Designation
| Name |
The value |
| Designation GOST Cyrillic |
25ХГМНТБА |
| Designation GOST Latin |
25XGMHTBA |
| Transliteration |
25HGMNTBA |
| By chemical elements |
25CrMnMoНTiNb |
| Name |
The value |
| Designation GOST Cyrillic |
25ХГ2МНТБА |
| Designation GOST Latin |
25XG2MHTBA |
| Transliteration |
25HG2MNTBA |
| By chemical elements |
25CrMn2MoНTiNb |
Description
25ХГМНТБА steel is used: for the production of hot-rolled steel 52−110 mm. in diameter, used in the manufacture of electro-welded anchor chains III and IIIA categories of strength.
Note
High quality structural steel.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В22 |
GOST 2590-2006 |
| Bars and shapes |
В32 |
TU 14-1-3050-80 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Ti |
Mo |
Nb |
| TU 14-1-3050-80 |
0.23-0.29 |
≤0.025 |
≤0.025 |
0.8-1.4 |
0.5-0.8 |
0.2-0.45 |
0.5-0.8 |
Rest |
0.3 |
0.01-0.04 |
0.15-0.25 |
0.02-0.05 |
Fe is the basis.
According to TU 14-1-3050-80 the chemical stostav is given for steel 25HGMNTBA. At the request of the consumer, a rolling stock for chains of category IIIa made of steel grade 25ХГ2МНТБА is manufactured. In the steel grade 25HG2MNTBA content of Mn = 1.20-1.70%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Bars of g/K for circuits category III strength. Normalization of 950-980 °C, quenching in oil or water from 880-900 °C + vacation at 610-630 °C, air cooling |
|
539 |
686 |
17 |
40 |
588 |
| Bars of g/K for circuits as IIIA category of strength. Normalization 950-980 °C + quenching in oil or water from 880-900 °C + vacation at 600-640 °C, air cooling |
|
588 |
735 |
17 |
40 |
588 |
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 |
