35MnB

Alloy Steel

35MnB

Chinese GB steel grade 35MnB

Chemical Composition (%)

C0.33
SI0.17
MN1
CR0.3
TI0.04
B0.0005
P0.035
S0.035

Applications

Chinese national standard (GB) steel grade per GB/T specification.

Available Forms

Bar, plate, sheet, tube, forgings, strip, wire

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.45%) improves hardenability, wear and corrosion resistance. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.

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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