EP998 Nickel Alloy (Alloy Х20Н73ЮМ)

No foreign analogues

The alloy is used to make turbine working parts.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % Al, % Mo, %
GOST 5632-14 1.3–2 < 0.2 < 0.2 19–21 71.2–75.3 3.1–3.6 1.3–1.8

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\rho$$, $$\frac{kg}{m^3}$$ Cp, Дж/кг·К
20 190 11.5 8300 450

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{Y}$$, $$MPa$$ d5, % Treatment
Sheet GOST 24982-81 <5.0 Transverse raw, rolling, thin, Transverse 880–920 400 35

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Sheet GOST 24982-81 raw, rolling, thin, Transverse 230

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits insensitive not inclined

Standards

Standard Description
GOST 5632-14

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Ni % Nickel
Al % Aluminium
Mo % Molybdenum

Description of physical characteristics

Parameter Units of measurement Description
Cp Дж/кг·К Specific heat of material
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\alpha\cdot 10^{6}$$ $$K^{-1}$$ Coefficient of thermal (linear) expansion (range 20°C–T)
$$\rho$$ $$\frac{kg}{m^3}$$ The density of the material

Description of mechanical properties

Parameter Units of measurement Description
d5 % Elongation at break
$$\sigma_{Y}$$ $$MPa$$ Yield strength
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength

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