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Metals -> Structural steel -> Spring structural steel

Characteristics of the material 65G ( 65G, 65Г ).

Material :	65G ( 65G, 65Г )
Substitute:	70, У8А, 70Г, 60С2А, 9ХС, 50ХФА, 60С2, 55С2
Classification :	Spring structural steel

Chemical composition in % of the material 65G ( 65G, 65Г ) .

C	Si	Mn	Ni	S	P	Cr	Cu
0.62 - 0.7	0.17 - 0.37	0.9 - 1.2	max 0.25	max 0.035	max 0.035	max 0.25	max 0.2

Temperature of critical points of the grade 65G ( 65G, 65Г ).

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

Mechanical properties under Т=20^oС of the material 65G ( 65G, 65Г ) .

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
			980	785	8	30		As-delivered state
Band annealed	to 1.5		650		15

Brinell hardness of the material 65G ( 65G, 65Г ) (annealing) ,	HB 10^-1= 241 MPa
Brinell hardness of the material 65G ( 65G, 65Г ) (without heat treatment) ,	HB 10^-1= 285 MPa

Physical properties of the material 65G ( 65G, 65Г ) .

T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹
Grade	MPa	1/Grade	Watt/(m·Grade)	kg/m³	J/(kg·Grade)	Ohm·m
20	2.15		37	7850
100	2.13	11.8	36	7830	490
200	2.07	12.6	35	7800	510
300	2	13.2	34		525
400	1.8	13.6	32	7730	560
500	1.7	14.1	31		575
600	1.54	14.6	30		590
700	1.36	14.5	29		625
800	1.28	11.8	28		705
T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹

Technological properties of the material 65G ( 65G, 65Г ) .

Weldability:	is not used.
Flakes :	weakly predisposed
Temper brittleness:	predisposed

Specification :

Mechanical properties :
s_в	- Tensile strength , [MPa]
s_T	- Yield stress, [MPa]
d₅	- Specific elongation at fracture , [ % ]
y	- Reduction of area , [ % ]
KCU	- Impact strength , [ kJ / m²]
HB	- Brinell hardness , [MPa]

Physical properties :
T	- Test temperature , [Grade]
E	- Young modulus , [MPa]
a	- Coefficient of linear expansion (range 20^o - T ) , [1/Grade]
l	- Termal (heat) condition coefficient , [Watt/(m·Grade)]
r	- Density , [kg/m³]
C	- Specific heat ( range 20^o - T ), [J/(kg·Grade)]
R	- Electrical resistance , [Ohm·m]

Weldability :
without limitations	- welding is done without heating and subsequent heat treeting
limited weldability	- welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability	- obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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