... (external diameter Φ1300) features: 1) Material: Q235B, Q345B, 35#, 45#2) Heat treatment :hardening and tempering,high frequency quenching,carburizing quenching ... : HRC45-554) Groove surface quench depth: ≥2mm5) Max processing diameter: 2,000mm6) Short production period7)Inspection:all items are checked and ... customer service. cast iron sheave for crane , port machine , oil drilling rig