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Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof

A tensile strength and alloying technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of high economic cost, increased difficulty in smelting control, inconsistent performance, etc. Simple, excellent anti-pulverization performance, good plasticity

Active Publication Date: 2015-10-21
武汉钢铁有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The tensile strength of its products is about 340MPa, which can achieve better coating surface quality, but it adds precious metal Nb elements, and its performance is extremely sensitive to P, S, O elements, improper control can easily lead to inconsistent performance, resulting in The difficulty of smelting control increases, and the economic cost is higher

Method used

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  • Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof
  • Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof
  • Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof

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Embodiment Construction

[0033] The present invention is described in detail below:

[0034] Table 1 is the value list of each embodiment of the present invention and comparative example;

[0035] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0036] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0037] Each embodiment of the present invention is produced according to the following steps:

[0038] 1) Pretreatment of molten iron, the molten iron after pre-desulfurization treatment, control S≤0.005%, Si: 0.20~0.80%, Mn≤0.40%, P≤0.15%; and remove the slag;

[0039] 2) Carry out converter smelting and RH treatment, and control the content of each element after refining within the set value range;

[0040] 3) Continuous casting: control the casting speed at 1.1~1.3m / min, and control the cooling speed of the casting slab surface to no more than 200°C / m;

[0041] 4)...

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Abstract

An automobile hot-dip galvanized steel with the tensile strength of 340 MPa grade comprises the components by the weight percentage: 0.06-0.10% of C, less than or equal to 0.03% of Si, 0.40-0.55% of Mn, 0.010-0.025% of P, less than or equal to 0.008% of S, and 0.020-0.070% of Als. A production method comprises the production steps: pretreatment of molten iron; smelting with a converter and treatment with an RH furnace; continuous casting; heating of a casting blank; hot rolling; coiling; pickling; cold rolling; continuous annealing; hot-dip galvanizing; alloying; and finishing. The mechanical properties can be ensured, that is to say, the yield strength is 250-280 MPa, the tensile strength is 340-390 MPa, the extension rate A is more than or equal to 40%, the roughness is 0.6-1.5 [mu]m, the PC value is more than or equal to 90 / cm, and the pulverization performance level does not exceed 2 grade; the automobile hot-dip galvanized steel has simple composition and process, also has relatively good plasticity, besides, has good anti-pulverization performance, and can be used for stamping complex automobile inner plates and structural parts.

Description

technical field [0001] The invention relates to a galvanized steel for automobiles and a production method thereof, in particular to an alloyed hot-dip galvanized steel for automobiles with a tensile strength of 340 MPa and a production method thereof. Background technique [0002] Alloyed hot-dip galvanized steel sheet (GA sheet) has excellent performance in stamping formability, corrosion resistance, coating and weldability, etc., and adapts to the development requirements of automobile lightweight and strong safety, so it has increasingly attracted the attention of the automobile industry. attention. This is because in order to meet the anti-corrosion requirements of the automobile body, the quality of the coating must be controlled at 40g / m 2 Above, the production cost of electro-galvanized sheet increases sharply with the increase of coating thickness. Therefore, how to ensure the corrosion resistance of the steel surface without increasing the production cost has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C23C2/06C23C2/40
Inventor 杜小峰孙方义潘立波陈宇王立辉杜蓉冯冠文刘祥东
Owner 武汉钢铁有限公司
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