08H18G8N2T (KO3, 0H18G8N2T)
for the manufacture of welded equipment operating in oxidizing environments at the operating temperature from -50 to 300 ° C.
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 |
67.46–74 |
< 0.8 |
7–9 |
17–19 |
0.2–0.5 |
< 0.3 |
1.8–2.8 |
< 0.035 |
< 0.08 |
< 0.025 |
Information on suppliers
Physical characteristics
Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
20 |
212 |
|
21 |
7700 |
|
0.71 |
100 |
203 |
12.3 |
|
|
0.462 |
|
200 |
195 |
|
|
|
|
|
300 |
184 |
|
|
|
|
|
400 |
177 |
|
|
|
|
|
500 |
164 |
|
|
|
|
|
600 |
167 |
|
|
|
|
|
700 |
146 |
|
|
|
|
|
800 |
161 |
|
|
|
|
|
Mechanical properties at 20 °C
Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ |
Treatment |
Forgings |
GOST 25054-81 |
< 600 |
Longitudinal |
|
588 |
265 |
|
|
|
The plates |
GOST 7350-77 |
|
|
|
590 |
345 |
20 |
590 |
Hardening of 980-1020 ° C, cooling water |
Technological Properties
Analogues
Germany |
USA |
4878 |
X6CrNiTi18-10 |
Standards
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) |
$$KCU\cdot 10^{3}$$ |
$$\frac{J}{m^2}$$ |
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 |
|
|