steel 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.