12H12MVFBR (EP752)
pipes for continuous operation at temperatures up to 630 deg C.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Heat resistant steels and alloys |
Heat resistant high alloy steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
B, % |
Mn, % |
Cr, % |
Ni, % |
V, % |
P, % |
C, % |
S, % |
Nb, % |
Mo, % |
W, % |
|---|
| TU 7845223-69 |
81.77–86.35 |
< 0.5 |
< 0.08 |
0.5–1 |
11–13 |
0.5–1 |
0.15–0.3 |
< 0.025 |
0.1–0.15 |
< 0.025 |
0.15–0.3 |
0.7–1 |
0.55–0.85 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
|---|
| 20 |
228 |
|
27.6 |
7850 |
| 100 |
|
11.15 |
21.8 |
|
| 200 |
215 |
11.13 |
24 |
|
| 300 |
209 |
11.42 |
25.1 |
|
| 400 |
195 |
11.8 |
26.3 |
|
| 500 |
188 |
12 |
27.2 |
|
| 600 |
173 |
12.15 |
28 |
|
| 700 |
155 |
12.15 |
28.9 |
|
| 800 |
|
12.65 |
|
|
| 900 |
|
11.6 |
|
|
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 |
|---|
| Trumpet |
|
|
Longitudinal |
|
820 |
640 |
17 |
|
|
Normalization of 1000-1050 ° C, air cooling, and Holidays 750-780 ° C, 3 hours, air cooling |
| Pipe billet |
|
|
Longitudinal |
|
880 |
740 |
20 |
64 |
1300 |
Normalization of 1000-1050 ° C, air cooling, and Holidays 750-780 ° C, 3 hours, air cooling |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| B |
% |
Bor |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| V |
% |
Vanadium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Nb |
% |
Niobium |
| Mo |
% |
Molybdenum |
| W |
% |
Tungsten |
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 |
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 |