30H2NMFA (30H2NMF)

For the manufacture of forgings (forging groups IV and V) gears and gear wheels, shafts, bushings, and clips gear couplings compressor machines; forgings shaft compressor units and gas turbines; critical parts of high strength and toughness, working in conditions of re-variable loads (crankshafts, gears, connecting rods, etc.); parts of large cross section, requiring high hardenability.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ti, % Cu, % Ni, % V, % P, % C, % S, % Mo, % W, %
TU 14-1-950-74 93.48–95.68 0.17–0.37 0.3–0.6 1.6–2 < 0.03 < 0.25 1.4–1.8 0.18–0.28 < 0.025 0.27–0.34 < 0.025 0.4–0.5 < 0.3

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{Y}$$, $$MPa$$ $$\psi$$, % $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ d5, % Treatment
Rod TU 14-1-950-74 Ø 25 1030–1175 835–980 45–55 685–980 10–12 Hardening and tempering

Standards

Standard Description
TU 14-1-950-74

Description of chemical elements

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

Description of mechanical properties

Parameter Units of measurement Description
d5 % Elongation at break
$$\sigma_{Y}$$ $$MPa$$ Yield strength
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\psi$$ % Reduction in cross section on fracture
$$KCU\cdot 10^{3}$$ $$\frac{J}{m^2}$$ Impact toughness