12Г2С steel is used: for the manufacture of electrically welded pipes with a diameter of 530, 720 mm strength group C50 for construction of gas pipelines, oil pipelines and oil product pipelines.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	GOST 20295-85, GOST 24950-81, TU 14-3-1573-96
Sheets and strips	В33	TU 14-1-1921-76, TU 14-1-4323-88, TU 14-1-5241-93
Sheets and strips	В23	TU 14-1-3023-80

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	As	Ce
TU 14-1-1921-76	0.1-0.15	≤0.035	≤0.035	1.3-1.65	≤0.3	0.4-0.6	≤0.3	Rest	≤0.3	≤0.012	-	≤0.03
TU 14-3-1573-96	0.1-0.15	≤0.035	≤0.035	1.3-1.65	≤0.3	0.4-0.6	≤0.3	Rest	≤0.3	≤0.012	-	-
TU 14-1-4323-88	0.09-0.15	≤0.035	≤0.04	1.3-1.7	≤0.3	0.5-0.8	≤0.3	Rest	≤0.3	-	-	-
TU 14-1-5241-93	≤0.15	≤0.04	≤0.04	≤1.7	≤0.3	≤0.8	≤0.3	Rest	≤0.3	-	≤0.08	-

Fe is the basis.
According to TU 14-1-1921-76, instead of Ce, Ca ≤ 0.020% can be introduced.
According to TU 14-3-1573-96 carbon equivalent of Se ≤ 0.46%.
According to TU 14-1-4323-88 the chemical composition is given for steel grade 12G2S. For steel smelted with a scroll process, a copper content of up to 0.40% is allowed. In the finished rolled stock, provided mechanical properties are ensured, deviations in chemical composition are allowed in accordance with GOST 5632.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	KCU, kJ/m²
Sheet metal as supplied at TU 14-1-5241-93 (samples transverse)
8-50	≥285	≥450	≥21	-
Hot rolled plates for gas pipes (7,5-11,0 mm) TU 14-1-1921-76. Heating to 900-920 °C (exposure for 40 min), air cooling. Group strength C50
	≥345	≥490	≥22	≥390
The rental in the condition of delivery on the other 14-1-4323-88. In the graph indicated the value of KCU KCU-40 °C/KCU-75 °C
≤10	≥345	≥490	≥21	≥390/340
10-20	≥325	≥470	≥21	≥340/290
20-40	≥305	≥460	≥21	≥340/290
40-60	≥285	≥450	≥21	≥340/290
60-80	≥275	≥440	≥21	≥340/290
80-160	≥265	≥430	≥21	≥340/290
≤10	≥375	≥510	≥20	≥390/340
10-20	≥355	≥490	≥20	≥340/290
20-40	≥335	≥480	≥20	≥340/290
≤10	≥345	≥490	≥21	≥390/340
10-20	≥325	≥470	≥21	≥340/290
20-40	≥305	≥460	≥21	≥340/-
≤10	≥375	≥510	≥20	≥390/340
10-20	≥355	≥490	≥20	≥340/290
20-40	≥335	≥480	≥20	≥340/-
Longitudinal electric-welded pipes of oil and gas as delivered at TU 14-3-1573-96 (samples transverse; column cross section - outer diameter. wall thickness; in the graph the value is KCU KCU-40 °C)
1020 (10-12)	≥340	≥490	≥20	≥294
530, 630, 720 (11-12)	≥340	≥490	≥20	≥392
530, 630, 720 (7-10)	≥340	≥490	≥20	≥294
820 (9-12)	≥340	≥490	≥20	≥294

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
KCU	Toughness

Steel 12Г2С

Designation

Description

Standards

Chemical composition

Mechanical properties

Description mechanical marks

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