steel 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.