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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 38KHА ( 38HА, 38ХА ).

Material :	38KHА ( 38HА, 38ХА )
Substitute:	40Х, 35Х, 40ХН
Classification :	Alloy structurall steel

Chemical composition in % of the material 38KHА ( 38HА, 38ХА ) .

C	Si	Mn	Ni	S	P	Cr	Cu
0.35 - 0.42	0.17 - 0.37	0.5 - 0.8	max 0.3	max 0.025	max 0.025	0.8 - 1.1	max 0.3

Temperature of critical points of the grade 38KHА ( 38HА, 38ХА ).

Ac₁ = 740 , Ac₃(Ac_m) = 780 , Ar₃(Arc_m) = 730 , Ar₁ = 693 , Mn = 250

Mechanical properties under Т=20^oС of the material 38KHА ( 38HА, 38ХА ) .

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
Bar	Ж 25		930	780	12	50	880	Guenching 860^oC, oil, Drawing 550^oC, water,

Brinell hardness of the material 38KHА ( 38HА, 38ХА ) (annealing) ,

HB 10^-1= 207 MPa

Physical properties of the material 38KHА ( 38HА, 38ХА ) .

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	1.96			7850		290
100		12.7	50
200		13.1	46	7800
300		13.5	42
400		13.8	40
500		14.2	37
600		14.6	35	7650
700			31
T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹

Technological properties of the material 38KHА ( 38HА, 38ХА ) .

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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