05G4MNF

Details welded-forged construction, as well as bimetal blades of water turbines and others.

Classification

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

Chemical composition

Standard Si, % Mn, % Ti, % Cu, % Ni, % V, % P, % C, % S, % Mo, %
OST 108.958.04 - 85 0.3–0.6 3.2–3.7 < 0.02 < 0.3 3–3.5 0.08–0.15 < 0.02 < 0.05 < 0.02 0.2–0.4

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
Forgings OST 108.958.04 - 85 < 350 680–750 490–545 45 490 18–22

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Forgings 207–320

Technological Properties

Weldability
no limits

Standards

Standard Description
OST 108.958.04 - 85

Description of chemical elements

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

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

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