ϰ
Wm⋅K
ρ
kgm3
c⋅10−3
Jkg⋅K

9H2MF

Steel is not used for welded structures, prone to temper embrittlement. Flock sensitivity: sensitive. Temperature of critical points: Ac1 = 748, Ac3 (Acm) = 784, Ar3 (Arcm) = 685, Ar1 = 640, Mn = 175.

work rolls for cold rolling of metals under the most severe operating conditions, the work rolls and wire crimping section mills.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % V, % P, % C, % S, % Mo, %
OST 24.013.20 - 0 94.69–96.7 0.25–0.5 0.2–0.7 1.7–2.1 < 0.5 0.1–0.2 < 0.03 0.85–0.95 < 0.03 0.2–0.3

Information on suppliers

Physical characteristics

Temperature, °C \varkappaϰ, \frac{W}{m\cdot K}Wm⋅K \rhoρ, \frac{kg}{m^3}kgm3 c\cdot 10^{-3}c⋅10−3, \frac{J}{kg\cdot K}Jkg⋅K
20 7840
100 37 0.44
200 34 0.46
300 32 0.5
400 32 0.57
500 32 0.68
600 30 0.8
700 23 0.94
800 20 1.1
900 14 0.5
1000 0.5

Technological Properties

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

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K Mn, K
748 784 685 640 175

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
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum

Description of physical characteristics

Parameter Units of measurement Description
\varkappaϰ \frac{W}{m\cdot K}Wm⋅K Coefficient of thermal conductivity (the heat capacity of the material)
\rhoρ \frac{kg}{m^3}kgm3 The density of the material
c\cdot 10^{-3}c⋅10−3 \frac{J}{kg\cdot K}Jkg⋅K The specific heat of the material (range 20°C–T)

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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar3(Arcm) K
Ar1 K
Mn K