Features and Scope: strength, high hardenability, toughness, and quenching small deformation, high temperature strength and high creep rupture strength. Requirements for the manufacture of high strength steel than 35CrMo and quenched forging greater cross-section, such as a big locomotive traction gears, supercharger drive gear, the rear axle, a great link by the load and spring clip can also be used The following 2000m deep oil drill pipe joints and Salvage tools.

Chemical Composition: Carbon C: 0.38 ~ 0.45 ,Si Si: 0.17 ~ 0.37 ,Manganese Mn: 0.50 ~ 0.80 ,S S: to allow the residual content ≤ 0.035 ,P P: ≤ 0.035Chromium Cr: 0.90 ~ 1.20 ,Ni-Ni: ≤ 0.03,Cu: ≤ 0.030 ,Mo Mo: 0.15 ~ 0.25