High carbon bearing steel and its manufacturing method

摘要

PROBLEM TO BE SOLVED: To disclose a high carbon bearing steel and a method for manufacturing the same. The present invention relates to a technical field of microstructure miniaturization and homogenization of bearing steel, particularly high carbon bearing steel and a method for producing the same. The chemical composition of the high carbon bearing steel of the present invention is C: 0.80 to 1.20 wt%, Cr: 0.40 to 2.0 wt%, Mn: 0.15 to 0.75 wt%, Si: 0.15. ~ 0.75 wt%, Nb: 0 to 0.20 wt%, Mo: 0 to 0.20 wt%, V: 0 to 0.20 wt%, P ≤ 0.015 wt%, S ≤ 0.01 wt%, the rest is Fe It is an unavoidable impurity. The contents of Nb, Mo and V are not 0 at the same time. The present invention effectively refines the matrix structure of the bearing steel by adding the microalloy elements Nb, Mo, V to the high carbon bearing steel so as to be combined with other elemental compositions, and precipitates a large number of nanocarbides. Can be promoted and the contact fatigue life of high carbon bearing steel can be extended. [Selection diagram] Fig. 1