Cold-rolled high-strength steel used for automobile structural member and manufacture method of cold-rolled high-strength steel

A technology for automobile structure and cold-rolled steel plate, which is applied in the production and manufacture of high-strength cold-rolled steel plate, cold-rolled steel plate and steel plate manufacturing field. The grain is uniform and fine, and the effect of improving the yield

Inactive Publication Date: 2018-01-16
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The relevant steel plates and manufacturing methods provided by the above-mentioned patents, the patents (CN103469065A, CN104250703A) adopt bell furnace for annealing production, and the surface quality of the manufactured steel plates is difficult to guarantee; Oxide layer, resulting in surface defects; patents (CN103469065, CN105714186A, CN105925903A) only add Nb element, and the alloy cost is relatively high

Method used

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  • Cold-rolled high-strength steel used for automobile structural member and manufacture method of cold-rolled high-strength steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition of the continuously cast slab obtained by RH refining and casting is as follows (mass percentage): C, 0.06%; Mn, 0.79%; Si, 0.01%; P, 0.014%; S, 0.0041%; Als, 0.034%; %; Ti, 0.015%; the balance is Fe and unavoidable impurities. The continuous casting slab is heated to 1210°C in a walking heating furnace, the holding time is 155min, the final rolling temperature is 870°C, the front cooling is adopted, and the coiling temperature is 582°C to obtain a 4.0mm thick hot-rolled steel coil; hot-rolled coil Pickling after uncoiling, continuous rolling by 5-stand rolling mill to obtain 1.5mm thick rolled hard steel coil, the cold rolling reduction is 62.5%. After the hard-rolled steel coil is uncoiled, the steel plate enters the continuous annealing furnace after surface cleaning. The annealing soaking temperature is 767°C, the soaking holding time is 125s, and the smooth elongation is 1.91%.

[0028] The high-strength steel manufactured according to the above co...

Embodiment 2

[0030] The composition of the continuously cast slab obtained by RH refining and casting is as follows (mass percentage): C, 0.07%; Mn, 0.82%; Si, 0.01%; P, 0.009%; S, 0.006%; Als, 0.036%; %; Ti, 0.014%; the balance is Fe and unavoidable impurities. The continuous casting slab is heated to 1210°C in a walking heating furnace, the holding time is 165min, the final rolling temperature is 861°C, the front cooling is adopted, and the coiling temperature is 575°C to obtain a 3.5mm thick hot-rolled steel coil; hot-rolled coil After uncoiling, it is pickled and continuously rolled by a 5-stand rolling mill to obtain a 1.2mm thick hard steel coil with a cold rolling reduction of 65.7%. After the hard-rolled steel coil is uncoiled, the steel plate enters the continuous annealing furnace after surface cleaning. The annealing soaking temperature is 787°C, the soaking time is 105s, the elongation of flattening is 1.80%, and the elongation of tension straightening is 0.2%.

[0031] The hi...

Embodiment 3

[0033] The composition of the continuously cast slab obtained by RH refining and casting is as follows (mass percentage): C, 0.06%; Mn, 0.90%; Si, 0.01%; P, 0.014%; S, 0.0042%; Als, 0.035%; %; Ti, 0.019%; the balance is Fe and unavoidable impurities. The continuous casting slab is heated to 1230°C in a walking heating furnace, the holding time is 155min, the final rolling temperature is 878°C, the front cooling is adopted, and the coiling temperature is 584°C to obtain a 3.5mm thick hot-rolled steel coil; hot-rolled coil After uncoiling, it is pickled and rolled continuously by a 5-stand rolling mill to obtain a 1.0mm thick rolled hard steel coil with a cold rolling reduction of 71.4%. After the hard-rolled steel coil is uncoiled, the steel plate enters the continuous annealing furnace after surface cleaning. The annealing soaking temperature is 778°C, the soaking holding time is 84s, and the smooth elongation is 1.63%.

[0034] The high-strength steel manufactured according ...

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Abstract

The invention discloses a cold-rolled steel plate used for manufacturing automobile structural components and a manufacture method of the steel plate. The steel plate comprises, by weight percentage,0.06-0.08% of C, 0.65-0.95% of Mn, no more than 0.05% of Si, no more than 0.015% of P, no more than 0.015% of S, 0.030-0.055% of Als, 0.025-0.040% of Nb, and 0.010-0.030% of Ti, with the balance beingFe and inevitable impurities. A continuous casting slab containing the chemical components above undergoes hot rolling, acid-pickling cold continuous rolling, continuous annealing, flattening, and tension leveling to obtain a high-strength steel plate having the yield strength of 330-400 MPa, the tensile strength of 410-500 MPa, and the elongation at break no less than 25.0%. The method is low inproduction cost, and the obtained steel plate is stable in mechanical property, excellent in stamping performance, and superior in surface quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgical industry, and relates to the production and manufacturing technology of high-strength cold-rolled steel plates. Furthermore, the present invention relates to a cold-rolled steel plate with a yield strength of 330MPa-400MPa, which is used for the manufacture of automotive structural parts, and a method for manufacturing the steel plate. Background technique [0002] With the continuous improvement of requirements for energy saving, environmental protection, and collision safety performance, high-strength automotive steel plates are widely used in the design and manufacture of automobile bodies, and the application proportion of high-strength steel parts on the body has reached 40%-80%. Among them, when the internal structural parts of the automobile are produced, the steel plate is generally required to have good stamping performance and welding performance; at the same time, in order to ensu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/14C22C38/02C22C38/04C22C38/06B21C37/02
Inventor 张志建李腾飞刘志桥李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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