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 values for a reference section and heat-treatment condition. Actual properties vary with dimension and treatment, and are confirmed on the mill certificate.
Available forms.
Size: Ø 6 – 250 mm · flats, plates & sheet to specification
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 and 1045, S45C, Ck45 are matching designations for the same steel across different standards (EN, AISI/SAE, JIS, GB, former DIN). They are near equivalents and may differ slightly in chemistry, so 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 (bar diameter; flats, plates and sheet are quoted to specification).
What is C45 used for?
Typical applications include Shafts & axles, Bolts & fasteners, Gears, General machine parts.