90HF (9H1F, 9HF)

Steel is prone to temper embrittlement, does not apply to welded structures. Flock sensitivity: sensitive. Temperature of critical points: Ac1 = 700, Mn = 215. Hardness after annealing (GOST 5950): HB 10 -1 - = 241 MPa .

frame, belt, circular saws, knives for cold metal cutting, trimming dies and punches cold cutting burrs punches. Work and backup rolls for the cold rolling of metal. Rail and structural steel work rolls, Large-size and wire crimping and rolling mills for hot rolling metal, exposed to intensive wear and work in conditions of minimal or mild shock. The work rolls, backup rolls and bandages composite supporting rolls of sheet, crimping and rolling mills for hot rolling metal.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % V, % P, % C, % S, %
GOST 5950-73 96.44–98.2 0.15–0.35 0.3–0.6 0.4–0.7 < 0.3 < 0.35 0.15–0.3 < 0.03 0.8–0.9 < 0.03

Information on suppliers

Physical characteristics

Temperature, °C \varkappa, \frac{W}{m\cdot K} c\cdot 10^{-3}, \frac{J}{kg\cdot K}
100 44 0.46
200 42 0.5
300 38 0.56
400 36 0.62
500 33 0.67
600 31 0.73
700 29 1.32
800 27 0.72
900 27 0.64
1000 0.65

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 990 670 19 55 450 Normalization 870 ° C, 650 ° C and Holidays

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 5950-73 annealing 241

Technological Properties

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

Critical point temperatures

Ac1, K Mn, K
700 215

Standards

Standard Description
GOST 5950-73

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur

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)
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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Mn K