EP999 Nickel Alloy (Alloy NM23HYU)

No foreign analogues

The alloy is used in the chemical industry for the manufacture of equipment parts operating in particularly aggressive environments.

Classification

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

Chemical composition

Standard Si, % Mn, % Cr, % Ni, % Al, % Mo, %
GOST 5632-14 < 0.1 < 0.2 2.5–2.9 70.6–73.7 1.8–2.2 22–24

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 190 12.6 11.8 7900

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 1000 380 35

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Sheet GOST 24982-81 raw, rolling, thin, Transverse 280–310

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Difficult to weld insensitive loathsome

Standards

Standard Description
GOST 5632-14

Description of chemical elements

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

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
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