45ХН3А

Alloy Steel

45ХН3А

GOST (Russia) steel grade 45ХН3А

Chemical Composition (%)

C0.43
SI0.17
MN0.4
CR0.5
P0.04
S0.04

Applications

Russian state standard (GOST) steel grade.

Available Forms

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

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈1.25%) 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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