Steel Р9М4К6С (ЭП722)

Designation

Name The value
Designation GOST Cyrillic Р9М4К6С
Designation GOST Latin P9M4K6C
Transliteration R9M4K6S
By chemical elements -
Name The value
Designation GOST Cyrillic ЭП722
Designation GOST Latin EP722
Transliteration EhP722
By 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
Bars and shapes 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 Rest 1.5-1.9 3.4-4 8-9.1 5.7-6.7
Fe is the basis.

Technological properties

Name The value
Particularities of production of goods 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).
Red hardness 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.