17H18N9 (2X18H9)

cold-rolled sheet and strip for increased strength of various parts and structures to be welded by spot welding, as well as for products subjected to spot welding; austenitic steel

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ti, % Cu, % Ni, % P, % C, % S, %
GOST 5632-72 68.935–74.87 < 0.8 < 0.2 17–19 < 0.5 < 0.3 8–10 < 0.035 0.13–0.21 < 0.02

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 199 18 7900 0.72
100 16 19 0.504 0.735
200 17 20 0.855
300 17.5 21 0.925
400 17.9 22 0.975
500 18.5 24 1.031
600 18.6 25 1.08
700 147 18.9 26 1.115
800 19.1 27 1.15
900 19.3 28 1.185
1000 19.5

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Pipes are hot deformed. GOST 9940-81 568 40
Pipes are coldly deformed. GOST 9941-81 568 35
Rod GOST 5949-75 < 60 570 215 40 55 Hardening of 1050-1100 ° C, air cooling
The bar is hardened. GOST 18907-73 880–930
Bar of specified strength GOST 18907-73 590–880 20
The plates GOST 7350-77 590 265 35 Hardening of 1080-1120 ° C, cooling water
Sheet GOST 4986-79 570 17–34 Hardening of 1050-1080 ° C, air
Sheet thin is half-worked. GOST 5582-75 740–930 25
Sheet GOST 5582-75 590 35 Hardening of 1050-1080 ° C, cooling water
The sheet is thin and hardened. GOST 5582-75 980–1230 13
The sheet is thin and hardened. GOST 4986-79 980 3–5

Analogues

Germany USA
X12CrNi18-8 S30200

Standards

Standard Description
GOST 5632-72

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
$$c\cdot 10^{-3}$$ $$\frac{J}{kg\cdot K}$$ The specific heat of the material (range 20°C–T)
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ 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