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Steel 18KH11MNFB (ЭП291)

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 18Х11МНФБ
Designation GOST Latin 18X11MHFB
Transliteration 18H11MNFB
The chemical elements 18Cr11MoНVNb
Name The value
Designation GOST Cyrillic ЭП291
Designation GOST Latin EP291
Transliteration EhP291
The chemical elements -

Description

Steel 18KH11MNFB used: for the production of highly loaded parts; steam turbine blades operating at temperatures up to +580 °C and gas turbines; parts of valves, forgings, discs, rotors for steam and gas turbines, continuously operating at temperatures up to +600 °C.

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
Classification, nomenclature and general norms В30 GOST 5632-72
Sectional and shaped rolling В32 GOST 5949-75, GOST 18968-73, GOST 19442-74, TU 14-1-792-73, TU 14-11-245-88
Bulls. Blanks. Slabs В31 OST 108.020.03-82, OST 3-1686-90
Metal forming. Forgings В03 TU 0306.018-80

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo Nb W
GOST 5632-72 0.15-0.21 ≤0.025 ≤0.03 0.6-1 10-11.5 ≤0.6 0.5-1 The rest ≤0.3 0.2-0.4 ≤0.2 0.8-1.1 0.2-0.45 ≤0.2
Fe is the basis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Bars and strip hot rolled and forged GOST 18968-73. Normalization or annealing at 1000-1050 °C, cooling in air or in oil + Leave in 660-770 °C, air cooling
590-735 ≥740 ≥15 ≥50 ≥588 229-269
Bars hot rolled and forged according to GOST 5949-75. Annealing in air or in oil with 1080-1130 °C to + Leave in 660-770 °C, air cooling
590-735 ≥740 ≥15 ≥50 ≥588 -
Contoured rods (g/K, x/K and x/t for steam turbine blades; x/a and x/t for coupling blades of steam turbines) according to GOST 19442-74. Annealing in air or in oil with 1080-1130 °C to + Leave in 660-770 °C, air cooling (specified strength)
588-735 735-931 ≥15 ≥50 ≥588 229-255

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
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) a, 10-6 1/°С С, Дж/(кг · °С)
20 228 7850 - - -
100 222 - 214 103 485
200 213 - 251 106 530
300 205 - 259 108 590
400 193 - 263 113 667
500 180 - 272 117 770
600 - - 280 118 900
700 - - - 120 -
800 - - - 124 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability difficult weldability

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