EN 10277-3 standard

W.NR.: 1.0762

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

44SMn28.pdf