Steel 20GSL

Designation

Name	The value
Designation GOST Cyrillic	20ГСЛ
Designation GOST Latin	20GCL
Transliteration	20GSL
By chemical elements	20MnС

Description

20GSL steel is used: for the manufacture of castings parts, high tensile strength; basic parts of hydraulic turbines, operating at temperatures up to +450 °C; casting parts for gas turbines and axial compressors operating at temperatures from -40 to +350 °C; stationary parts of steam turbines operating at temperatures up to +450 °C; casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations; tsentrobezhnolityh pipes used as components in equipment for metallurgical, engineering, glass, ceramic, mining and processing petrochemical industry and is intended for the manufacture of blanks and parts used in the composition of the products of aviation and the nuclear industry.

Note

Steel pearlitic class.

Standards

Name	Code	Standards
Steel castings	В82	GOST 977-88, OST 108.961.04-80, OST 5Р.9285-95, TU 108-23.45-88, TU 108.671-84, TU 108-978-80, TU 24-1-12-181-75, TU 03.12290-95, TU 5.961-11151-92
Castings with special properties (iron and steel)	В83	OST 108.961.02-79, OST 108.961.03-79
Welding and cutting metals. Soldering, riveting	В05	RTM 108.020.122-78
Steel pipes and fittings to them	В62	TU 1333-003-76886532-2014

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu
OST 5Р.9285-95	0.16-0.22	≤0.03	≤0.03	1-1.3	≤0.3	0.6-0.8	≤0.3	Rest	≤0.3
TU 5.961-11151-92	0.16-0.22	≤0.03	≤0.03	1-1.3	-	0.6-0.8	-	Rest	-
OST 108.961.03-79	0.16-0.22	≤0.025	≤0.025	1-1.3	≤0.3	0.6-0.8	≤0.3	Rest	≤0.3

Fe is the basis.
According to OST 5P.9285-95, the content of nickel and chromium up to 0.50%, copper to 0.40% and molybdenum to 0.12% is not a defect condition provided that the requirements of the standard are observed and if there are no specific instructions in the technical conditions of the order or drawing .
According to TU 5.961-11151-92 for castings of grades 1 and 2 the mass fraction of cobalt in steel should not exceed 0.20%, and for castings in the direct irradiation zone - 0.15%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d	y, %	KCU, kJ/m²	HB, MPa
Casting parts of gas turbines. Normalization when 890-930 °C, air cooling + Vacation at 630-660 °C, air cooling
-	≥275	≥490	≥18	≥30	≥390	124-151
Casting of body parts stationary steam turbines. Normalization at 880-930 °C + vacation at 630-660 °C, air cooling
-	≥230	-	-	-	-	-
Castings for shipbuilding. Normalization at 900-950 °C + Vacation at 570-600 °C, air cooling
-	≥300	≥550	≥18	≥30	≥300	149-197
Casting of body parts stationary steam turbines. Normalization at 880-930 °C + vacation at 630-660 °C, air cooling
-	≥200	-	-	-	-	-
-	≥280	≥500	≥18	≥30	≥294	-
-	≥180	-	-	-	-	-
Casting. Normalization at 870-890 °C + vacation at 570-600 °C, air cooling
100	≥294	≥540	≥18	≥30	≥294	-
Casting of body parts stationary steam turbines. Normalization at 880-930 °C + vacation at 630-660 °C, air cooling
-	≥170	-	-	-	-	-
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Normalization at 870-890 °C + Vacation at 570-600 °C. the Critical temperature of brittleness of TKO ≤ 50 °C.
-	≥294	≥540	≥18	≥30	≥392	-
-	≥260	≥480	-	≥22	-	-
-	≥240	≥460	-	≥20	-	-
-	≥220	≥440	-	≥20	-	-

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
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number

Technological properties

Name	The value
Weldability	Satisfactory weldability.
Welding defects	Welding defects of castings after cutting is usually carried out without heating. By semiautomatic welding in carbon dioxide environment used welding wire SV-08G2S diameter of 2 mm at a current of 380-420 A. Welding defects by manual welding is done with electrodes type e-50A (GOST 9467) brand SSSI-13/55. When welding the hard contour and the large sample volume required pre-heating to 200-250 °C. After welding and repair of defects by welding is used vacation at 570-600 °C.