12H18N12T (H18N12T)

various parts operating at temperatures from -196 to 600 ° C in harsh environments

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 64.725–72 < 0.8 < 2 17–19 < 0.3 11–13 < 0.035 < 0.12 < 0.02

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 205 15.1 7900 0.761
100 202 16.6 16.3 7860 0.46 0.8
200 197 17 17.6 7820 0.482 0.865
300 190 17.2 18.7 7780 0.507 0.93
400 181 17.5 20.4 7740 0.525 0.982
500 173 17.9 22.2 7690 0.545 1.038
600 160 18.2 24.1 7650 0.563 1.07
700 150 18.6 25.9 7600 0.579 1.12
800 18.9 27.4 7560 0.59 1.155
900 19.3 29.1 7510 0.603 1.21
1000 30.8 0.616 1.245
1100 32.3 0.625 1.275
1200 34.1 0.637 1.315

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 9940-81 529 40
Trumpet Longitudinal 540 220 35 55 Heating of 1050-1100 ° C, cooling water
Pipes are coldly deformed. GOST 9941-81 549 35
Rod GOST 5949-75 540 196 40 55 Hardening of 1020-1100 ° C, cooling water
The plates GOST 7350-77 530 235 38 Hardening of 1030-1080 ° C, cooling water

Technological Properties

Weldability
Boundedly welded

Analogues

Germany
1.4878 (X12CrNiTi18-9)

Standards

Standard Description
GOST 5632-72

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