A kind of low-cost weathering steel for 310mpa grade cold-rolled automobile and its preparation method

A 310mpa, low-cost technology, applied in the field of iron and steel smelting, can solve the problems of high alloy addition and high cost, and achieve the effect of reducing the probability and degree of occurrence, excellent atmospheric corrosion resistance, and improving surface quality

Active Publication Date: 2022-06-17
武汉钢铁有限公司
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Problems solved by technology

[0010] The purpose of the present invention is to provide a low-cost weathering steel for 310MPa grade cold-rolled automobiles and its manufacturing method, so as to solve the problems of many additions and high cost of existing weathering steel alloys

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  • A kind of low-cost weathering steel for 310mpa grade cold-rolled automobile and its preparation method
  • A kind of low-cost weathering steel for 310mpa grade cold-rolled automobile and its preparation method
  • A kind of low-cost weathering steel for 310mpa grade cold-rolled automobile and its preparation method

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Embodiment Construction

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Each embodiment of the present invention is produced according to the following steps:

[0046] (1) Using desulfurized molten iron, the product is smelted and cast into slabs according to the predetermined composition;

[0047] (2) After heating the slab, carry out hot continuous rolling, the heating temperature of hot rolling is 1230~1270℃, and the heat preservation is 130~160min; dephosphorization is carried out, and the hig...

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Abstract

The invention relates to the field of iron and steel smelting, and relates to the production and manufacture of cold-rolled weather-resistant steel for automobiles, in particular to a low-cost weather-resistant steel for 310MPa grade cold-rolled automobiles and a preparation method thereof. The chemical composition and weight percentage of the weathering steel are: C: 0-0.09, Si: 0.10-0.40, Mn: 0.20-0.50, P: 0.05-0.12, S: 0-0.015, Al: 0.010-0.030, Cu: 0.2 ~0.4, the balance is Fe and unavoidable impurities. The present invention mainly adopts measures such as controlling the time of hot rolling in the furnace, the pressure of high pressure water for dephosphorization, and the temperature of rough rolling, so as to reduce the occurrence probability and degree of Cu embrittlement and iron oxide scale. The steel has the characteristics of low cost, excellent surface quality, processing and forming, and excellent atmospheric corrosion resistance. It can be used in industries that require corrosion resistance, such as automobiles and home appliances.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, and relates to the production and manufacture of cold-rolled weathering steel for automobiles, in particular to a low-cost weathering steel of 310MPa grade cold-rolled automobiles and a preparation method thereof. Background technique [0002] Atmospheric corrosion is the interaction of a material with its surrounding atmospheric environment, and ordinary steel materials are easily corroded (rusted) in the atmosphere. According to statistics, 1 / 6 of the world's annual steel production is lost due to corrosion, and my country's annual direct economic loss caused by steel corrosion exceeds 10 billion yuan. [0003] Weathering steel is atmospheric corrosion-resistant steel. A small amount of alloying elements are added to the steel to form a dense layer of about 50-100 μm thick between the rust layer and the substrate. Spinel-type oxide film, due to the existence of this dense oxide film, pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/16C22C38/002C21D8/0226C21D8/0236C21D8/0273C21D8/0242C21D2211/005C21D2211/009
Inventor 周文强李源高俊冯冠文朱东风任彦峰
Owner 武汉钢铁有限公司
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