1.2365 or H13 for an extrusion die?

For aluminium, H13 is the standard. For brass/copper extrusion, where die temperatures run much higher, 1.2365’s extra molybdenum holds hardness that H13 would temper away.

Grades · Tool Steel · 1.2365 / 32CrMoV12-28

1.2365 / 32CrMoV12-28

Data verified

1.2365 is the high-molybdenum hot work steel of the H10 family: nearly 3% Mo buys outstanding tempering resistance and hot strength for tools that stay hot for a long time, such as brass extrusion and copper alloy die casting tooling. It trades a little toughness for that hot hardness.

Hardness44–52 HRC

DIN1.2365

AISIH10 (close)

JISSKD7 (near)

CategoryTool Steel

Chemical composition

Element	Content (%)
C	0.28–0.35
Si	0.10–0.40
Mn	0.15–0.45
P	≤0.030
S	≤0.030
Cr	2.70–3.20
Mo	2.60–3.00
V	0.40–0.70

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

Properties

Delivery condition	Annealed
Working hardness	44–52 HRC
Density	7.85 g/cm³
Hot hardness	Very good — high-Mo hot work grade

Heat treatment

Anneal 800–850 °C; harden 1020–1080 °C oil/air; double/triple temper 550–620 °C to working hardness.

Equivalent grades

Standard	Designation
din	1.2365
aisi	H10 (close)
jis	SKD7 (near)
gb	3Cr3Mo3V (near)

Compare side by side: 1.2365 / 32CrMoV12-28 vs H10 · 1.2365 / 32CrMoV12-28 vs H13 · 1.2365 / 32CrMoV12-28 vs 1.2367 / X38CrMoV5-3

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

Applications & Processing

Applications: Brass and copper extrusion dies, die casting dies for copper alloys, hot press tooling, extrusion press stems and liners.

Processing: Use ESR quality for pressure-tight or polished dies; preheat tools before service and avoid quenching a hot die in water — thermal shock is its main killer.

FAQ

1.2365 or H13 for an extrusion die?: For aluminium, H13 is the standard. For brass/copper extrusion, where die temperatures run much higher, 1.2365’s extra molybdenum holds hardness that H13 would temper away.

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Source: EN ISO 4957 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.