40cr steel pipe is a kind of round steel with hollow section and no joint around. 40cr steel pipe is made of solid tube billet through perforation, and then by hot rolling, cold rolling or cold drawing. 40Cr steel pipe has a hollow section. Compared with solid steel, such as round steel, the 40Cr steel pipe is a kind of economic section steel, with light weight at the same time of bending and torsional strength
The carbon content is 0.37~0.39%. The best comprehensive ability was obtained by tempering at 50℃ between 39%, and the corresponding value was 0.40-0.41%, should be 510℃, 0.42-0.43%, corresponding to 520℃ tempering, can obtain good comprehensive mechanical properties.
The corresponding relationship between carbon content and tempering temperature of 40Cr steel pipe is that the first step is to guarantee the quenching property of 40Cr steel pipe, and the second is to obtain the best comprehensive property after 40Cr steel pipe tempering.
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