AISI 4140 SCM440 steel round bars is made of medium carbon chromium molybdenum alloy steel, which is an alloy steel containing chromium and molybdenum. It has the advantages of stable composition, low harmful elements, high steel purity, small decarburization layer and few surface defects. It is easy to be spheroidized and has low cold cracking rate.
SCM440 steel round bars have 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, cylinder piston shaft, arm, cold forging parts, screw, etc..
Descriptions Of AISI 4140 SCM440 steel round bars
Standards: JIS G4051, JIS G4053
Size: φ15 – 300mm
Forms: Round bar
Delivery condition: Cold drawing, hot rolling, forging
The Equivalent Standards Of SCM440 Steel Round Bars
EN | ISO | AISI | DIN | GB |
42CrMoS4 | 42CrMo4 | 42CrMo4 | 42CrMo |
Chemical composition
C | Si | Mn | Cr | Mo | Ni | P | S |
0.38-0.43 | 0.15-0.35 | 0.6-0.85 | 0.9-1.2 | 0.15-0.3 | ≦0.25 | ≦0.03 | ≦0.03 |
The Mechanical Properties
Tensile Strength (kgf/mm²) | Yield Strength 0.2% (MPa) | Elongation -% in 50 mm (min.) | Hardness, HB |
≥1080(110) | ≥930(95) | 17 | 285~352 |
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
The Applications Of SCM440 Steel Round Bars
Off-Shore Oil Drilling
Hydraulic Cylinders
Power Generation
Petrochemicals
Gas Processing
Specialty Chemicals
Pharmaceuticals
Pharmaceutical Equipment
Chemical Equipment
Sea Water Equipment
Heat Exchangers
Condensers
