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
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, %
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

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
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
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
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
Difficult to weld inclined

Critical point temperatures

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

Analogues

Germany USA
X22CrNi17 431

Standards

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

Description of chemical elements

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
$$E\cdot 10^{9}$$ $$MPa$$ 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
$$\sigma _{U}$$ $$MPa$$ 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
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
Ac1 K
Ac3(Acm) K
Ar1 K