09G2 (10G2, 09G2S, 09G2D)

Unalloyed high quality manganese steel. Not prone to temper embrittlement: Weldability without restrictions. Flock sensitivity: not sensitive.

Rack of farms, the top trim cars, spinal beams, I-beams and other parts of car building, parts of excavators, the elements of welded metal and other parts operating at temperatures from -40 to +450 C.

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Low alloy structural steel for welded structures

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % As, % P, % C, % S, % N, %
GOST 19281-89 96.647–98.43 0.17–0.37 1.4–1.8 < 0.3 < 0.3 < 0.3 < 0.08 < 0.035 < 0.12 < 0.04 < 0.008

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Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % Treatment
Sheet GOST 19282-73 4 450 310 21
Grade GOST 19281-2014 < 140 480 345 21

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits not sensitive not inclined

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K Mn, K
720 830 710 620 320
09G2 / Aloro

Standards

Standard Description
GOST 19281-89

Description of chemical elements

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

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)

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