PMalloy 21 - Wear-resistant Fe-based alloy
PMalloy 21 combines high wear resistance with high ductility. The unique combination of properties gives the possibility to carry out surfacing without preheating.
The service life of screw conveyors deposited using this alloy is 3–5 times higher than that of nitrated screws
Properties:
1. Chemical composition:
2.2% C; 18% Cr; 3% Ni; 2% Mo; 7% V; 1% Si; 1% Mn; Fe – balance
2. Microstructure of the deposited layer
The structure of the deposited metal consists of solid solution based on iron, carbide eutectic and excess vanadium carbides up to 16%.
3. Durability
Resistance of PMalloy 21 against abrasive wear compared to other surfacing alloys shown in fig. 2.
The chemical compositions of these alloys are shown in the table.
|
# of alloy
|
chemical composition
|
Hardness,
HRC
|
||||||||
|
C
|
Si
|
Mn
|
Cr
|
B
|
W
|
Ni
|
Co
|
Fe
|
||
|
1
|
0,7
|
3,9
|
-
|
15,8
|
3,2
|
-
|
balance
|
-
|
<=3
|
58
|
|
2
|
1,1
|
2,1 |
-
|
28,1
|
-
|
4,4
|
balance
|
-
|
42
|
|
|
3
|
2,7
|
2,9
|
2,7
|
28,6
|
-
|
-
|
4,3
|
-
|
balance
|
46
|
4. The influence of tempering temperature
The sample is kept for 1 hour and cooled in air.
The characteristics of the deposited material depend
from the tempering temperature is shown in fig. 3 and 4.
