alloy-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.

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

JIS SNCM439 Steel: AISI 4340 Equivalent — Ni-Cr-Mo Alloy Steel for Heavy-Section Parts

JIS SNCM439 is a Ni-Cr-Mo high-hardenability alloy steel nearest to AISI 4340 and EN 36CrNiMo4. Explore composition, mechanical properties, heat treatment, and selection vs. SCM440.

2026.06.02

Heat Treatment

SS400, S45C & SCM435: Steel Selection Guide for Mechanical Designers

SS400 (≈A36), S45C (≈1045), SCM435 (≈4135): learn how to choose the right JIS steel for your design. Includes chemical composition comparison, hardenability data, failure cases, and sourcing tips for engineers outside Japan.

2026.05.29

steel

SNCM625 Steel: International Equivalents, Properties & Heat Treatment Guide

SNCM625 equivalent grades (DIN 34CrNiMo6, AISI 4340), chemical composition, mechanical properties, and heat treatment for large-section shafts. Metric and imperial data included.

2026.05.25

steel

SNCM415 Steel: International Equivalents, Properties & Carburizing Guide

SNCM415 equivalent grades (AISI 4320, DIN 18CrNiMo7-6), chemical composition, carburized case and core properties, and heat treatment. Full metric and imperial data for engineers.

2026.05.25

steel

SNCM220 Steel: International Equivalents, Properties & Carburizing Guide

SNCM220 equivalent grades (AISI 8620, DIN 21NiCrMo2), chemical composition, carburized case and core properties, and heat treatment. Metric and imperial data for engineers.

2026.05.22

steel

SNC815 Steel: Equivalent Grades, Properties & Heat Treatment Guide

SNC815 (JIS G4102) high-Ni carburizing steel: equivalents (AISI 3310, DIN 14NiCr14), properties, heat treatment, and applications for large-section heavy-duty gears.

2026.05.21

steel

SNC415 Steel: Equivalent Grades, Properties & Heat Treatment Guide

SNC415 (JIS G4102) Ni-Cr carburizing steel: international equivalents (AISI 3415, DIN 14NiCr10), chemical composition, mechanical properties, and heat treatment applications.

2026.05.20

steel

SNB7 vs ASTM A193 B7: Equivalent Grades, Properties & Key Differences

SNB7 (JIS G4107) vs ASTM A193 B7: composition equivalents, mechanical properties, heat treatment differences, and applications for high-pressure flange bolting.

2026.05.19

steel