EN8D Steel – Chemical Composition & Key Properties
EN8D (also known as 080M40 or C45) is a high-carbon, medium-tensile steel commonly specified across Indian engineering applications that demand higher core strength than standard EN8. Below you’ll find its BIS-aligned chemistry, equivalents and usage guidance.
Chemical Composition (per IS 1570-2 & BS 970)
| Element | Min % | Max % |
|---|---|---|
| Carbon (C) | 0.40 | 0.45 |
| Manganese (Mn) | 0.70 | 0.90 |
| Silicon (Si) | 0.10 | 0.40 |
| Phosphorus (P) | — | 0.05 |
| Sulphur (S) | — | 0.05 |
| Chromium (Cr) | — | 0.40 |
| Nickel (Ni) | — | 0.40 |
| Molybdenum (Mo) | — | 0.10 |
Equivalent International Grades
- ISI Designation: 45C8
- BS 970: 080M40
- DIN/EN: C45 (1.1191)
- JIS: S45C
Applications in Indian Industry
Due to its ability to achieve 700–800 MPa tensile strength after oil quench & temper, EN8D is preferred for:
- Transmission shafts & axles
- Gear blanks & pinions
- High-grade studs & bolts
- Automotive steering components
Stock Range Available → View Inventory
Ambhe Ferro maintains round bars from 23.5 mm to 80 mm and hex bars from 23.5 mm to 52.5 mm with mill test certificates (MTC) ready for download.
Need Mechanical Properties?
Visit our EN8D Mechanical Properties page for yield, tensile, hardness and Charpy values.
