12X18H9T (X18H9T)

Springs for t-p up to 300 ° C, as well as sheets with high strength for transport, muffles of thermal furnaces, parts for fixing heat exchangers, walking furnaces, casings, supports up to 800 degrees. 7920kg / m3

Welded equipment, pipes, fittings furnace parts, heat exchangers, muffles, parts of exhaust systems, flat and long parts. Apparatus and vessels operating at temperatures from -196 to 600 ° C under pressure and in the presence of corrosive media to 350 ° C .; austenitic steel

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, %
GOST 5632-72 68.225–75 < 0.8 < 2 17–19 < 0.3 8–9.5 < 0.035 < 0.12 < 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
20 195 7900 0.725
100 189 16.6 16 7860 0.469 0.792
200 182 17 18 7820 0.486 0.861
300 175 17.6 20 7780 0.498 0.92
400 167 18 21 7740 0.511 0.976
500 18.3 23 7690 0.519 1.028
600 153 18.6 25 7650 0.528 1.075
700 143 18.9 26 7600 0.532 1.117
800 135 19.3 28 7560 0.544 1.149
900 19.5 29 7510 0.548 1.176
1000 20.1

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}, MPa \sigma_{P}, MPa \epsilon_L, % \psi, % Treatment
Rod GOST 5949-75 < 60 540 196 40 55 Hardening of 1020-1100 ° C, air cooling
The bar is hardened. GOST 18907-73 880–930
Wire GOST 18143-72 590–880 20–25
Forgings GOST 25054-81 < 1000 510 196 35–40 40–48 Hardening of 1050-1100 ° C
The plates GOST 7350-77 530 215 38 Hardening of 1030-1080 ° C, cooling water

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Forgings GOST 25054-81 1700

Technological Properties

Weldability
no limits

Analogues

Germany USA
X10CrNiTi18-9 321

Standards

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
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

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