Alloy structural steel structural steel for short, 40CrNiMoA is one of structural steel

Species, also known as steel, which is based on high-quality carbon structural steel, due to join one or more of the alloying elements (total content does not exceed 5 percent) and made of steel. Bearing parts after heat treatment of common quality defects: quenching microstructure overheating, less heat, quenching cracks, hardness is not enough, heat deformation, surface removal, soft points.