Standards Guide
Common steel grade equivalents.
A practical summary of common AISI/SAE, EN and older DIN designations.
This table is for preliminary selection. Product standard, chemistry, mechanical properties, delivery condition and certificate must be checked for exact equivalence.
| Market name | Common equivalent | Group |
|---|---|---|
| 4140 | 42CrMo4 / 1.7225 | Engineering / Q&T steel |
| C45 / CK45 | C45E / 1.0503 / SAE 1045 | Carbon steel |
| 16MnCr5 | 1.7131 | Case-hardening steel |
| 20MnCr5 | 1.7147 / SAE 5120 (yakın kullanım) | Case-hardening steel |
| ST37 | S235 sınıfları | Structural steel |
| ST52 | S355 sınıfları | Structural steel |
Why is certificate verification necessary?
The same commercial name can cover different standards, tolerances, impact classes or heat-treatment conditions.
Information required in an order
- Grade and standard
- Production route
- Delivery condition
- Dimensions and tolerance
- Inspection requirements
- Origin and certificate requirements