Designation
| Name |
The value |
| Designation GOST Cyrillic |
25Х2НМЛ |
| Designation GOST Latin |
25X2HML |
| Transliteration |
25H2NML |
| By chemical elements |
25Cr2НMo |
Description
25KH2NML steel is used: for the manufacture of casting parts heavy and transport engineering, working in conditions of low temperatures and elevated loading conditions; responsible welded-cast structures of large sections of career and draglines.
Note
Cold-resistant steel.
Standards
| Name |
Code |
Standards |
| Castings with special properties (iron and steel) |
В83 |
GOST 21357-87 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Mo |
| GOST 21357-87 |
0.22-0.3 |
≤0.02 |
≤0.02 |
0.5-0.8 |
1.6-1.9 |
0.2-0.4 |
0.6-0.9 |
Rest |
≤0.3 |
0.2-0.3 |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Annealing in air is 920 ° + vacation at 580-620 °C, air cooling |
| ≥650 |
≥750 |
≥12 |
≥25 |
≥600 |
| Casting section 140-250 mm. Annealing in air at 880 °C to + vacation at 560-570 °C, air cooling (named place of clippings sample) |
| ≥970 |
≥1170 |
≥9 |
≥38 |
≥700 |
| Casting. Quenching in water from 860-880 °C + vacation at 580-600 °C, air cooling (KCU-60) |
| ≥700 |
≥800 |
≥12 |
≥25 |
≥3 |
| Casting section 140-250 mm. Annealing in air at 880 °C to + vacation at 560-570 °C, air cooling (named place of clippings sample) |
| ≥815 |
≥915 |
≥7 |
≥21 |
≥650 |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
