Steel 25Х1М1ФА (Р2МА; 25KH1M1F)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
25Х1М1ФА |
| Designation GOST Latin |
25X1M1FA |
| Transliteration |
25H1M1FA |
| The chemical elements |
25Cr1Mo1V |
| Name |
The value |
| Designation GOST Cyrillic |
Р2МА |
| Designation GOST Latin |
P2MA |
| Transliteration |
R2MA |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
25Х1М1Ф |
| Designation GOST Latin |
25X1M1F |
| Transliteration |
25H1M1F |
| The chemical elements |
25Cr1Mo1V |
Description
25Х1М1ФА steel is used: for the manufacture of billets of shafts and one-piece rotors stationary and transport steam turbines, wheels and other parts operating at temperatures up to 540 °C.
Standards
| Name |
Code |
Standards |
| Metal forming. Forgings |
В03 |
TU 108-1029-81, ST ЦКБА 010-2004 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| TU 108-1029-81 |
0.21-0.29 |
≤0.022 |
≤0.025 |
0.3-0.6 |
1.5-1.8 |
≤0.37 |
≤0.4 |
The rest |
≤0.25 |
0.22-0.32 |
0.9-1.05 |
Fe is the basis.
According to TU 108-1029-81, the chemical composition is given for steel grade 25H1M1FA (P2MA). In the workpieces, deviations in the content of the elements indicated in the table are allowed: carbon ± 0.010%, silicon + 0.030%. For metal VDP, the deviation of manganese content +0.10% / - 0.15% is allowed. The deviation of the silicon content in the metal VDP and ESR is allowed within ± 0.050%. In the ESR steel, the sulfur content should not be more than 0.015%. The total content of sulfur and phosphorus should not be more than 0.040%.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample) |
| 490-667 |
≥618 |
≥16 |
≥40 |
≥390 |
| 490-667 |
≥618 |
≥13 |
≥35 |
≥390 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
| 20 |
216 |
7820 |
- |
233 |
- |
| 100 |
214 |
7800 |
406 |
283 |
109 |
| 200 |
210 |
7770 |
398 |
349 |
12 |
| 300 |
205 |
7740 |
39 |
428 |
127 |
| 400 |
197 |
7700 |
377 |
519 |
1365 |
| 500 |
186 |
7670 |
36 |
633 |
1372 |
| 600 |
171 |
7640 |
339 |
746 |
1382 |
| 700 |
- |
7600 |
31 |
862 |
14 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
