Yes for practical purposes — JIS G4404 SKD61 and ASTM A681 H13 overlap in composition and use.

SKD61

Data verified

SKD61 is the JIS designation of the H13 hot work steel family — the grade name seen on Japanese, Korean and Taiwanese certificates for die casting and extrusion tooling.

Hardness43–52 HRC

DIN1.2344

AISIH13

JISSKD61

CategoryTool Steel

Chemical composition

Element	Content (%)
C	0.35–0.42
Si	0.80–1.20
Mn	≤0.50
Cr	4.80–5.50
Mo	1.00–1.50
V	0.80–1.15

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Delivery condition	Annealed
Working hardness	43–52 HRC
Density	7.80 g/cm³

Heat treatment

Harden 1000–1050 °C; temper 550–600 °C twice.

Equivalent grades

Standard	Designation
din	1.2344
aisi	H13
jis	SKD61
gb	4Cr5MoSiV1

Compare side by side: SKD61 vs H13 · SKD61 vs H11

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Die casting dies, extrusion dies, hot shear blades, forging inserts.

Processing: As H13. ESR grades preferred for large dies and polished cavities.

FAQ

SKD61 = H13?: Yes for practical purposes — JIS G4404 SKD61 and ASTM A681 H13 overlap in composition and use.

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Source: JIS G4404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.