EP991 (02X20N25GM4B)

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % V, % P, % C, % S, % Nb, % Mo, % N, %
44.95–48.95 < 0.1 1.5–2.5 20–21 25–26 0.05–0.3 < 0.01 < 0.015 < 0.01 0.6–0.9 3.9–4.2 < 0.015

Information on suppliers

Physical characteristics

Temperature, °C E\cdot 10^{9}, MPa \varkappa, \frac{W}{m\cdot K} \rho, \frac{kg}{m^3}
20 202 12.8 8150

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}, MPa \sigma_{Y}, MPa d5, % Treatment
Band GOST 24982-81 < 75 Transverse raw, hot rolling, thin, Transverse 900–950 420–450 30–35

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Band GOST 24982-81 raw, hot rolling, thin, Transverse 205–215

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Boundedly welded insensitive loathsome

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Ni % Nickel
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
Nb % Niobium
Mo % Molybdenum
N % Nitrogen

Description of physical characteristics

Parameter Units of measurement Description
E\cdot 10^{9} MPa Elastic modulus
\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