4140 (AMS6349)

We stock 4140 steel bars, a deep hardening steel that is tough and fatigue resistant.

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4140 alloy finds use in components requiring high hardness, toughness, and fatigue resistance. As a high-tensile steel product, the material finds use in applications for industries including aerospace, oil & gas and automotive. Nitriding of the alloy is possible, resulting in improved fatigue and wear-resistant characteristics.

Fatigue Strength

Alloy 4140 provides high fatigue strength making the product suitable for critically stressed components at normal and elevated temperatures. Good overall strength and impact toughness are also performance benefits. Overall machinability of the alloy is good in the annealed condition. Uniform hardness and high strength are achieved due to the introduction of molybdenum, while chromium provides good hardness characteristics. Alloy 4140 also offers good ductility.

Stock Availability

We stock 4140 steel bars in a wide range of sizes and conditions (including annealed, normalised, hardened and tempered conditions).

Product Features:

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