Designation
| Name |
The value |
| Designation GOST Cyrillic |
80Х20НС |
| Designation GOST Latin |
80X20HC |
| Transliteration |
80H20NS |
| By chemical elements |
80Cr20НС |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП992 |
| Designation GOST Latin |
EP992 |
| Transliteration |
EhP992 |
| By chemical elements |
- |
Description
80Х20НС steel is used: for the production of bars with special surface finish that is applied in the arms industry; exhaust valves of internal combustion engines by method of hot upsetting.
Note
Steel martensitic class.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
TU 14-1-1367-75, TU 14-1-840-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| TU 14-1-1367-75 |
0.7-0.8 |
≤0.03 |
≤0.035 |
0.4-0.7 |
19-21 |
1.25-1.75 |
1-2 |
Rest |
≤0.3 |
| TU 14-1-840-74 |
0.7-0.8 |
≤0.03 |
≤0.035 |
0.4-0.7 |
19-21 |
1.25-1.75 |
1-2 |
Rest |
- |
Fe is the basis.
According to TU 14-1-840-74, minor deviations from the norms of chemical composition are allowed in agreement with the consumer.
Technological properties
| Name |
The value |
| Macrostructure and pollution |
Decarbonizing supply ground rods on the other 14-1-840-74 not allowed. |
| Particularities of production of goods |
On the other 14-1-840-74 ground bars are supplied in the annealed condition with hardness not more than 302 (indentation diameter not less than 3.5 mm). As the surface of steel shall meet the requirements of GOST 14955 group D. |
| Machinability |
Difficult to machine steel. |
