1. Key Properties
AISI/SAE 4140 Hot Rolled + Peeled (HR+P) is a chromium-molybdenum alloy steel that combines excellent strength, toughness, and wear resistance. The HR+P process involves hot rolling followed by peeling, which enhances the surface finish, removing any surface imperfections and improving dimensional accuracy. This steel grade is widely used for applications that require high strength, impact resistance, and fatigue resistance, especially after heat treatment such as quenching and tempering.
2. Applications/Industries
Automotive (e.g., gears, crankshafts, axles)
Aerospace (e.g., shafts, structural components)
Industrial Machinery (e.g., spindles, shafts)
Power Transmission Components
Oil & Gas Equipment
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)