12G2A

Production of tubular billet for the manufacture of seamless pipes.

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, %	P, %	C, %	S, %
OST 14-21 - 77	97.1–97.5	0.17–0.37	2–2.4	< 0.25	< 0.2	< 0.25	< 0.025	0.12–0.2	< 0.025

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\psi$ , %	d5, %	Treatment
Pipe billet	OST 14-21 - 77	Ø 80			500			20
Pipe billet	DSTU 3-009-2000				490	300	40	20

Standards

Standard	Description
OST 14-21 - 77

Description of chemical elements

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

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