1340

Alloy Steel

1340

Mn quench & temper steel. (AISI/SAE; equiv GB 30Mn2). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.28
MN1.3

Mechanical Properties

Tensile:≥785 MPa;Yield:≥635 MPa

Equivalent Grades

SAE 1340 / GB 30Mn2

Applications

锰调质钢。,"Bar

Available Forms

Forging"

Uses

Medium-carbon grade for machine parts such as gears, crankshafts, axles, connecting rods, spindles and forgings that need a balance of strength, toughness and machinability. Commonly supplied as bar, plate, sheet, tube and forging.

Heat Treatment

Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

Precautions

Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

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