Construction alloy steel - chromium-molybdenum for work at higher temperatures, 20HM PN-75/H-84024
| Steel grade | Standard |
Chemical composition (%) |
|||||||||
| C | Mn | Si | P | S | Cu | Cr | Ni | Mo | other |
||
| 20HM | PN | 0,190,26 |
0,500,80 | 0,150,35 | max 0,035 | max 0,035 | - | 0,901,20 | max 0,60 | 0,40 0,50 | Al  max 0,020 |
| 20HM20KHM20ChM20XM |
GOST | 0,150,25 | 0,400,70 | 0,170,37 | max 0,035 | max 0,035 | max 0,30 | 0,801,10 | max 0,30 | 0,15 0,25 | - |
| 25CrMo4
25 CrMo 4 1.7218 |
AFNOR
DIN W.nr |
0,220,29 | 0,600,90 | max0,40 | max 0,035 | max 0,035 | - | 0,90 1,20 | - | 0,15 0,30 | - |
| 24 CrMo 524CrMo5 1.7258 |
DIN W.nr |
0,200,28 | 0,500,80 | max0,40 | max 0,035 | max 0,035 | - | 0,90 1,20 | max 0,60 | 0,200,35 | - |
| 25HMPN-72/H-84030
25HMAPN-72/H-84030 |
PN | 0,220,29 | 0,400,70 | 0,170,37 | max 0,035
max 0,030 |
max 0,035
max 0,030 |
max 0,30 | 0,801,10 | max 0,30 | 0,15 0,25 | stal konstrukcyjna stopowa do ulepszania cieplnego |
Steel used for turbine rotors with a diameter of up to fi 300, axles, shafts and other parts of steam turbines that
work at the temperatures up to 550 o C.
20HM, 25HM, 25HMA grades is offered as rolled and forged rods.
15HM
20HM - ( 25HM )
10H2M
13HMF
21HMF
26H2MF
30H2MF
34HN3M
