EN 10277-3 standard

W.NR.: 1.0760

High machinability steel for direct hardening

heat analysis according to the EN 10277-3 standard

C % Si % Mn % P % S %
From 0,35 1,20 0,24
To 0,40 0,40 1,50 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≤10 550 da 700 a 960 6
>10≤16 500 da 660 a 930 6
>16≤40 da 166 a 216 da 560 a 730 420 da 610 a 900 7
>40≤63 da 166 a 216 da 560 a 730 400 da 600 a 840 7
>63≤100 da 163 a 207 da 550 a 700 350 da 580 a 820 8

* 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 EN 10087
 / /  38SMn28

38SMn28.pdf