709M40 Standards | High Tensile Alloy Steel | Harris (Steels) Limited
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709M40 Standards / Specification

Product category:

  • Round Bar

Product standards:

  • PD 970

Description:

709M40 is a high tensile alloy steel, usually supplied in the heat treated T condition, although several heat treatments are available with specification limitations on size. The steel exhibits good shock and wear resisting properties. Main uses include gears, bolts and studs, shafts spindles and forgings. The material is best machined with carbide tooling.

Chemical Analysis – Maximum values:

CSiMnPSCrMo

0.36/0.44

0.70/100

0.035

0.035

0.90/1.20

0.20/0.35

Mechanical values are given for the hot rolled (U) condition.

Refer to specific applicable standards for full specifications.

Mechanical Analysis – Minimum values:

Yield strength

Size

Mpa

> 6 ≤ 63

755

Tensile strength

Size

Mpa

> 6 ≤ 63

925/1075

% ElongationImpact energy JoulesHBW hardness

12

42

269/331