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Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.
High-Strength Ultra-Fatigue-Resistant
300M Alloy Steel
- Yield Strength: 100,000 psi
- Hardness: Rockwell C25 (Hard)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C54
- Fabrication: Hot Rolled
- Specifications Met: ASTM A579
A modified version of 4340 alloy steel, this 300M alloy steel combines high yield strength with extreme resistance to cracking. It’s often used to create parts that require both, such as torsion bars and drive shafts. This alloy steel has been heat treated to relieve internal stresses, making it easier to machine. Additional heat treatment can be applied to harden the surface and make it more wear resistant. This alloy steel meets strict ASTM A579 standards for manufacturing and performance.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.