12H12MVFBR (EP752)

pipes for continuous operation at temperatures up to 630 deg C.

Classification

Country	Section	Category
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, %
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

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
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
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
Standard	Description
TU 7845223-69

Description of chemical elements

Element	Units of measurement	Description
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
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
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