65Mn

Alloy Steel

65Mn

Spring wire steel. (GB/T 1222; equiv GB 65Mn / DIN 1.0614 / JIS SUP3). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.62
SI0.17
MN0.9
S0.035
P0.035

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa;Elong:≥8%;Hardness:≤269 HB

Chinese Standard

T 1222 65Mn

Equivalent Grades

GB 65Mn / DIN 1.0614 / JIS SUP3

Applications

弹簧钢丝钢。,"Bar

Available Forms

Wire"

Uses

High-carbon grade for rails, springs, cutting tools, wear plates and components demanding high hardness and wear resistance after heat treatment. Commonly supplied as bar, plate, sheet, tube and forging.

Heat Treatment

Austenitize at 760–820 °C and quench (oil/water) then temper at 150–400 °C for high hardness; spheroidize anneal (680–720 °C) improves machinability of the as-rolled bar.

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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