Ni-Cr-Mo

JIS G4103 Ni-Cr-Mo Steel Guide: SNCM Grade Comparison from SNCM220 to SNCM815

JIS G4103 covers 11 Ni-Cr-Mo structural steel grades — SNCM220 to SNCM815. Full guide: composition table, Ni content vs section size selection, carburizing vs through-hardening grades, and ASTM equivalents.

JIS SNCM240 Steel: Ni-Cr-Mo Alloy Steel for Medium-Section Shafts and Gears

SNCM240 (JIS G4103) is a Ni-Cr-Mo alloy structural steel — Ni addition over SCM440 improves toughness and hardenability for 30–60 mm sections. Full guide: composition, Q&T heat treatment, and when SNCM240 fills the gap between SCM440 and SNCM439.