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Steel 20KHMFL

36CrNrL steel Steel 40G1 Steel 35KhNML Steel 35KhNL Steel 35KhN2ML Steel 35KhN2VL Steel 35KhML Steel 35KhGFL (35KhGF) Steel 35KhGSL 35KhGL steel Steel 35NGML Steel 35GTRL Steel 35GL Steel 32X06L 30KhNML steel 30KhML steel 30XL steel 30ХГФРЛ steel Steel 30ХГСФРЛ 30KhGSFL steel 30KhG1 steel Steel 30Х3С3ГМЛ 30GSL steel 30GL steel Steel 5MFRL X8ML steel X15L steel KPL steel VKL-5 steel Steel 80GSL Steel 75KhNMFL Steel 70X2GL 70GL steel Steel 60KhGL 5KhNML steel Steel 5FL Steel 28X11ML Steel 55SL 50KhGL steel Steel 45FL 45GL steel 40KhFL steel 40KhNL steel 40KhN2L steel 40KhML steel 40KhL steel 40KhGRL steel 40GTL steel Steel 12Х2НМЛ (VKL-3М) 20GL steel 16KhGTL steel Steel 16Х3МФЛ 15XL steel 15KhGSML steel Steel 15Х1М1ФЛ 15GNFL steel 15GNL steel 15GL steel Steel 13KhNDFTL Steel 12Х7Г3СЛ 20GML steel Steel 12Х2НВМЛ (VKL-3) Steel 12DKhN1MFL Steel 12DN2FL 08TL steel Steel 08N6G4ML 08GNFL steel 08GNL steel Steel 08GDNL (SL-30) 08G2FL steel Steel 03N12H5M3TUL Steel 03N12H5M3TL 20XL steel Steel 25KhGSL Steel 25KhGL Steel 25Х2ГНМФЛ Steel 25GSL Steel 23ХГСС2МФЛ Steel 23GNMFL 20KhNFL steel 20KhNL steel 20XHN3L steel 20KhMFL steel 20KhML steel Steel 27Х5GSML 20KhGSL steel Steel 20Х3МВФЛ (ЭИ415Л) 20FL steel 20DHL steel 20GFL steel (20G1FL) 20GTL steel 20GSL steel 20GNFL steel 20GNMYL steel 20GNMFL steel

Designation

Name The value
Designation GOST Cyrillic 20ХМФЛ
Designation GOST Latin 20XMFL
Transliteration 20HMFL
The chemical elements 20CrMoV

Description

20KHMFL steel is used: for the manufacture of parts of valves, body parts, cylinders, casting parts, steam, gas, hydraulic turbines and axial compressors operating at temperatures to +540 °C; casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations.

Note

Steel pearlitic class.

Standards

Name Code Standards
Castings, steel В82 GOST 977-88, OST 108.961.04-80, TU 108.02.123-87, 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

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo
OST 108.961.02-79 0.18-0.25 ≤0.025 ≤0.025 0.6-0.9 0.9-1.2 0.2-0.4 ≤0.3 The rest ≤0.3 0.2-0.3 0.5-0.7
GOST 977-88 0.18-0.25 ≤0.025 ≤0.025 0.6-0.9 0.9-1.2 0.2-0.4 - The rest - 0.2-0.3 0.5-0.7
Fe is the basis.
According to OST 108.961.04-80, the total sulfur and phosphorus content should be ≤ 0.050% for all possible tolerances.
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
Normalization at 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C, air cooling
100 ≥275 ≥491 ≥16 ≥35 ≥294 -
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Homogenization at 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C. the Critical temperature of brittleness of TKO ≤ 55 °C.
- ≥275 ≥490 ≥16 ≥35 ≥490 159-223
Casting parts of gas turbines. Homogenization at 970-1000 °C, air cooling + Normalization at 960-980 °C, air cooling + Vacation at 710-740 °C, air cooling
- ≥314 ≥490 ≥15 ≥30 ≥290 159-223
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Homogenization at 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C. the Critical temperature of brittleness of TKO ≤ 55 °C.
- ≥260 ≥480 - ≥32 - -
Casting parts stationary steam turbines. Homogenization (normalization) when 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C, air cooling
150х170 280-550 ≥500 ≥16 ≥35 ≥294 156-223
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Homogenization at 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C. the Critical temperature of brittleness of TKO ≤ 55 °C.
- ≥250 ≥470 - ≥34 - -
Casting parts stationary steam turbines. Homogenization (normalization) when 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C, air cooling
100х150 300-550 ≥500 ≥16 ≥35 ≥294 159-223
Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Homogenization at 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C. the Critical temperature of brittleness of TKO ≤ 55 °C.
- ≥250 ≥460 - ≥35 - -
Casting parts stationary steam turbines. Homogenization (normalization) when 970-1000 °C + Normalization at 960-980 °C + Vacation at 710-740 °C, air cooling
60х150 320-550 ≥500 ≥16 ≥35 ≥294 159-223

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 Limited weldability. The welding process - SMAW. When welding requires preheating. After welding and repair of defects by welding is used vacation at 690-710 °C.
Defect welding Welding defects of castings after cutting is carried out with preliminary and attendant heating up to 350-400 °C. for semi-automatic welding in carbon dioxide environment used wire SV-08ХГСМФА with a diameter of 2 mm at a current of 300-350 A. Welding defects by manual welding is done with electrodes type e-09Х1МФ (GOST 9467) brand ЦЛ20. When heat treated after welding defects to cool in the oven to 100-150 °C at a rate of 30-50 °C/h and further in the air.

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