SAE 4140 Alloy Steel Round Bar

SAE 4140 Round Bar is high strength, toughness, and wear resistance, suitable for various applications such as gears, shafts, and machinery components.

SAE 4140 alloy steel round bars are renowned for their exceptional strength, toughness, and wear resistance, making them ideal for a wide range of applications in various industries.

Chemical Composition:

• Carbon (C): 0.38% - 0.43%
• Silicon (Si): 0.15% - 0.35%
• Manganese (Mn): 0.75% - 1.00%
• Phosphorus (P): Maximum 0.035%
• Sulfur (S): Maximum 0.040%
• Chromium (Cr): 0.80% - 1.10%
• Molybdenum (Mo): 0.15% - 0.25%

Mechanical Properties:

• Tensile Strength: Typically 850 - 1000 MPa
• Yield Strength (0.2% offset): Typically 625 - 700 MPa
• Elongation at Break: Typically 10 - 20%
• Hardness (Brinell): Typically 197 - 229 HB

Heat Treatment:

• Annealing: 800°C - 850°C, furnace cooling
• Normalizing: 870°C - 920°C, air cooling
• Hardening: 830°C - 870°C, oil quenching
• Tempering: 480°C - 700°C, air cooling

Applications:

• Gears
• Shafts
• Bolts
• Crankshafts
• Axles
• Tool holders
• Hydraulic machinery components

4140 alloy steel round bars are commonly used in machinery, automotive, and aerospace industries due to their excellent combination of strength, toughness, and wear resistance. Always adhere to relevant standards and specifications for accurate information and best practices.