%. 1.8mm thick steel coil, the finishing rolling reduction rate is 94.9%, and the finishing rolling temperature is 850°C. After the steel coil is cooled by laminar flow, it enters the coiler to obtain the strip steel. The cooling rate is 19.5°C / s, and the temperature in the coiling step is 702°C. After the strip is welded head to tail, it is pickled, and the pickling flat elongation rate is 1.0%. F...

Embodiment 2

[0033] In terms of weight percentage, the chemical composition of the billet is: C: 0.13%, Si: 0.04%, Mn: 0.75%, Cr: 0.30%, Ti: 0.015%, P: 0.010%, S: 0.007%, Als: 0.029% , and the rest are Fe and unavoidable impurities.

[0034] Its production process is: steel billet → hot rolling → laminar flow cooling → coiling → welding head and tail → pickling → smoothing → oiling → finished product. After the steel billet is heated at 1230°C, it is roughly rolled into a 38mm thick intermediate billet by two reversible rough rolling mills for 6 passes, and the rough rolling reduction rate is 81%. For a 2.5mm thick steel coil, the final rolling reduction rate is 93.4%, and the final rolling temperature is 870°C. After the steel coil is cooled by laminar flow, it enters the coiler to obtain the strip steel. The cooling rate is 18.4°C / s, and the temperature in the coiling step is 715°C. After the strip is welded head to tail, it is pickled, and the pickling flat elongation is 1.4%. Finall...

Embodiment 3

[0037] In terms of weight percentage, the chemical composition of billet is: C: 0.14%, Si: 0.03%, Mn: 1.10%, Cr: 0.34%, Ti: 0.02%, P: 0.014%, S: 0.007%, Als: 0.043% , and the rest are Fe and unavoidable impurities.

[0038] Its production process is: steel billet → hot rolling → laminar flow cooling → coiling → welding head and tail → pickling → smoothing → oiling → finished product. After the steel billet is heated at 1250°C, it is roughly rolled into a 37mm thick intermediate billet by two reversible rough rolling mills for 6 passes, and the rough rolling reduction rate is 81.5%. For a 4.0mm thick steel coil, the final rolling reduction rate is 89.2%, and the final rolling temperature is 880°C. After the steel coil is cooled by laminar flow, it enters the coiler to obtain the strip steel. The cooling rate is 17.7°C / s, and the temperature in the coiling step is 740°C. After the strip is welded head to tail, it is pickled, and the pickling flat elongation rate is 1.8%. Fina...

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Abstract

The invention provides a hot-rolled pickled plate for a Cr-containing automobile structure. The plate comprises, in terms of weight percent, 0.11 to 0.15% of C, no more than 0.05% of Si, 0.60 to 1.20% 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 for a Cr-containing automobile structure is produced by controlling the parameters of chemical components in steel and 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 and good stamping performance and has a tensile strength reaching 440 MPa grade; 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 plate and a production method thereof, more specifically, to a hot-rolled pickled plate for automobile structures containing Cr 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 and painting; 2...

Claims

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Application Information

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IPC IPC(8): C22C38/28C21D8/02C23G1/08C23G3/02
Inventor 李正荣李军向安平李卫平翁建军李俊洪任守斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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