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Steel 20KH12VNMF (ЭП428; 20KH12VNMF-sh (ЭП427-W))

Steel 1Х14Н14В2М (ЭИ257) Steel 13Х15Н4АМ3 (EP310; VNS-5) Steel 15X11MF (1X11MF) Steel 15Х12ВНМФ (ЭИ802) Steel 15Х12Н2МВФАБ (EP517) Steel 15Х16К5Н2МВФАБ (EP866; VNS-30) Steel 16Х11Н2В2МФ (ЭИ962А) Steel 16Х12ВМСФ5Р Steel 16X12MVSFBR (EP823) 18X11MNFB steel (EP291) Steel 18Х12ВМБФР (ЭИ993) Steel 18Х14Н4АМ3 (VNS-43) 18Kh15N3M steel (DI1) Steel 13Х11Н2В2МФ (ЭИ961; ВНС-33) Steel 20X12VNMF (EP428; 20X12VNMF-S (EP427-S)) Steel 25Х13Н2ВМФ (EP65; 2Х13НВМФ) Steel 25Х18Н10В2 (EP610) Steel 25Х18Н8В2 (ЭИ946) Steel 31Х19Н9МВБТ (ЭИ572) Steel 37Х12Н8Г8МФБ (ЭИ481) Steel 40Х15Н7Г7Ф2МС (ЭИ388) Steel 42Х11М3Ф (EP890) Steel 45Х14Н14В2М (ЭИ69) Steel 45Х14Н14СВ2М (ЭИ240) Steel X12H20T2P (EI696A) X14H8M2 steel (EP509) Cr18N13C2AMVF5P steel Steel 09Х14Н19В2БР1 (ЭИ726) Steel 01X19Yu3Bch (EP904; 02X18Yu3B) Steel 04Х15Н11С3МТ Steel 06X14H5MF Steel 06Х16Н15М3Б (ЭИ847; 06Х16Н15М3Б) 06X16H15M3K steel Steel 07Х25Н16АГЦ (EP781) Steel 08X14MF Steel 08Х15Н24В4ТР (EP164) Steel 08Х15Н25М3ТЮБ Steel 08Х15Н5Д2Т (EP410; VNS-2; EP225) Steel 08Х16Н13М2Б (ЭИ680) Steel 09X14H16B (EI694) Steel 09X14H19V2BR (EI695R) Steel 13Х14Н3В2ФР (ЭИ736; 513Л) Steel 09Х16Н13М3 (ЭИ592) Steel 09Х16Н15М3Б Steel 09Х16Н16МВ2БР (ЭП184; Х16Н16МВ2БР) Steel 09Х16Н7М2Ю (ЗИ65) 10GN2MFA steel Steel 10Х11Н20Т3Р (ЭИ696) Steel 10Х11Н23Т3МР (ЭП33; ЭЦ696) Steel 10Х12Н22Т3МРУ (EP33U) Steel 10Х15Н28В2М4Б (EP485) Steel 10Х15Н9С3Б1 (EP302) 10Х9НСМФБ steel Steel 11Х11Н2В2МФ (ЭИ962)

Designation

Name The value
Designation GOST Cyrillic 20Х12ВНМФ
Designation GOST Latin 20X12BHMF
Transliteration 20H12VNMF
The chemical elements 20Cr12WНMoV
Name The value
Designation GOST Cyrillic ЭП428
Designation GOST Latin EP428
Transliteration EhP428
The chemical elements -
Name The value
Designation GOST Cyrillic 20Х12ВНМФ-Ш (ЭП427-Ш)
Designation GOST Latin 20X12BHMF-Sh (EP427-Sh)
Transliteration 20H12VNMF-Sh EhP427-Sh
The chemical elements 20Cr12WНMoV-Mg (ЭP427-Mg)

Description

20KH12VNMF steel is used: for the production of highly loaded parts, blades of steam and gas turbines operating at temperatures up to +580 °C, parts of valves, forgings, discs, rotors for steam and gas turbines, tires, diaphragms, bolts, nuts, pins and other highly loaded parts operating at temperatures up to +600 °C; the nozzle blocks, parts of turbines and flanged connections for steam lines of thermal power plants.

Note

Steel heat-resistant martensitic class.
The recommended maximum operating temperature for a very long time — up to +600 °C. the Temperature of beginning of intensive scaling in air +750 °C.

Standards

Name Code Standards
Sheets and stripes В23 GOST 103-2006
Sectional and shaped rolling В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and stripes В33 GOST 4405-75
Classification, nomenclature and general norms В30 GOST 5632-72
Sectional and shaped rolling В32 GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 18968-73, GOST 19442-74, TU 14-1-643-73, TU 14-11-245-88
Bulls. Blanks. Slabs В31 OST 108.020.03-82, OST 3-1686-90
Steam pipelines. Regulators. Superheaters Е26 OST 108.839.08-82, OST 108.839.10-82

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-643-73 0.17-0.23 ≤0.025 ≤0.03 0.5-0.9 10.5-12.5 ≤0.4 0.5-0.9 The rest - 0.15-0.3 - 0.5-0.7 0.7-1.1
GOST 5632-72 0.17-0.23 ≤0.025 ≤0.03 0.5-0.9 10.5-12.5 ≤0.6 0.5-0.9 The rest ≤0.3 0.15-0.3 ≤0.2 0.5-0.7 0.7-1.1
Fe is the basis.
According to TU 14-1-643-73, the chemical composition is given for steel grade 20Х12ВНМФ (ЭП428). In the steel grade 20Х12ВНМФ-Ш (ЭП428-Ш), the mass fraction of sulfur should not be more than 0,015%.

Mechanical characteristics

Section, mm σB, MPa y, % Brinell hardness number, MPa
The bars as supplied on the other 14-1-3697-84
450-640 ≥45 140-187

Description mechanical marks

Name Description
Section Section
σB Limit short-term strength
y The relative narrowing

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) a, 10-6 1/°С
0 212 7850 - -
20 212 7850 - -
100 207 7830 25 106
200 202 7800 25 109
300 196 7780 26 112
400 190 7760 26 114
500 181 7730 27 117
600 167 7700 27 119
700 - 7670 - 12
800 - - - 121
1000 - - - 107
1200 - - - 117

A description of the physical symbols

Name Description
Е The normal elasticity modulus
l Coefficient of thermal conductivity

Technological properties

Name The value
Weldability Steel difficult weldability. Method of welding - RDS, the necessary preheating and subsequent heat treatment.
Forging temperature Start - 1230 °C, the end of - 900 °C. the cross Sections up to 250 mm is subjected to annealing, one hypothermia. Sections from 250 to 400 mm - annealing and two hypothermia.
Workability by cutting In the annealed condition with HB 187 and blower SB=610 MPa Kn b.St.=0.6

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