35CrMo (GB/T 3077) is a chromium-molybdenum alloy round steel engineered for extreme stress, with standout mechanical properties:
Tensile strength: 980–1175 MPa after quenching (850°C) and tempering (550°C), enabling it to withstand heavy loads in oil drill collars and crane shafts.
Yield strength: ≥835 MPa, ensuring minimal deformation under sustained stress (e.g., in engine connecting rods).
Impact toughness: ≥63 J at 20°C (Charpy V-notch), resisting fracture during sudden impacts-vital for mining machinery operating in rugged conditions.
Hardness: 229–286 HB after heat treatment, balancing wear resistance and machinability for complex parts like gearboxes.
These traits stem from its chemistry: 0.32–0.40% C, 0.17–0.37% Si, 0.40–0.70% Mn, 0.80–1.10% Cr, and 0.15–0.25% Mo (which enhances high-temperature strength). 35CrMo is equivalent to ASTM A193 B7 (USA) and DIN 1.7220 (Germany), with Made-in-China listings promoting it as "35CrMo Alloy Steel Round Bar for High-Pressure Equipment."