EN 10277-4 Standard
W.NR.: 1.7149/20MnCrS5
Special Alloy Case-Hardening Steel
Heat analysis according to the EN 10277-4 standard
| C % | Si % | Mn % | P % | S % | Cr % | |
| DA | 0,17 | – | 1,10 | – | 0,020 | 1,00 |
| A | 0,22 | 0,40 | 1,40 | 0,025 | 0,040 | 1,30 |
According to the EN 10277-4 standard
| Thickness mm | Soft Annealed* + Peeled Rolled (+A +SH ) | Soft Annealed* + Cold Drawn |
| ( +A+C ) | ||
| Hardness Maximum Values HB | Hardness Maximum Values HB | |
| ≥5≤10 | – | 270 |
| >10≤16 | – | 260 |
| >16≤40 | 217 | 255 |
| >40≤63 | 217 | 250 |
| >63≤100 | 217 | 250 |
* Delivery condition: subjected to a softening treatment according to the maximum hardness prescription.
Weldability:
It is a MnCr alloy steel, easily hot machinable and weldable.
Hardenability:
It has a medium hardenability and therefore it can show good core features till thicknesses of about 40 mm.
Notes:
CORRESPONDENCE WITH OTHER STANDARDS (purely as an indication):
| UNI 7846 | EN 10084 | DIN 17210 | ISO 683-11 | AFNOR 35-551 |
| 20MnCr5 | 20MnCrS5 | 20MnCrS5 | 20MnCrS5 | 20MC5 |