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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 50KH ( 50H, 50Х ).

Material :	50KH ( 50H, 50Х )
Substitute:	40Х, 45Х, 50ХН, 50ХФА
Classification :	Alloy structurall steel

Chemical composition in % of the material 50KH ( 50H, 50Х ) .

C	Si	Mn	Ni	S	P	Cr	Cu
0.46 - 0.54	0.17 - 0.37	0.5 - 0.8	max 0.3	max 0.035	max 0.035	0.8 - 1.1	max 0.3

Temperature of critical points of the grade 50KH ( 50H, 50Х ).

Ac₁ = 720 , Ac₃(Ac_m) = 770 , Ar₃(Arc_m) = 693 , Ar₁ = 660 , Mn = 250

Mechanical properties under Т=20^oС of the material 50KH ( 50H, 50Х ) .

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
Forging	to 100		590	345	18	45	590	Normalizing
Forging	100 - 300		590	345	17	40	540	Normalizing
Forging	300 - 500		590	345	14	38	490	Normalizing
Forging	500 - 800		590	345	12	38	390	Normalizing
Bar	Ж 25		1080	885	9	40	390	Guenching 830^oC, oil, Drawing 520^oC, water,

Brinell hardness of the material 50KH ( 50H, 50Х ) (annealing) ,

HB 10^-1= 229 MPa

Physical properties of the material 50KH ( 50H, 50Х ) .

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	2.07			7820
100		12.8
200		13
300		13.8
T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹

Technological properties of the material 50KH ( 50H, 50Х ) .

Weldability:	hard weldability.
Flakes :	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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