SCM440 is a type of medium-carbon Cr-Mo alloy steel specified in Japanese standards. Chromium provides good hardness permeability and Molybdenum gives hardness uniformity and high strength. The steel has good ductility and resistance to high-temperature stress, is characterized by structural stability, low harmful elements, small decarburization layer, fewer surface defects, etc.
SCM440 has better strength and good comprehensive mechanical properties after heat treatment, and is easier to process under heat treatment. It has excellent quenchability, can be deeply quenched and the temper brittleness tendency is less, widely used in the production of high strength steel fasteners such as engine, mold, motor, gear, transmission parts, shaft, arm, cold forging parts, screw, etc..
Standards: JIS G4051, JIS G4053
Size: φ15 - 200mm
Forms: Round bar
Delivery condition: Cold drawing, hot rolling, forging
The Equivalent Standards:
The Mechanical Properties
Tensile Strength (kgf/mm²)
Yield Strength 0.2% (MPa)
Elongation -% in 50 mm (min.)
Heat Treatment Condition
• Annealing: furnace cooling at 830℃
• Normalization: air cooling at room temperature of 830~880℃
• Quenching: 830~880℃ oil cooling
• Tempering: 530~630℃ rapid cooling
World iron&steel is a professional supplier of alloy steel rods and bars. We manufacture and distribute high quality SCM440 steel round bar for gear application in accordance with JIS G4053 standards, specified delivery conditions and final customer specifications for industrial and commercial applications. Special sizes of steel bars and delivery issues can be further negotiated and we provide a wide range of solutions for purchasing departments to select alternative grades, contact us today!