34HN3MA (0ХН3М)

shafts, rotors, steam turbine wheels, shafts, gears, couplings, gears and other special responsibility heavy duty parts operating at temperatures up to 500 degrees C


Country Section Category
CIS, Russia, Ukraine Structural steel Alloyed structural steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % P, % C, % S, % Mo, %
TU 108-1028-81 93.115–95.33 0.17–0.37 0.5–0.8 0.7–1.1 2.75–3.75 < 0.03 0.3–0.4 < 0.035 0.25–0.4

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Forgings < 100 950 800 12 40

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy 293–331

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Difficult to weld sensitive loathsome

Critical point temperatures

Ac1, K Ac3(Acm), K
720 790


Standard Description
TU 108-1028-81

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 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

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