Designation
| Name |
The value |
| Designation GOST Cyrillic |
25ХГНМА |
| Designation GOST Latin |
25XGHMA |
| Transliteration |
25HGNMA |
| By chemical elements |
25CrMnНMo |
| Name |
The value |
| Designation GOST Cyrillic |
25ХГНМ |
| Designation GOST Latin |
25XGHM |
| Transliteration |
25HGNM |
| By chemical elements |
25CrMnНMo |
Description
25ХГНМА steel is used: for the production of rental applied for manufacturing of parts of drilling bits, parts of excavators, special fasteners, shafts, axles, gear wheels and other critical parts of the mining and metallurgical and oil-processing equipment, requirements of increased strength.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
TU 14-1-1689-76, TU 14-1-2594-78 |
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
| Rolled steel. Quenching in oil from 850 °C + Vacation at 570 °C, cooling in water or oil |
|
≥685 |
≥780 |
≥12 |
≥40 |
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 |
Physical characteristics
| Temperature |
r, kg/m3 |
| 20 |
7800 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
Difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment. |
| Склонность к отпускной хрупкости |
Inclined. |
| The temperature of forging |
The beginning of 1200 °C, the end of the 800°C. the cross Sections up to 250 mm are cooled in air, 251-350 mm - in the pit. |
| Flock-sensitive sensitivity |
Sensitive. |
