6H4M2FS (DI55, 60H4M2FS)

Another designation EP788. The temperature of critical points of steel 6Х3МФС: Ac 1 = 760 — 790, Ac 3 (Ac m) = 950 — 975, Mn = 210 — 220. Hardness after annealing (GOST 5950−2000): HB 10 -1 = 241 MPa.

for punching and upsetting tools (stamps, puasonov, pneumatic chisels, etc.), rolling tools

Classification

Country Section Category
CIS, Russia, Ukraine Tool steel Alloy tool steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % V, % P, % C, % S, % Mo, %
GOST 5950-2000 89.74–92.38 0.7–1 0.15–0.45 3.8–4.4 < 0.3 < 0.4 0.4–0.6 < 0.03 0.57–0.65 < 0.03 2–2.4

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma_{P}$$, $$MPa$$ Treatment
Alloy 1800–2000 Hardening and tempering

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 5950-73 annealing 255

Analogues

Germany
BGH 2379

Standards

Standard Description
GOST 5950-2000 GOST

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma_{P}$$ $$MPa$$ Proportionality limit