Alloy Steel
34CrNiMo6 · 1.6582
Also known as 4340 / SNCM439
High-strength Cr-Ni-Mo steel for heavily loaded shafts and structural parts.
34CrNiMo6 (material 1.6582, near AISI 4340) is a high-strength chromium-nickel-molybdenum engineering steel with excellent toughness and deep hardenability. It is used for the most heavily loaded shafts, connecting rods and structural components where high strength must be combined with toughness.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN 10083-3. Mill certificate governs.
| Element | % |
|---|---|
| C | 0.30 – 0.38 |
| Si | ≤ 0.40 |
| Mn | 0.50 – 0.80 |
| Cr | 1.30 – 1.70 |
| Mo | 0.15 – 0.30 |
| Ni | 1.30 – 1.70 |
| P | ≤ 0.025 |
| S | ≤ 0.035 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 16 – 600 mm
Typical applications.
- Heavily loaded shafts
- Connecting rods
- Aircraft & defence parts
- Gear shafts
FAQ.
What is 34CrNiMo6?
34CrNiMo6 (material 1.6582, near AISI 4340) is a high-strength chromium-nickel-molybdenum engineering steel with excellent toughness and deep hardenability. It is used for the most heavily loaded shafts, connecting rods and structural components where high strength must be combined with toughness.
Is 34CrNiMo6 the same as 4340?
Yes — 34CrNiMo6 is the European (EN) designation, while 4340, SNCM439 are the matching names used in other countries and standards (for example AISI/SAE in the USA, JIS in Japan, GB in China, former DIN in Germany). They are near equivalents and may differ slightly in chemistry; the mill certificate governs the exact specification.
What are the international equivalents of 34CrNiMo6?
34CrNiMo6 corresponds to 34CrNiMo6 (1.6582) (EN), 4337 / 4340 (near) (AISI / SAE), SNCM439 (JIS), 34CrNiMo6 (GB). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 34CrNiMo6 available?
34CrNiMo6 is supplied as Round bar, Forged, Bright / cold-drawn bar, in Ø 16 – 600 mm.
What is 34CrNiMo6 used for?
Typical applications include Heavily loaded shafts, Connecting rods, Aircraft & defence parts, Gear shafts.