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Steel 20GSL

Designation

Name The value
Designation GOST Cyrillic 20ГСЛ
Designation GOST Latin 20GCL
Transliteration 20GSL
The 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
Castings, steel 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 (cast iron and steel) В83 OST 108.961.02-79, OST 108.961.03-79
Welding and cutting of metals. Soldering, riveting В05 RTM 108.020.122-78
Pipes steel and connecting parts 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 The rest ≤0.3
TU 5.961-11151-92 0.16-0.22 ≤0.03 ≤0.03 1-1.3 - 0.6-0.8 - The 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 The 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 characteristics

Section, mm sT|s0,2, MPa σB, MPa d y, % kJ/m2, кДж/м2 Brinell hardness number, 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
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Technological properties

Name The value
Weldability Satisfactory weldability.
Defect welding 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.

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