09G2S (09G2, 09Г2ДТ, 09G2T, 10G2S)

Silvanized manganese steel; According to GOST 27772−88 corresponds to steel for building construction C345. Not prone to temper embrittlement: Weldability without restrictions. Flock sensitivity: not sensitive. .

The various components and elements of welded metal, operating at temperatures from -70 to + 425 ° C under pressure.

Classification

Country	Section	Category
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, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	As, %	P, %	C, %	S, %	N, %
GOST 19281-89	96.317–98.2	0.5–0.8	1.3–1.7	< 0.3	< 0.3	< 0.3	< 0.08	< 0.035	< 0.12	< 0.04	< 0.008

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$
100	11.4
200	12.2
300	12.6
400	13.2
500	13.8

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Sheet	GOST 5520-79				430–490	265–345	21	590–640
Trumpet	GOST 10705-80				490	343	20
Grade	GOST 19281-2014	< 250			430	265	21

Technological Properties

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

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
725	860	780	625

Analogues

Germany	Japan	China	Bulgaria	Hungary	Romania
Germany	Japan	China	Bulgaria	Hungary	Romania
1.5111 (9MnSi5)	SB49	12Mn	09G2S	VH2	VH2

Standards

Standard	Description
Standard	Description
GOST 19281-89

Description of chemical elements

Element	Units of measurement	Description
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 physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Designation of types of weldability

Parameter	Units of measurement	Description
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
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₃(Arc_m)	K
Ar₁	K