1. Key Properties
AISI/SAE 4140 Forged + Hot Rolled (F+HR) is a versatile chromium-molybdenum alloy steel that combines the benefits of both forging and hot rolling processes. The forging process improves its mechanical properties by enhancing strength and toughness, while the hot rolling process provides good workability, surface finish, and dimensional accuracy. This dual-process steel is highly durable, offering excellent hardenability, wear resistance, and fatigue strength, making it suitable for demanding applications that require both high-performance and reliability under extreme conditions.
2. Applications/Industries
Automotive (e.g., gears, axles, shafts, crankshafts)
Aerospace (e.g., structural components, landing gears)
Industrial Machinery (e.g., spindles, shafts, heavy-duty equipment)
Oil & Gas Equipment (e.g., pumps, drilling components)
Power Transmission Components (e.g., couplings, gears)
Heavy Equipment
3. Certifications/Standards
Meets ASTM A29 standards
Meets SAE 4140 specifications
ISO 9001 certified
4. Chemical Composition
Carbon (C): 0.38–0.43%
Manganese (Mn): 0.60–0.90%
Chromium (Cr): 0.80–1.10%
Molybdenum (Mo): 0.15–0.25%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.04%
5. Technical Specifications
Yield Strength: 950–1100 MPa (depending on heat treatment)
Tensile Strength: 1100–1300 MPa
Hardness: 250–300 HB (Brinell Hardness)