Alloy Steel
42CrMo4 · 1.7225
Also known as 4140 / SCM440 / 708M40
Chromium-molybdenum engineering steel for high-stress shafts, gears and crankshafts.
42CrMo4 (material 1.7225, equivalent to AISI 4140) is a low-alloy chromium-molybdenum engineering steel valued for its high strength, toughness and good hardenability in the quenched-and-tempered condition. One of the most widely used grades for highly stressed machine and automotive components, available hot-rolled, cold-drawn (bright) and forged.
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 | 0.38 – 0.45 |
| Si | ≤ 0.40 |
| Mn | 0.60 – 0.90 |
| Cr | 0.90 – 1.20 |
| Mo | 0.15 – 0.30 |
| P | ≤ 0.025 |
| S | ≤ 0.035 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 8 – 800 mm
Typical applications.
- Crankshafts
- Axles & drive shafts
- Gears & pinions
- Hydraulic components
- High-stress machine parts
FAQ.
What is 42CrMo4?
42CrMo4 (material 1.7225, equivalent to AISI 4140) is a low-alloy chromium-molybdenum engineering steel valued for its high strength, toughness and good hardenability in the quenched-and-tempered condition. One of the most widely used grades for highly stressed machine and automotive components, available hot-rolled, cold-drawn (bright) and forged.
Is 42CrMo4 the same as 4140?
Yes — 42CrMo4 is the European (EN) designation, while 4140, SCM440, 708M40 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 42CrMo4?
42CrMo4 corresponds to 42CrMo4 (1.7225) (EN), 4140 (AISI / SAE), SCM440 (JIS), 42CrMo (GB), 708M40 (BS). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is 42CrMo4 available?
42CrMo4 is supplied as Round bar, Flat bar, Bright / cold-drawn bar, Forged, in Ø 8 – 800 mm.
What is 42CrMo4 used for?
Typical applications include Crankshafts, Axles & drive shafts, Gears & pinions, Hydraulic components, High-stress machine parts.