AISI H13 Hot-Work Tool Steel
AISI H13 (UNS T20813) — the standard die-casting / hot-shear grade, HRC 48–54, hot hardness to ~600 °C. Compare with H11 and H21.
AISI H13 (UNS T20813, DIN 1.2344, JIS SKD61) is the standard 5 % Cr hot-work tool steel — the most widely used die-casting and hot-shear grade. Hardened to HRC 48–54 with secondary hardening at 510–540 °C, it retains hot hardness up to ~600 °C and offers the toughness required for high-impact hot-work applications.
Standard composition: C 0.32–0.45 %, Cr 4.75–5.50 %, Mo 1.10–1.75 %, V 0.80–1.20 %, Mn 0.20–0.50 %, Si 0.80–1.25 %, balance Fe
Hardness: Annealed HB 192–229; hardened HRC 48–54
Heat treatment: Austenitise 1,000–1,050 °C, air or oil cool, double temper 550–620 °C
Properties: The standard hot-work tool steel. Excellent hot hardness up to ~ 600 °C. Tough enough for high-impact applications. Secondary hardening at 510–540 °C. The most widely used tool steel for die casting and hot shear.
Applications: Hot shear blades, die-casting dies and inserts, hot forging dies, extrusion tooling.
Cross-reference: ≈ JIS SKD61, DIN 1.2344, GB 4Cr5MoSiV1, BS BH13.
See also.
