10H7MVFBR (EP505)

in power engineering — pipes and parts for continuous operation at temperatures of 600−620 degrees.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Heat resistant steels and alloys	Heat resistant high alloy steel

Chemical composition

Standard	Fe, %	B, %	Cr, %	Ni, %	V, %	P, %	C, %	S, %	Nb, %	Mo, %
Standard	Fe, %	B, %	Cr, %	Ni, %	V, %	P, %	C, %	S, %	Nb, %	Mo, %
GOST ЧМТУ 1154-64	88.925–92.28	< 0.005	6–8	0.5–1	0.3–0.5	< 0.025	0.07–0.12	< 0.025	0.15–0.4	0.7–1

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	246		25.5	7850	0.51
100	239.6	10.25
200	239	11.6
300	219.5	12.4
400	200.6	12.75
500	192	13.25
600	185	13.6
700	168.5	13.4
800	144.5

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		690	580	20	65	1000	Normalization of 980-100 ° C, air cooling, and Holidays 700-730 ° C, 3 hours, air cooling
Pipe billet			Longitudinal		690	610	18	59	530	Annealing 800-830 ° C, furnace cooled, 30 ° C / h

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
860	905	435	350

Standards

Standard	Description
Standard	Description
GOST ЧМТУ 1154-64

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
B	%	Bor
Cr	%	Chrome
Ni	%	Nickel
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium
Mo	%	Molybdenum

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
$$R\cdot 10^{-6}$$	$$\Omega\cdot m$$	Electrical resistivity

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

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₃(Arc_m)	K
Ar₁	K