AISI-4140 Round Bar

About AISI-4140 Round Bar

•  Silicon (Si): 0.15-0.35%
• Chromium (Cr): 0.80-1.10%
• Molybdenum (Mo): 0.15-0.25%
• Phosphorus (P): Max 0.025-0.035%
• Sulfur (S): Max 0.025-0.040%

Key Properties:

• Good Toughness and Wear Resistance: Resists wear and is tough enough for demanding applications.
• Good Machinability: Can be machined effectively in the annealed state.
• Good Weldability: Can be welded using standard practices, though pre-heating and post-heating may be required depending on the section size and application.

Common Specifications & Equivalents:

• ASTM: A29
• ASME: SA29
• DIN: 1.6523 / 1.7225
• EN: 10084
• BS: 970 805M20
• JIS: SNCM220

Typical Applications:

• General Engineering: High-stress shafts, spindles, and hydraulic cylinders.
• Manufacturing: Fixtures, jigs, and dies.

Available Forms & Finishes:

• Forms: Round bars, square bars, hexagonal bars, flat bars, and forged shapes.
• Finishes: Hot rolled, cold drawn, bright polished, rough turned, and black.