5CrNiMo

Data verified

5CrNiMo is China’s standard hammer forging die steel (GB/T 1299), a Ni-Cr-Mo grade that through-hardens in very large die blocks while staying tough. It has served Chinese forge shops for decades as the default die-block material.

Hardness34–44 HRC (forging dies)

DIN1.2713 (55NiCrMoV6, close)

AISIL6 (family)

JISSKT4

CategoryTool Steel

Chemical composition

Element	Content (%)
C	0.50–0.60
Si	0.15–0.35
Mn	0.50–0.80
Cr	0.50–0.80
Ni	1.40–1.80
Mo	0.15–0.30

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

Properties

Delivery condition	Annealed or prehardened
Working hardness	34–44 HRC (forging dies)
Density	7.85 g/cm³
Toughness	Very high in large blocks

Heat treatment

Harden 840–870 °C oil; temper 460–600 °C to die hardness. Large blocks are usually supplied prehardened.

Equivalent grades

Standard	Designation
din	1.2713 (55NiCrMoV6, close)
aisi	L6 (family)
jis	SKT4
gb	5CrNiMo

Compare side by side: 5CrNiMo vs L6 · 5CrNiMo vs 5CrMnMo

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

Applications & Processing

Applications: Hammer and press forging die blocks, die holders, hot trimming dies, large hot-work inserts.

Processing: Supplied as big forged blocks, often prehardened; weld repair is routine. The V-bearing variant 5CrNiMoV upgrades hot wear for severe duty.

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Source: GB/T 1299 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.