martensitic

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.

SUH3 Steel: 10Cr-2Si Martensitic Heat-Resistant Steel for Diesel Exhaust Valves

SUH3 is a 10%Cr, 2%Si martensitic heat-resistant steel used in diesel and heavy-duty engine exhaust valves. Max service ~800°C. Covers composition, heat treatment (950–1050°C harden + 700–800°C temper), mechanical properties vs temperature, silicon's oxidation role, and comparison with SUH1, SUH4, and austenitic valve grades.