Daido DC53 Refined Cold-Work Tool Steel
Daido DC53 — D2 refinement with 2× toughness, HRC 60–62, better grindability. Compare with D2 and SKD11 for high-precision slitter blades.
Daido DC53 is a Japanese refinement of AISI D2 (UNS T30402 equivalent) with reduced Cr and elevated Mo + V. Compared to standard D2, it claims roughly double the toughness at the same HRC 60–62 hardness, plus better grindability. Used in high-precision slitter blades, fineblanking tools and cold-work dies where D2 wear life is required but D2 grindability is the bottleneck.
Standard composition: C 0.90–1.00 %, Cr 7.50–8.50 %, Mo 1.80–2.20 %, V 0.20–0.50 %, Mn 0.20–0.50 %, Si 0.80–1.20 %, balance Fe
Hardness: Annealed HB 220–250; hardened HRC 60–62
Heat treatment: Austenitise 1,030–1,050 °C, gas or oil cool, double temper 520–540 °C
Properties: A proprietary Daido refinement of SKD11 with finer carbides, higher toughness (~ 1.5–2× SKD11 at the same hardness), and better machinability. Often the right answer for chipping-prone thin blades where SKD11 chips.
Applications: Precision thin slitter blades, shear blades on thick plate, crusher blades, granulator bed knives, plastic moulds.
Cross-reference: Daido proprietary; ≈ SKD11 chemistry with refined heat treatment and cleaner raw stock.
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