hardenability

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.

2026.06.10

steel

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.

2026.06.08

steel

S45C Steel Explained: Properties, Heat Treatment, and Practical Selection Guide

S45C steel (JIS G4051): chemical composition, mechanical properties, heat treatment, and practical guide to choosing between S45C, 1045, C45, and SCM440.（

2026.04.27

steel