heat-treatment

JIS SUS420J2 Steel: AISI 420 Equivalent — High-Carbon Martensitic for Blades & Molds

SUS420J2 (JIS G4303) is Japan's high-carbon martensitic stainless — hardenable to 50–56HRC. AISI 420 / 1.4028 equivalent. Properties, heat treatment, and blade/mold applications guide.

2026.06.18

stainless steel

JIS SUS410 Steel: AISI 410 Equivalent — Hardenable Martensitic Stainless for Valves & Cutlery

SUS410 (JIS G4303) is Japan's standard hardenable martensitic stainless — 12% Cr, heat-treatable to HRC 35–45. AISI 410 / 1.4006 equivalent. Properties, heat treatment, and applications.

2026.06.17

stainless steel

JIS SUS630 Steel: AISI 630 / 17-4PH Equivalent — Precipitation-Hardening Stainless

SUS630 (JIS G4303) is Japan's 17-4PH precipitation-hardening stainless. Full guide: condition H900–H1150, 930–1310 MPa range, AISI 630 equivalent, and aerospace/medical applications.

2026.06.16

stainless steel

JIS SKS3 Steel: O1 Equivalent — Oil-Hardening Cold-Work Tool Steel for Short-Run Dies

SKS3 (JIS G4404) is Japan's O1-equivalent oil-hardening tool steel — simpler heat treatment than SKD11 with better toughness. Full guide: 1.2510 equivalent, heat treatment, and when SKS3 outperforms SKD11 for cold-work tooling.

2026.06.15

steel

JIS SKH55 Steel: M35 Cobalt HSS — Red Hardness for Difficult-to-Cut Materials

SKH55 (JIS G4403) is Japan's M35-equivalent cobalt HSS — 5% Co raises red hardness beyond standard M2. Full guide: 1.3243 equivalent, heat treatment, cutting tool applications for stainless, titanium, and Ni alloys.

2026.06.15

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

DC53 Tool Steel: Modified D2 with Secondary Hardening — High Toughness Cold-Work Die Steel

DC53 is a modified D2-type cold-work die steel with 8% Cr and secondary hardening at 520°C — delivers SKD11-level wear resistance at ~2× toughness. Full guide: composition, heat treatment, EDM performance, and when DC53 outperforms SKD11.

2026.06.04

steel

Annealing Types Explained: Full, Process, Spheroidize, Stress-Relief, and Normalizing

Five annealing treatments — full, process, spheroidize, stress-relief, and normalizing — serve different goals at different temperatures. Complete selection guide with temperature ranges, microstructure effects, and application decision tree.

2026.06.03

Heat Treatment

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

Carburizing vs. Induction Hardening: Which Surface Treatment to Choose

Compare carburizing and induction hardening for surface-hardened steel parts. Understand case depth, suitable materials, cost, and when to choose each process.

2026.06.02

Heat Treatment