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Characteristics for grade 40NKM ( 40НКМ )

Grade :	40NKM ( 40НКМ ) ( 40НКМП )
Classification :	Magnetically soft precision alloy
Equivalent grades:	Is absent

Chemical composition in % for grade 40NKM ( 40НКМ )

Fe	C	Si	Mn	Ni	S	P	Mo	Co
28.13 - 32.1	max 0.03	max 0.3	0.3 - 0.6	39.3 - 40.7	max 0.02	max 0.02	3.8 - 4.2	24.5 - 26

Mechanical properties under Т=20^oС for grade 40NKM ( 40НКМ )

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
Band, GOST 10160-75			540	145	50
Band cold-worked , GOST 10160-75			980	980	4

Brinell hardness for 40NKM ( 40НКМ ) , Band GOST 10160-75

HB 10^-1 = 110 MPa

Physical properties for grade 40NKM ( 40НКМ )

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	1.8			8550		550
100		11

Types of delivery of grade 40NKM ( 40НКМ )

В30 - Classification, nomenclature and general norms

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]

40NKM ( 40НКМ ) - Magnetically soft precision alloy: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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