14H17N2 (EI268, 1X17H2)

Blades, discs, propeller shafts of submarines, parts of the rotation in the food equipment (steel food group), bushings.

blades, discs, shafts, bushings, flanges, fasteners and other details, the details of compressor machines running on nitrous gas, parts operating in aggressive environments and at low temperatures; martensitic steel — ferritic class

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant heat-resistant steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	77.175–82.39	< 0.8	< 0.8	16–18	< 0.2	< 0.3	1.5–2.5	< 0.03	0.11–0.17	< 0.025

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	197		20.9	7750	0.72
100		9.8	21.7		0.78
200		10.6	22.6		0.84
300	167	10.8	23.4		0.89
400		11	24.3		0.99
500	151	11.1	25.1		1.04
600	136	11.8	25.9		1.11
700		11	26.8		1.13
800		10.7	28		1.16
900		11.4	29.7		1.17
1000		11.5			1.18

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rod	GOST 5949-75	60			1080	835	10	30	490	Hardening of 975-1040 ° C, the oil, leave 275-350 ° C, air
Rod	GOST 5949-75	60			835	635	16	55	750	Hardening of 1000-1030 ° C, the oil, leave 620-660 ° C, air
Forgings	GOST 25054-81	< 1000			686	539	12–15	30–40	490–590	Hardening of 980-1020 ° C, the oil, leave 680-700 ° C, air
The plates	GOST 7350-77				1080	885	10			Hardening and tempering

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 25054-81	Hardening, average vacation	228–293
Rod	GOST 5949-75	annealing	285
Rod	GOST 18907-73	annealing	302

Technological Properties

Weldability	Propensity to temper brittleness
Weldability	Propensity to temper brittleness
Difficult to weld	inclined

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₁, K
Ac₁, K	Ac₃(Ac_m), K	Ar₁, K
720	830	700

Analogues

Germany	USA
Germany	USA
X22CrNi17	431

Standards

Standard	Description
Standard	Description
GOST 5632-72
GOST 5949-75
TU 14-1-377-72

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of physical characteristics

Parameter	Units of measurement	Description
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
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)
$\psi$	%	Reduction in cross section on fracture
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Designation of types of weldability

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