300M Alloy Steel Round Bars (Modified 4340)

300M Alloy Steel Round Bars (Modified 4340)

300M is a "Modified 4340," with the addition of vanadium and a higher silicon content, it offers a combination of toughness and ductility at high-strength levels. 300M is a deep hardening steel with excellent torque properties, high fatigue and creep characteristics, and maintains its strength at moderately high temperatures. Meets MIL-S-8844, and others.

Stocked in 11-13 foot random lengths; cut pieces available. Other sizes may be available on request.

Diameter Weight / Foot (lbs) SKU Add to Quote
0.500
0.6682
6 300B50
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0.625
1.044
6 300B62
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0.875
2.046
6 300B875
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PropertyUp to 100 Sq inOver 100-144 sq in
Tensile Strength (psi)280,000 min280,000 min
Yield Point (psi)230,000 min230,000 min
Reduction of Area (%)30 min25 min

Note: The Typical Mechanical Properties listed have been compiled from a variety of sources. Information is deemed reliable, but not guaranteed. Data is provided for information only, NOT FOR DESIGN PURPOSES.