Steel for aluminum-clad substrate and production method thereof

Abstract

The invention discloses steel for an aluminum-coated substrate and a production method. The steel is prepared from, by weight, 0.005-0.03% of C, 0.005% or less of Si, 0.2-0.6% of Mn, 0.015% or less ofP, 0.005% or less of S, 0.005% or less of Al, 0.006-0.02% of N, 0.006-0.05% of O and the balance Fe and inevitable impurities, wherein the ingredient content meets the formulas: O+N>=0.013% and 0.5<=(O+N) / (P+S)<=5. The matrix structure of the steel for the aluminum-coated substrate is ferrite and bainite. According to the steel for the aluminum-coated substrate, the yield is 200-320 MPa, the strength of extension is 320 MPa or above, and the ductility A50% is 35% or above. The steel for the aluminum-coated substrate has excellent toughness and steel-aluminum interface combining performance, has the good heat dissipation and corrosion resistance effect after being coated with aluminum, and can be used for manufacturing of automobile wheels, heat dissipation devices, anti-corrosion boxes and the like.

Description

technical field [0001] The invention relates to a steel for aluminum-coated substrates and a production method thereof. It has good steel-aluminum interface bonding performance, is suitable for the production of aluminum-coated strip steel, has good heat dissipation and corrosion resistance effects, and can be used for wheels, heat dissipation devices and The production of corrosion-resistant boxes, etc., 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. For ex...

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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 involved steel strips have relatively high Si and Al compositions, and do not involve O and N composition control requirements, mainly focusing on aluminum-clad steel strips

[0006] Chinese Patent Publication No. CN104294144A discloses "a steel for automobile wheel rim with tensile strength ≥ 380 MPa and its production method", which introduces a method of producing steel for automobile wheel with relatively simple composition design, but the steel plates involved still exist. The problem of poor heat dissipation

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