EN 10277-3 Standard
W.NR.: 1.0762/44SMn28
High Machinability Steel For Direct Hardening
Heat analysis according to the EN 10277-3 standard
| C % | Si % | Mn % | P % | S % | |
| From | 0,40 | – | 1,30 | – | 0,24 |
| To | 0,48 | 0,40 | 1,70 | 0,06 | 0,33 |
According to the EN 10277-3 standard
| Thickness mm | Rolled + Peeled Rolled ( +SH ) | Cold Drawn ( +C ) | |||
| Hardness HB | Rm (MPa) | Rp0,2 minimum | Rm (MPa) | A5 % | |
| (MPa) | minimum | ||||
| ≥5≤10 | 600 | da 760 a 1030 | 5 | ||
| >10≤16 | 530 | da 710 a 980 | 5 | ||
| >16≤40 | da 187 a 242 | da 630 a 820 | 460 | da 660 a 900 | 6 |
| >40≤63 | da 184 a 235 | da 620 a 790 | 430 | da 650 a 870 | 7 |
| >63≤100 | da 181 a 231 | da 610 a 780 | 390 | da 630 a 840 | 7 |
* Delivery condition: as rolled.
Machinability:
This steel grade generally shows a quite good machinability on machine tools; machinability decreases with the increase of carbon, silicon and manganese content.
Weldability:
Due to the high sulphur and phophorus content free-cutting steels for direct hardening are not recommended for welding.
Notes:
CORRESPONDENCE WITH OTHER STANDARDS (purely as an indication):
| UNI 4838 | AFNOR 35-562 | ISO 683-9 | EN 10087 |
| CF 44 SMn 28 | 45 MF 6.3 | 44 SMn 28 | 44SMn28 |