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

Standard Description
TU 7845223-69

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