65G

Springs, springs, thrust washers, brake bands, friction discs, gears, flanges, bearing housings, clamping and feed collets and other parts, which are subject to increased wear resistance, and parts that work without shock loads.

Classification

Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Spring-spring structural steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 14959-79	96.96–98.31	0.17–0.37	0.9–1.2	< 0.25	< 0.2	< 0.25	< 0.035	0.62–0.7	< 0.035

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$
20	2.15		37	7850
100	2.13	11.8	36	7830	0.49
200	2.07	12.6	35	7800	0.51
300	2	13.2	34		0.525
400	1.8	13.6	32	7730	0.56
500	1.7	14.1	31		0.575
600	1.54	14.6	30		0.59
700	1.36	14.5	29		0.625
800	1.28	11.8	28		0.705

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\psi$$, %	d5, %	Treatment
Hire	GOST 14959-79				980	785	30	8	Hardening and tempering
The plates	GOST 1577-93			fat	740			12
The tape is hardcore.	GOST 2283-79			cold-work	740–1180
The tape is annealed.	GOST 2283-79			annealing	640–740			10–15

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 14959-79	raw	285
Hire	GOST 14959-79	heat-treated	241
The plates	GOST 1577-93	annealing, fat	229

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Not applicable for welded structures	insensitive	inclined

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
721	745	720	670	270

Analogues

USA	Germany
G15660	1.1260 (66Mn4)

Standards

Standard	Description
GOST 14959-79

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 physical characteristics

Parameter	Units of measurement	Description
$$E\cdot 10^{9}$$	$$MPa$$	Elastic modulus
$$\alpha\cdot 10^{6}$$	$$K^{-1}$$	Coefficient of thermal (linear) expansion (range 20°C–T)
$$\varkappa$$	$$\frac{W}{m\cdot K}$$	Coefficient of thermal conductivity (the heat capacity of the material)
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material
$$c\cdot 10^{-3}$$	$$\frac{J}{kg\cdot K}$$	The specific heat of the material (range 20°C–T)

Description of mechanical properties

Parameter	Units of measurement	Description
d5	%	Elongation at break
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\sigma_{P}$$	$$MPa$$	Proportionality limit
$$\psi$$	%	Reduction in cross section on fracture

Designation of types of weldability

Parameter	Units of measurement	Description
no limits		Welding is performed without heating and without subsequent heat treatment
Boundedly welded		Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld		For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures

Description of temperatures of critical points

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