50XH

Alloy Steel

50XH

Ni-Cr quench & temper steel. (GOST 4543; equiv GB 40CrNi / DIN 40NiCr6). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.37
NI1
CR0.45

Mechanical Properties

Tensile:≥980 MPa;Yield:≥785 MPa

Chinese Standard

GOST 4543 50XH

Equivalent Grades

GB 40CrNi / DIN 40NiCr6

Applications

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Available Forms

Forging"

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.6%) improves hardenability, wear and corrosion resistance. Nickel (≈1.2%) increases toughness and impact strength at low temperature. 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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