25G

After improvement — rivet-duty; after carburizing or cyanide — piston pins, friction discs, finger springs, cam rollers, bolts, nuts, screws, gears, worms and other parts with high surface hardness and wear resistance; without heat treatment — welded sub-frame, shoes, scarves, fittings, bushings.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 4543-71	97.36–98.91	0.17–0.37	0.7–1	< 0.3	< 0.3	< 0.3	< 0.035	0.22–0.3	< 0.035

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$	Treatment
Workpiece	GOST 4543-71	< 25			500	300	22	50	880	Tempering 880 ° C, the water, leave 560 ° C, air

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 4543-71	annealing	197

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K
723	820

Analogues

USA	Germany
1026	1.1155 (GS-Ck25)

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

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)
$$\psi$$	%	Reduction in cross section on fracture
$$KCU\cdot 10^{3}$$	$$\frac{J}{m^2}$$	Impact toughness

Description of temperatures of critical points

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