Alloy ХН73МБТЮ (ЭИ698)

Designation

Name The value
Designation GOST Cyrillic ХН73МБТЮ
Designation GOST Latin XH73MBTJu
Transliteration HN73MBTYu
By chemical elements CrNi73CuBeTeAl
Name The value
Designation GOST Cyrillic ЭИ698
Designation GOST Latin EI698
Transliteration EhI698
By chemical elements -

Description

Alloy ХН73МБТЮ used: for the manufacture of parts for aircraft (gas turbine blades, heat-treated and oblicheny forgings of disks, baffles, labyrinths and socks) with operating temperatures up to +750 °C; mounting and other details, operating at temperatures up to 750−800 °C.

Note

High-temperature Nickel-based alloy.

Standards

Name Code Standards
Bars and shapes В32 GOST 22411-77, TU 14-1-1973-77, TU 14-1-2792-79
Blanks. Of the workpiece. Slabs В31 OST 1 90330-82, TU 14-1-1911-76, TU 14-131-665-86, TU 1-809-694-99, TU 1-809-823-99, TU 1-92-187-92
Processing of metals by pressure. Forgings В03 TU 14-1-1466-75, TU 14-1-1530-75, TU 14-1-285-72, TU 14-1-5329-96

Chemical composition

Standard C S P Mn Cr Si Ni Fe As Al B Ti Mo Sn Sb Pb Bi Nb Ce
TU 14-1-2792-79 0.03-0.07 ≤0.007 ≤0.015 ≤0.4 13-16 ≤0.5 Rest ≤2 - 1.45-1.8 ≤0.005 2.37-2.75 2.8-3.2 - - ≤0.001 - 1.9-2.2 ≤0.005
TU 14-1-285-72 0.03-0.07 ≤0.007 ≤0.015 ≤0.4 13-16 ≤0.5 Rest ≤2 ≤0.001 1.45-1.8 ≤0.005 2.35-2.75 2.8-3.2 ≤0.001 ≤0.001 ≤0.001 ≤0.0001 1.9-2.2 ≤0.005
Ni is the basis.
According to TU 14-1-2792-79, the chemical composition is given for the alloy grade KhN73MBTU-VD (EI698-VD). The content of Sb (antimony), Sn (tin), Bi (bismuth), As (arsenic) - no more than 1 point on the scale of spectral analysis. Boron, cerium and other technological additives introduced into the metal by calculation, chemical analysis are not determined. If all the requirements in the finished product are met, deviations from the chemical composition standards are allowed: for carbon ± 0.01%, silicon + 0.1%, niobium + 0.1%, for aluminum -0.05%. The residual content of tungsten is not more than 0.2% is not a rejection sign.
According to TU 14-1-285-72, the chemical composition is given for the alloy grade KhN73MBTU (EI698). Boron, cerium, and other technological additives introduced into the metal by calculation by chemical analysis are not determined. Subject to the requirements of the technical specification, deviations from the chemical composition standards are allowed: by carbon ± 0.010%, silicon + 0.10%, aluminum + 0.10%, titanium + 0.050%, niobium + 0.10%. The content of residual elements is according to GOST 5632.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Forgings on the other 14-1-285-72. The longitudinal samples. Hardening in air, 1100-1120 °C (exposure 8 h) + Annealing in air, 990-1010 °C (exposure 4 h) + Ageing at 775±10°C (aging 16 hours), air cooling
≥706 ≥1128 ≥16 ≥18 ≥390 294-341
≥706 ≥1128 ≥17 ≥19 ≥490 294-341
Forgings on the other 14-1-285-72. The longitudinal samples. Hardening in air, 1100-1120 °C (exposure 8 h) + Annealing in air, 990-1010 °C (exposure 4 h) + Ageing at 775±10°C (aging 16 hours), air cooling + Ageing at 700±10°C (aging 16 hours), air cooling
≥726 ≥1157 ≥14 ≥16 ≥390 302-363
The pressed bars. Quenching with 1100-1120 °With, exposure time 8 hours, air cooling, 1000±10 °With exposure 4 hours, air cooling + Ageing at 775±10°C for 16 hours, air cooling
≥720 ≥1150 ≥17 ≥19 ≥490 294-341
The pressed bars. Quenching with 1100-1120 °With, exposure time 8 hours, air cooling, 1000±10 °With exposure 4 hours, air cooling. Ageing at 775±10°C for 16 hours, air cooling, aging at 700±10°C for 16 hours, air cooling
≥740 ≥1180 ≥14 ≥16 ≥392 302-363
Stamping parts for aircraft (disks, baffles, labyrinths and socks). Hardening in air, 1100-1120 °C (exposure 8 h), air cooling + Tempering air with 990-1010 °C (exposure 4 h), air cooling + Ageing at 765-785 °C for 16 h, air cooling
- ≥675 ≥1100 ≥15 ≥16 ≥392 294-341
- ≥705 ≥1130 ≥17 ≥19 ≥490 294-341
Stamping parts for aircraft (disks, baffles, labyrinths and socks). Hardening in air, 1100-1120 °C (exposure 8 h), air cooling + Tempering air with 990-1010 °C (exposure 4 h), air cooling + Ageing at 765-785 °C for 16 h, air cooling + Ageing at 690-710 °C for 16-24 h, air cooling (or Aging at 740-760 °C for 8-16 h, air cooling)
- ≥705 ≥1130 ≥13 ≥15 ≥343 302-363
- ≥725 ≥1160 ≥14 ≥16 ≥392 302-363
Stamping parts for aircraft (disks, baffles, labyrinths and socks). Anneal at 890-910 °C, (excerpt 10 hours), air cooling + Tempering air with 1030-1050 °C (extract 2-6 h), air cooling + Ageing at 740-760 °C for 16 h, air cooling (or double aging 765-785 °C (exposure 8 h), air cooling + at 740-760 °C (16 h exposure), air cooling)
- ≥705 ≥1130 ≥15 ≥16 ≥392 302-363
- ≥725 ≥1160 ≥17 ≥19 ≥490 302-363

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number