Steel 15ГС

Designation

Name	The value
Designation GOST Cyrillic	15ГС
Designation GOST Latin	15GC
Transliteration	15GS
By chemical elements	15MnС

Description

15ГС steel is used: for the manufacture of rolled plate, long products and pipe blanks; parts such as bottoms, collar flanges, fittings, rings, tubes, tees and parts of rectangular shape for power equipment and pipelines with an absolute pressure of more than 3.9 MPa and thermal power plants; components for fixed piping of the feed water of boilers SVP, operating at temperatures up to +280 °C; the equipment and pipelines of nuclear power plants (NPP); of billets intended for the manufacture of seamless cold, warm, hot-wrought, including hot-pressed and hot-pressed pipes is reduced, designed for steam boilers and pipelines, installations with high and supercritical steam parameters.

Standards

Name	Code	Standards
Processing of metals by pressure. Forgings	В03	GOST 8479-70, OST 108.030.113-87, OST 26-01-135-81, TU 108.1267-84, TU 108.11.653-82
Welding and cutting metals. Soldering, riveting	В05	OST 24.125.02-89
Steel pipes and fittings to them	В62	OST 24.125.30-89, TU 14-3-420-75, TU 14-3-463-2005, TU 14-3-460-2009, TU 1301-039-00212179-2010, TU 1310-030-00212179-2007, TU 108-874-2012, TU 14-3Р-55-2001, TU 14-3-460-2003
Bars and shapes	В32	TU 108-771-84, TU 108.772-85, TU 14-1-1529-2003
Sheets and strips	В33	TU 108.1268-84
Blanks. Of the workpiece. Slabs	В31	TU 108.1398-86, TU 108-938-80, TU 14-1-1787-76, TU 14-1-2560-78, TU 14-1-4992-91, TU 24-11.006-89

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Mo
TU 14-3-460-2003	0.12-0.18	≤0.025	≤0.025	0.9-1.3	≤0.3	0.7-1	≤0.3	Rest	≤0.3	-
TU 108-874-2012	0.13-0.17	≤0.025	≤0.03	0.9-1.3	≤0.3	0.7-1	≤0.3	Rest	≤0.3	≤0.3
TU 14-3Р-55-2001	0.12-0.18	≤0.025	≤0.035	0.9-1.3	≤0.3	0.7-1	≤0.3	Rest	≤0.3	-
TU 1301-039-00212179-2010	0.12-0.18	≤0.025	≤0.035	0.9-1.3	≤0.3	0.7-1	≤0.3	Rest	≤0.3	≤0.15

Fe is the basis.
According to TU 108.1268-84, the technological addition of rare earth metals is allowed up to 0.20% by calculation.
According to TU 14-1-1529-2003 and TU 14-3-460-2003 for steel produced by scrap process or from cuprous ores, the mass fraction of residual copper and nickel is allowed up to 0.30% of each. A technological addition of rare earth elements is allowed to improve the quality of the metal.
According to TU 14-3R-55-2001, the content of nickel and chromium is allowed to not exceed 0.40% of each. The presence of rare-earth elements introduced as technological additives is allowed.
According to TU 1301-039-00212179-2010 the chemical composition is given for steel grade 15GS-III. The content of each impurity element, not regulated by the table, is allowed up to 0.050%.
According to TU 108-874-2012 the chemical composition is given for steel grade 15GS. The presence of rare-earth elements in steel is not a defective feature. Permissible deviations in chemical composition: carbon ± 0.020%, silicon ± 0.050%, manganese ± 0.10%, chromium ± 0.050%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	y, %	KCU, kJ/m²
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥237	-	-	-	-	-
Pipe. Normalization at 900 - 930°C, air cooling
-	-	≥500	16-18	-	40-45	-
Tubular billet + hot deformed Tubes (DH=57-465 mm) TU 14-3-460-2003. Normalization at 900-930 °C, air cooling
20-25	≥295	490-640	≥16	-	≥40	≥490
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥213	-	-	-	-	-
Tubular billet + hot deformed Tubes (DH=57-465 mm) TU 14-3-460-2003. Normalization at 900-930 °C, air cooling
20-25	≥295	490-640	≥18	-	≥45	≥590
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥202	-	-	-	-	-
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 900-930 °C, air cooling
-	≥294	≥490	≥16	-	≥40	≥490
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥249	-	-	-	-	-
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 900-930 °C, air cooling
-	≥294	≥490	≥18	-	≥45	≥590
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥235	-	-	-	-	-
Pipe seamless steel 15ГС-ø in delivery condition on the other 1301-039-00212179-2010. Normalization at 900-930 °C, air cooling (allowed after normalization the holidays at 630-670 °C)
-	≥295	490-610	≥16	-	≥40	≥590
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥196	-	-	-	-	-
Pipe tsentrobezhnolityh, heat-treated on the other 108-874-2012
-	≥274	470-617	-	≥20	≥40	≥490
Sheet metal 25-140 mm. Normalization at 900-930 °C, air cooling + Vacation at 650-680 °C, air cooling (the average data)
-	≥190	-	-	-	-	-
-	≥178	-	-	-	-	-
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 900-930 °C, air cooling
-	≥245	-	-	-	-	-
-	≥167	-	-	-	-	-
-	≥127	-	-	-	-	-

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
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness

Technological properties

Name	The value
Weldability	Without restrictions.
Склонность к отпускной хрупкости	Tend not.
Flock-sensitive sensitivity	not sensitive.
Macrostructure and pollution	In the macrostructure of the pipe on the other 108-874-2012 should not be cracked, placenow and bundles. Allowed separate slag and sand inclusions, and a gas sink maximum linear size up to 1 mm. increased Local travelmasti metal 1-5 points scale rejection of the sign is not. Contamination of the metal pipes, non-metallic inclusions should not exceed the arithmetic mean score of the sulphides 2.5 points, according to the oxides - 3.5 points, silicates - 4 points scale.
Microstructure	On the other 108-874-2012 the size of ferritic grains should be no larger than 7 points according to GOST 5639.
Particularities of production of goods	Pipe tsentrobezhnolityh on the other 108-874-2012 are delivered in heat treated condition. Tubes are homogenized and anti-flake annealing, the modes of which shall be agreed with TSNIITMASH. The mode of heat treatment: Normalization at 930-960 °C. be conducted after normalization, tempering at 630-670 °C.