3D-METAL.TECH -

JIS G4311 / G4312 Heat-Resistant Steel Guide: SUH Grade Families Explained

JIS G4311 and G4312 cover Japan's SUH heat-resistant steel series across four structural families: martensitic, ferritic, austenitic, and precipitation-hardening. Full grade overview with service temperature limits, ASTM equivalents, and application decision framework.

2026.06.12

steel

JIS G4804 Free-Cutting Steel Guide: All SUM Grades, Machinability, and Selection

JIS G4804 covers 15 free-cutting steel grades — SUM11 to SUM43. Full guide: S, P, and Pb additions explained, machinability by grade, applications, and regulatory status of Pb-containing grades.

2026.06.12

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 G3302 Galvanized Steel Sheet Grade Guide: SGCC to SGCE — Coating Weight, Grades, and Specifications

JIS G3302 covers hot-dip galvanized cold-rolled steel in five formability grades from SGCC to SGCE. Full guide to the Z-code coating weight system, surface treatment options, galvannealed (ZF) variant, and ASTM A653 / EN 10346 equivalents.

2026.06.10

steel

JIS G3141 Cold-Rolled Steel Sheet Grade Guide: SPCC, SPCD, SPCE, SPCF, SPCG

JIS G3141 covers five cold-rolled steel sheet grades from SPCC (general) to SPCG (super deep drawing IF steel). Full comparison of composition, elongation, r-value, and ASTM/EN equivalents — with application decision table.

2026.06.09

uncategorized

Galvanized vs Galvannealed vs Galvalume vs Pre-Painted: Which Coated Steel for Which Use

Four coated flat steel products — SGCC (galvanized), SGCC-ZF (galvannealed), SZACC (Galvalume), and CGCC (pre-painted) — protect steel through different mechanisms and suit different applications. Full comparison with corrosion life, cost, and application selection guide.

2026.06.09

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

SPCC vs SPHC: Cold-Rolled vs Hot-Rolled Steel Sheet — How to Choose

SPCC (cold-rolled, JIS G3141) and SPHC (hot-rolled, JIS G3131) cover different thickness ranges and deliver different surfaces, tolerances, and mechanical property guarantees. Full comparison with decision guide for stamping, welded frames, and laser-cut parts.

2026.06.08

steel

JIS FCD450 Ductile Iron: A536 Grade 65-45-12 Equivalent — Nodular Cast Iron for Crankshafts & Gears

FCD450 (JIS G5502) is Japan's A536 Grade 65-45-12 equivalent ductile iron — 450 MPa tensile, 10% elongation. Full guide: GJS-450-10 equivalent, all FCD grades, austempering to ADI, and when FCD outperforms FC gray iron.

2026.06.07

steel

JIS FC200 Cast Iron: A48 Class 30 Equivalent — Gray Cast Iron for Machine Bases & Engine Blocks

FC200 (JIS G5501) is Japan's standard gray cast iron — flake graphite, ≥200 MPa tensile strength. Full guide: GJL-200 equivalent, all FC grades, vibration damping, machinability, and when to choose gray iron over ductile iron.

2026.06.07

steel