High-strength steel for aluminum-coated base plate and production method thereof

Abstract

The invention discloses steel for an aluminum-coated base plate and a production method thereof. The steel comprises, by weight, 0.03%-0.06% of C, no more than 0.005% of Si, 0.4%-0.8% of Mn, no more than 0.015% of P, no more than 0.005% of S, no more than 0.005% of Al, 0.0062%-0.02% of N, 0.006%-0.05% of O, 0.002%-0.004% of Ca, 0.01%-0.03% of Ti and the balance Fe and inevitable impurities; and meanwhile, the sum of the contents of O and N is larger than or equal to 0.013%, and the relation of 0.5<=(O+N) / (P+S)<=5 is met. According to the steel for the aluminum-coated base plate, the yield strength is 280-400 MPa, the tensile strength is 420 MPa or above, and the elongation rate A50% is 28% or above; the steel can be used for production of an aluminum-coated plate strip, the related plate strip can be composited with materials such as aluminum with better radiating performance, accordingly, the radiating problem of wheels is solved, and the steel is used for manufacturing the wheels, radiating devices, corrosion resistant boxes and the like.

Description

technical field [0001] The invention relates to a steel for aluminum-clad substrates and a production method thereof, which can be used in the production of aluminum-clad strips for manufacturing wheels, heat dissipation parts, corrosion-resistant boxes, etc., and belongs to the field of low-alloy steel manufacturing. Background technique [0002] The wheel is one of the important parts of the car body. It bears periodic tension and compression loads during service. At the same time, the steel plate undergoes welding, stamping and other processing procedures during the production and processing of the wheel. Therefore, steel for wheels requires good welding, fatigue and cold working properties. Prior to the present invention, multiple patents have been declared for wheel steel and its manufacturing method at home and abroad. In view of the strict requirements on the composition and inclusions of steel for wheels, Chinese Patent Publication No. CN101603146A "Smelting Process...

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Problems solved by technology

[0005] In addition, the "Aluminum-coated steel strip for cooler and its preparation method and the steel strip and aluminum alloy strip" disclosed in Chinese Patent Publication No. CN102019727A introduces the aluminum-coated steel strip used for the cooling fin of the cooler, the substrate and the aluminum film used composition, but the steel strip involved has relatively high Si and Al composition, and does not involve O and N composition, mainly focusing on aluminum-clad steel strip

[0006] Chinese Patent Publication No. CN101550519A discloses "a hot-rolled dual-phase steel plate for wheels and its production method", which introduces a method of producing automobile wheels with relatively simple composition design, but the steel plates involved still have the problem of poor heat dissipation of the wheels

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