SNCM215

Alloy Steel

SNCM215

JIS G 4103 Ni-Cr-Mo steel SNCM215.

Chemical Composition (%)

C0.38
SI0.15
MN0.6
NI1.65
CR0.7
MO0.2
P0.035
S0.04

Mechanical Properties

Tensile:≥450 MPa;Yield:≥280 MPa;Elongation:≥20%

Chinese Standard

JIS G 4103

Equivalent Grades

JIS SNCM215 / AISI 43xx

Applications

Heavy forgings

Available Forms

Bar

Uses

Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈0.8%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.25%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈1.825%) 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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