75HM

Steel is not used for welded structures, not prone to temper embrittlement. Flock sensitivity: insensitive. Substitute 9Х2.

working and supporting rolls of sheet mills for hot rolling of ferrous metals, the supporting rolls and two four-high stand sheet mills, cold rolling metal.

Classification

Country Section Category
CIS, Russia, Ukraine Tool steel Roll tool steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % P, % C, % S, % Mo, %
OST 24.013.20 - 0 95.34–97.3 0.2–0.6 0.2–0.7 1.4–1.7 < 0.5 < 0.03 0.7–0.8 < 0.03 0.2–0.3

Information on suppliers

Physical characteristics

Temperature, °C \varkappa, \frac{W}{m\cdot K} \rho, \frac{kg}{m^3} c\cdot 10^{-3}, \frac{J}{kg\cdot K}
20 7900
100 45 0.49
200 41 0.5
300 40 0.53
400 39 0.57
500 38 0.64
600 37 0.75
700 35 0.9
800 0.7
900 0.76
1000 0.81

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
Metal rolling 500 750 430 19 41 240 Double normalization with tempering

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Not applicable for welded structures insensitive not inclined

Standards

Standard Description
OST 24.013.20 - 0

Description of chemical elements

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

Description of physical characteristics

Parameter Units of measurement Description
\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)

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