20HGNM

For the manufacture of parts subjected to high vibration and dynamic loads.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %	Mo, %
GOST 4543-71	96.28–98	0.17–0.37	0.7–1.1	0.4–0.7	< 0.3	0.4–0.7	< 0.035	0.18–0.23	< 0.035	0.15–0.25

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$	Treatment
Alloy	GOST 4543-71				1180–1570	930	7	590	Tempering 860 ° C, oil, Holidays 150-180 ° C, air

Analogues

USA	Germany
K12147	1.6523 (21NiCrMo2)

Standards

Standard	Description
GOST 4543-71

Description of chemical elements

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

Description of mechanical properties

Parameter	Units of measurement	Description
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\sigma_{P}$$	$$MPa$$	Proportionality limit
$$\epsilon_L$$	%	Elongation at break (longitudinal)
$$KCU\cdot 10^{3}$$	$$\frac{J}{m^2}$$	Impact toughness