12G2S

Alloy steel.

For the manufacture of welded longitudinal gas pipes for main gas and oil pipelines.

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, %	V, %	As, %	P, %	C, %	S, %	N, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	As, %	P, %	C, %	S, %	N, %
GOST 19281-2014	97.25–97.25	0.5–0.8	1.3–1.7	< 0.3	< 0.3	< 0.3	< 0.12	< 0.08	< 0.03	0.09–0.15	< 0.035	< 0.008

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Sheet	TU 14-1-1921-76				490	345	< 390	22
Grade	GOST 19281-2014	< 250			430	265		21
Grade	GOST 19281-2014	< 140			480	345		21

Standards

Standard	Description
Standard	Description
GOST 19281-2014	GOST

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
V	%	Vanadium
As	%	Arsenic
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
N	%	Nitrogen

Description of mechanical properties

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