1.8550 is CrAlNiMo-alloyed nitriding steel with a surface hardness after nitriding of minimum 950HV.
1.8550 (Ni50)
Description
APPLICATION AREAS
APPLICATION AREAS
Barrels and screws for injection moulding machines,
plungers, piston rods, parts for general engineering.
Technical Details
Technical Details
Chemical composition
Code: 1.8550, Nİ50, 34CrAlNi7
Carbon |
Chromium |
Molybdenum |
Nickel |
Aluminum |
C |
Cr |
Mo |
Ni |
Al |
0,34 |
1,70 |
0,20 |
1,00 |
1,00 |
Heat treatment
Temperature |
Cooling |
Hardness |
|
Soft annealing |
650 – 700°C |
furnace |
|
Normalizing |
860 – 900°C |
furnace |
|
Hardening |
870 – 930°C |
oil, pressure gas (N2), air or hot bath 500 – 550°C |
See Tempering Diagram |
Mechanical Properties
Hardness |
27 – 33 |
HRC |
Tensile strength |
800 – 1100 |
N/mm2 |
Yield strength |
600 – 680 |
kN/mm2 |
ElongationL=5D |
10 – 13 |
% |
Toughness |
30 – 35 |
CVN (J) |
Physical Properties
Coefficient of thermal expansion |
12,1 – 13,7 |
1/K * 10-6 |
Thermal conductivity (20°C)
|
33,7 |
W/mK |
Density |
7,80 |
g/cm3 |
