| abstract |
The present invention provides a kind of tufftride steel, and it contains C in terms of quality %：0.01% less than 0.10%, Si：Less than 1.0%, Mn：0.5~3.0%, P：Less than 0.02%, S：Less than 0.06%, Cr：0.3~3.0%, Mo：0.005~0.4%, V：0.02~0.5%, Nb：0.003~0.15%, Al：0.005~0.2% and Sb：0.0005~0.02%, remainder is made up of Fe and inevitable impurity, and bayesian body phase is based on relative to the area occupation ratio for organizing entirety more than 50%, thus there is excellent machining property in tufftride before processing, excellent fatigue properties are shown after tufftride processing, the mechanical realization part of automobile etc. is perfectly suitable for. |