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	s_T\|s_0,2, MPa	σ_U, 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number