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510MPa grade hot rolling acid-pickling-free automobile structural steel plate and production method thereof

A technology of automobile structure and production method, which is applied in the field of metallurgy, can solve the problems of high production cost and increased pickling process, and achieve the effect of low production cost, simple process and high cost performance

Inactive Publication Date: 2018-04-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The chemical composition design of hot-rolled steel sheets for 510MPa-grade automobile structures is generally adopted at home and abroad with low C-Mn-V microalloying schemes. Controlled rolling and controlled cooling is adopted, and its technical feature is that more consideration is given to the solid solution strength of alloy elements and the effect of fine grain strengthening, but it needs to increase the pickling process in the later stage, and there are high production costs and additional costs for environmental protection of waste acid.

Method used

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  • 510MPa grade hot rolling acid-pickling-free automobile structural steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a. Molten steel smelting: The smelting equipment is a 220-ton re-blowing converter. The blast furnace molten iron is used as raw material. The temperature of the blast furnace molten iron is 1375°C. Add steelmaking auxiliary materials and smelt to 1678°C to tap the molten steel tank. Add 1000Kg aluminum-iron alloy ( Anyang Jiaxin Refractories Co., Ltd.), and then add pitch coke (Panzhihua Yangcheng Metallurgical Auxiliary Materials Co., Ltd.) and silicon-manganese alloy (Dechang Ferroalloy Co., Ltd.) to the deoxidized molten steel, so that the content of each component in the molten steel is (Based on the total weight of molten steel, wt%) C: 0.07, Si: 0.09, Mn: 1.15, P: 0.010, S: 0.005, Nb: 0.022, Ti: 0.015, Al: 0.04, N: 0.0040, and the rest are Fe. Subsequently, the molten steel tank is treated with bottom blowing argon gas on the small platform outside the furnace, the pressure of argon gas is 200-500 Pa, and the time is 4 minutes.

[0037] By controlling the amount...

Embodiment 2

[0044] The preparation method is basically the same as in Example 1, except that the components of molten steel obtained by converter smelting are C: 0.08, Si: 0.10, Mn: 1.12, P: 0.013, S: 0.006, Nb: 0.020, Ti: 0.013, Al: 0.05 , N: 0.0036, the rest is Fe, (weight percent, %) and the hot-rolled steel plate produced with the aforementioned molten steel, the temperature of the slab out of the furnace is 1220°C, the rolling speed of the finish rolling is 1.72m / s, and the rolling speed of the final rolling outlet is 8.5m / s s; the final rolling temperature is 885°C, the coiling temperature is 580°C, and the thickness of the hot-rolled finished product is 6.0mm.

[0045] The mechanical properties of the prepared coils were tested, and the yield strength Rel, tensile strength Rm and elongation A at room temperature were detected respectively. The tensile properties were carried out according to the room temperature tensile test method of GB / T228 metal materials. The yield strength (Re...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a 510MPa grade hot rolling acid-pickling-free automobile structural steel plate and a production method thereof.The 510MPa grade hot rolling acid-pickling-free automobile structural steel plate is characterized by comprising the following chemical components in percentage by weight: 0.06%-0.09% of C, 0.05%-0.15% of Si, 1.10%-1.20% of Mn, 0.002%-0.006% of N, 0-0.025% of P, 0-0.015% of S, 0.015%-0.030% of Nb, 0.010%-0.030% of Ti, 0.02%-0.06% of Al and the balance of Fe and unavoidable impurities. With adoption of the production method, through controlling proper chemical components, the technological conditions of proper hot rolling heating temperature, finish rolling temperature and coiling temperature and the like are cooperated to finally obtain a steel belt finished product; and the yield strength of the steel belt finished product is equal to or greater than 355MPa, the tensile strength is equalto or greater than 510MPa, the ductility is equal to or greater than 24% and the cold bending property is high.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 510MPa grade hot-rolled pickling-free automotive structural steel plate and a production method thereof. Background technique [0002] Hot-rolled coils are used for rust removal and rust prevention. The surface treatment has been using pickling, cold rolling, hot-dip galvanizing or coating technology. These technologies have broadened the scope of use of the plate, but the production cost is generally high and unavoidable. To a certain degree of pollution to the environment, the pickling-free steel developed for the improvement of the structure and thickness of the oxide layer can effectively solve this problem. According to the needs of modern automobiles such as "energy saving, emission reduction, environmental protection, and safety", automobile manufacturers put forward requirements for the development of steel products that can be free of pickling for steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C21D8/02C21C7/06
CPCC22C38/04C21C7/0056C21C7/06C21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 刘庆春张功庭郑之旺许哲峰
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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