Steel Р9М4К6С (ЭП722)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Р9М4К6С |
| Designation GOST Latin |
P9M4K6C |
| Transliteration |
R9M4K6S |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП722 |
| Designation GOST Latin |
EP722 |
| Transliteration |
EhP722 |
| The chemical elements |
- |
Description
Р9М4К6С steel is used: for the manufacture of cutting tools of high productivity, designed for finishing of heat resistant alloys and alloyed structural steels and alloys, working in conditions of high heat cutting edge; parts of firearms.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-2394-78 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
V |
Mo |
W |
Co |
| TU 14-1-2394-78 |
1.05-1.13 |
≤0.03 |
≤0.03 |
≤0.4 |
3.5-4 |
0.75-1.2 |
≤0.4 |
The rest |
1.5-1.9 |
3.4-4 |
8-9.1 |
5.7-6.7 |
Fe is the basis.
Technological properties
| Name |
The value |
| Features of production |
Bars and stripes on the other 14-1-2394-78 are supplied in the annealed condition with hardness not more than 285 HB (indentation diameter - not less than 3.6 mm). To check the hardness after quenching and tempering, the samples are subjected to hardening with 1200-1220 °C. the samples were Then subjected to two or three times the release at a temperature of 560-580 °C with exposure for 1 hour (for every time). |
| Features of heat treatment |
To determine the depth bezoperatsionnogo layer M2 according to the method GOST 1763 samples subjected to heat treatment in the following mode: Annealing with 1200-1220 °C water (the temperature of the 1st bath 190-220 °C, 10 minutes exposure) + Vacation (temperature 2nd bath 580-600 °C, exposure time 10 minutes). |
| Redness |
The red hardness of steel should provide a hardness of at least HRC 58 after a four-hour tempering at a temperature of 630 °C. |
