Designation
| Name |
The value |
| Designation GOST Cyrillic |
38ХМ |
| Designation GOST Latin |
38XM |
| Transliteration |
38HM |
| By chemical elements |
38CrMo |
| Name |
The value |
| Designation GOST Cyrillic |
42ХМ |
| Designation GOST Latin |
42XM |
| Transliteration |
42HM |
| By chemical elements |
42CrMo |
Description
38KHM steel is used: for the manufacture of critical turbine parts and compressor rings for turbine generators, operating at temperatures up to 400 °C.
Note
Structural steel high-quality chrome-molybdenum.
The replacement of Mo by W the steel has a marked 38KHV.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
GOST 4543-71, GOST 14955-77, TU 14-1-2118-77, TU 14-1-4864-90, TU 14-1-4865-90, TU 14-1-4866-90, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 8319.0-75 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90, TU 14-133-180-94 |
| Processing of metals by pressure. Forgings |
В03 |
TU 3-896-78, TU 108.11.931-87 |
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Quenching in oil from 850 °C + vacation at 580 °C, air cooling |
| ≤25 |
885 |
980 |
11 |
45 |
690 |
| Forged billet rings for turbine generators of thermal power plants up to 500 MW I-VIII categories THAT 3-896-78 (samples tangential) |
| - |
294 |
491 |
16 |
30 |
294 |
| - |
392 |
589 |
16 |
30 |
491 |
| - |
491 |
687 |
16 |
30 |
392 |
| - |
589 |
765 |
16 |
35 |
491 |
| - |
687 |
834 |
14 |
35 |
491 |
| - |
785 |
932 |
13 |
35 |
392 |
| - |
883 |
1010 |
12 |
30 |
392 |
| - |
981 |
1079 |
11 |
30 |
294 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
