Carbon Steel
C45 · 1.0503
Also known as 1045 / S45C / Ck45
Medium-carbon engineering steel for general machine parts.
C45 (material 1.0503, equivalent to AISI 1045) is an unalloyed medium-carbon engineering steel with a good balance of strength, wear resistance and machinability. Supplied hot-rolled, normalised or cold-drawn (bright), it is one of the most common general-purpose grades for shafts, bolts and machine components.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN 10083-2. Mill certificate governs.
| Element | % |
|---|---|
| C | 0.42 – 0.50 |
| Si | ≤ 0.40 |
| Mn | 0.50 – 0.80 |
| Cr | ≤ 0.40 |
| Mo | ≤ 0.10 |
| Ni | ≤ 0.40 |
| P | ≤ 0.045 |
| S | ≤ 0.045 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 6 – 250 mm
Typical applications.
- Shafts & axles
- Bolts & fasteners
- Gears
- General machine parts
FAQ.
What is C45?
C45 (material 1.0503, equivalent to AISI 1045) is an unalloyed medium-carbon engineering steel with a good balance of strength, wear resistance and machinability. Supplied hot-rolled, normalised or cold-drawn (bright), it is one of the most common general-purpose grades for shafts, bolts and machine components.
Is C45 the same as 1045?
Yes — C45 is the European (EN) designation, while 1045, S45C, Ck45 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 C45?
C45 corresponds to C45 (1.0503) (EN), 1045 (AISI / SAE), S45C (JIS), 45 (GB). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is C45 available?
C45 is supplied as Round bar, Flat bar, Square bar, Bright / cold-drawn bar, in Ø 6 – 250 mm.
What is C45 used for?
Typical applications include Shafts & axles, Bolts & fasteners, Gears, General machine parts.