The Research Of Behavior And Effect And Mechanism Of Rare Earths In Cu-P-RE Weathering Steel

The subject is a part of " The industrial research and key technology of new process and new variety of RE steel " belonged to " Application project of rare earth " which is national "Shiwu" tackling key problem project. The subject number is 2002BA315A05.With the development of national economy construct, rail truck, container and building tower request the steel material to have high strength and toughness except for excellent corrosion resistance. Rare earth can play a key role in increasing the comprehensive function of low alloy steel. It is adapt to our country situation developing RE weathering steel which makes use of the rich rare earth resource in our country. It satisfies the request of new generation high strength and atmosphere corrosion resistance steel at the same time. But the mechanism of action of rare earth in weathering steel is not clear, the study of corrosion resistance mechanism and corrosion products of RE weathering steel is still incomplete, it also only have the general understanding that rare earth can raise corrosion resistance of steel. The conditions make the addition craft and application of rare earth become very blind. The application of RE weathering and the development of new type of steel are restricted. Along with development of the new craft and technique of modern metallurgy, the cleanness of the steel is gradually raised. The mechanism of action of rare earth in the increasingly clean steel certainly will vary. For better developing the Cu- P- RE weathering steel that has the Chinese resources feature, exploiting the new RE weathering steel continuously according to the need of the market at the same time, It is initial and necessary that carrying on the deep study of action and mechanism of rare earth in weathering steel and the optimization study of RE addition craft.This artical takes the clean 10PCuRE steel as the study object, thorough systematically carries on the application study of rare earth in the steel, including various influence of rare earth on nonmetallic inclusion, organization, mechanical property and corrosion resistance...