Grades · Alloy & Engineering Steel · 30CrNiMo8

30CrNiMo8

Data verified

30CrNiMo8 is a high-hardenability EN Q&T steel (1.6580) with about 2% each of chromium and nickel. It is specified for large, highly stressed parts — rotor shafts, aircraft components and heavy fasteners — where 42CrMo4 runs out of section capability.

Hardness34–44 HRC typical

DIN1.6580 (30CrNiMo8)

CategoryAlloy & Engineering Steel

Chemical composition

Element	Content (%)
C	0.26–0.34
Si	≤0.40
Mn	0.50–0.80
P	≤0.025
S	≤0.035
Cr	1.80–2.20
Ni	1.80–2.20
Mo	0.30–0.50

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

Properties

Hardness (Q&T)	34–44 HRC typical
Tensile strength	1100–1400 MPa (Q&T, EN 10083 section bands)
Density	7.85 g/cm³

Heat treatment

Quench 840–870 °C oil; temper 520–640 °C; deep hardening in large sections.

Equivalent grades

Standard	Designation
din	1.6580 (30CrNiMo8)

Compare side by side: 30CrNiMo8 vs 34CrNiMo6 · 30CrNiMo8 vs 4340

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

Applications & Processing

Applications: Large shafts, aircraft parts, heavy bolts and studs, plastic mold plates (large, high-strength).

Processing: Machines annealed; welding only with strict preheat and PWHT; often supplied Q&T to EN 10083 bands.

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Source: EN 10083-3 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.