Material data sheet 1.8509

International Standards:
41CrAlMo7-10 / 41CrAlMo7 | AMS 6470H | BS EN41B,905M39 | AFNOR 40CAD612

Applications:
Nitriding steel for wear parts in general mechanical engineering and vehicle construction, with required high surface hardness.

Field of application:

- Gears

- Components for valves

- Mechanical engineering

- Hot steam fittings 350-500 °C

- Tools for hot forming

Characteristics:

Physical properties:

Density	7.57 g/cm³
Electrical resistance at 20°C (Ω mm2 /m)	0,19
Thermal conductivity at 20°C (W/m K)	42.6 W/m °C
Specific heat capacity at 20°C (J/kg K)	470

Mechanical properties:

Hardness HBW	248 HB (annealed)
0,2 % proof strength	625(remunerated)
Tensile strength max. (at H950 condition)	800-1000 N/mm² (tempered)
Elongation at break (longitudinal)	min. 15% (remunerated)
Notched bar impact energy (ISO-V) longitudinal	30 J/cm² (coated)

Processing:

Cold heading	n/a
Open-die and drop forging	yes

Heat treatment:

Forging	1.8509 is slowly cooled after hot forming at 1100°C–850°C.
Welding	41CrAlMo7-10 is not used in welded structures because it is very difficult to weld.
Annealing	650-700 °C
Stress relieving annealing
Hardening	Suitable for nitriding at 500-520°C, highest surface hardness attainable at thicknesses of 80-100 mm Tempering 880-920°C with quenching in oil
Starting

Chemical analysis:

1.8509	C	Si	Mn	P	S	Cr	Mo	Al
min.	0,38		0,4			1,5	0,2	0,8
max.	0,45	0,40	0,70	0,025	0,025	1,8	0,35	1,2

We're happy to answer your questions about 1.8509. Contact us now for more information.