4H3VMF (EI2, 40H3VMF)

Another designation 3I2. Temperature of critical points: Ac ₁ = 800, Ac ₃ (Ac _m) = 850, Ar ₃ (Arc _m) = 760, Ar ₁ = 730, Mn = 230. Hardness after annealing (GOST 5950−2000): HB 10 ^-1 = 241 MPa .

for small hammer punches, hammer and pressing inserts (thickness or diameter of 300 to 400 mm), the tool gorizontalnokovochnyh cars during hot deformation and heat-resistant structural steels; tools for high-speed punching machine structural steels

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
GOST 5950-2000	91.26–94.3	0.6–0.9	0.3–0.6	2.8–3.5	< 0.3	< 0.4	0.6–0.9	< 0.03	0.4–0.48	< 0.03	0.4–0.6	0.6–1

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Metal rolling		10			1720	1520	560	Hardening of 1040-1060 ° C, the oil, leave 560-580 ° C, 530-570 ° C and Holidays

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 5950-73	annealing	241

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
800	850	760	730	230

Analogues

USA
USA
H10
T20810

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
W	%	Tungsten

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₃(Arc_m)	K
Ar₁	K
Mn	K