Low carbon structural steel 15X25T alloyed with chrome and titanium (EI439, X25T)

Thermocouple covers, det. furnace arm up to 1000 deg., electrodes of spark plugs, tubes of heat exchangers, pyrolysis plants in aggressive environments up to 350 deg.

for welded structures that are not exposed to shock loads at operating temperatures from -20 ° C to 1100 ° C. Pipes for heat exchangers operating in aggressive environments. Equipment, parts, thermocouple covers, spark-ignition spark electrodes, heat exchangers .; ferritic steel

Classification

Country Section Category
CIS, Russia, Ukraine Corrosion-resistant alloys and steels Corrosion-resistant heat-resistant steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % P, % C, % S, %
GOST 5632-72 70.99–76 < 1 < 0.8 24–27 < 0.035 < 0.15 < 0.025

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Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 204 17 7600 0.71
100 200 0.462
200 197 10
300 189 10.6
400 176 10.8
500 164 11.3
600 140 11.5
700 124 11.6
800 119 11.6
900 109 12.2

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
Pipes are coldly deformed. GOST 9941-81 461 17
Pipes are hot deformed. GOST 9940-81 441 17
Rod GOST 5949-75 440 295 20 45
The plates GOST 7350-77 440 14 200 Annealing
Sheet GOST 5582-75 530 17 Annealing 740-780 ° C

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Hire GOST 5949-75 raw, rolling, Transverse 230–270

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Difficult to weld insensitive inclined
Steel 15X25T / Aloro

Standards

Standard Description
GOST 5632-72
GOST 5949-75
GOST 5582-75
GOST 7350-77
GOST 9940-81
GOST 9941-81

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
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
$$c\cdot 10^{-3}$$ $$\frac{J}{kg\cdot K}$$ The specific heat of the material (range 20°C–T)
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ Electrical resistivity

Description of mechanical properties

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

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