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
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, %
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

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Mechanical properties at 20 °C

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

Brinell hardness number

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

Analogues

Germany
Germany
BGH 2379

Standards

Standard	Description
Standard	Description
GOST 5950-2000	GOST

Description of chemical elements

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