20HF (20HFA)

for medium-sized parts subjected to carburizing and hardening with low release (gears, piston pins, distribution rollers, plungers, copiers)

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Alloyed structural steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %
GOST 10702-78	96.8–98.43	< 0.2	0.5–0.8	0.8–1.1	< 0.3	< 0.3	0.1–0.2	< 0.035	0.17–0.23	< 0.035

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$
100	12
200	12.5
400	13
500	13.7

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
		annealing, hot rolling	170

Technological Properties

Flake Susceptibility	Propensity to temper brittleness
Flake Susceptibility	Propensity to temper brittleness
insensitive	loathsome

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K
Ac₁, K	Ac₃(Ac_m), K
768	840

Analogues

Germany	USA
Germany	USA
22CrV4	6120

Standards

Standard	Description
Standard	Description
GOST 10702-78

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

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K