Designation
| Name |
The value |
| Designation GOST Cyrillic |
25ХГТ |
| Designation GOST Latin |
25XGT |
| Transliteration |
25HGT |
| By chemical elements |
25CrMnTi |
Description
25KHGT steel is used: for the manufacture of loaded gear wheels and other parts, the hardness more HRCэ59.
Note
Structural steel quality chromatorgraphy.
Standards
| Name |
Code |
Standards |
| Sheets and strips |
В23 |
GOST 103-2006 |
| Bars and shapes |
В32 |
GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-1-707-73, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 4543-71 |
0.22-0.29 |
≤0.035 |
≤0.035 |
0.8-1.1 |
1-1.3 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
≤0.05 |
0.03-0.09 |
≤0.15 |
≤0.2 |
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HRC |
| Rolled steel. Normalization at 880-950 °C, air cooling + Quenching in oil from 850 °C + Vacation at 200°C, cooling in oil, water or air |
|
≥980 |
≥1270 |
≥10 |
≥50 |
≥690 |
- |
| Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 190-210 °C, air cooling |
|
≥1100 |
≥1500 |
≥9 |
- |
≥589 |
57-63 |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Weldability |
RDS, CCC; requires subsequent heat treatment. |
| Склонность к отпускной хрупкости |
Inclined. |
| The temperature of forging |
Beginning - 1220 °C, the end - of 800 °C. |
| Flock-sensitive sensitivity |
Sensitive. |
