EP644

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, %
54.525–61.35 < 0.7 25–28 12.5–14.5 < 0.6 0.8–1.2 < 0.035 0.35–0.42 < 0.02

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 200 11.8–12.2 14.2 7860

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{Y}$$, $$MPa$$ d5, % Treatment
Round GOST 5632-14 40 Transverse raw, hot rolling, fat, Transverse 1300–1650 760–820 10–15

Твёрдость по Роквеллу

Rolling Standard Classifiers Value, HRC
Round GOST 5632-14 raw, hot rolling, fat, Transverse 48–54

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Boundedly welded sensitive loathsome

Coefficients of Friction

coefficient of friction with lubrication
0.08–0.12

Limit operating modes

Standard Температура, °C Рекомендованная твердость вала, $$HB$$
GOST 5632-14 80–100 52–54

Heat Treatment Modes

Treatment
quenching 860gr (oil), tempering 550gr (water)

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

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