Alloy KHN70VMJUT (ЭИ765)

Designation

Name	The value
Designation GOST Cyrillic	ХН70ВМЮТ
Designation GOST Latin	XH70BMJuT
Transliteration	HN70VMYuT
By chemical elements	CrNi70ВCuAlTe

Name	The value
Designation GOST Cyrillic	ЭИ765
Designation GOST Latin	EI765
Transliteration	EhI765
By chemical elements	-

Description

Alloy KHN70VMJUT used: for the manufacture of turbine blades, fasteners and other parts operating at temperatures up to 750−800 °C.

Note

High-temperature Nickel-based alloy.
The recommended maximum operating temperature for a very long time +750 °C, long-time +800 °C.
The temperature of beginning of intensive scaling in air to +1000 °C.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В30	GOST 5632-72
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90
Processing of metals by pressure. Forgings	В03	ST ЦКБА 010-2004
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 016-2005
Bars and shapes	В32	TU 14-1-1358-74, TU 14-11-245-88

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	B	Ti	Mo	W
GOST 5632-72	0.1-0.16	≤0.012	≤0.015	≤0.5	14-16	≤0.6	Rest	≤3	≤0.3	1.7-2.2	≤0.01	1-1.4	3-5	4-6

Ni is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Blank pieces of pipe fittings and welded assemblies at ST CKBA 016-2005. Quenching in oil with 1140-1160 °C (extract 3 hours) + Aging at 790-810 °C (20 h exposure), air cooling
≤100	≥588	≥980	≥20	≥25	≥588	270-320
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥800	≥910	≥11	≥17	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	750-820	1160-1230	24-27	28-34	-	277-311
-	≥670	≥1020	≥24	≥27	-	-
Long products (bar) in the delivery condition. Quenching in oil from 1150 °C + Ageing at 800 °C (20 h exposure)
≤30	≥670	≥1030	≥28	≥26	≥785	-
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥700	≥710	≥25	≥60	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	840-860	1250-1270	20-23	24-29	-	315
-	≥670	≥1020	≥19	≥23	-	-
Long products (bar) in the delivery condition. Quenching in oil from 1150 °C + Ageing at 800 °C (20 h exposure)
32-55	≥590	≥980	≥20	≥25	≥579	-
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥265	≥280	≥55	≥85	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	730	1170	21	33	-	300
-	≥600	≥930	≥19	≥24	-	-
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥160	≥170	≥60	≥90	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	700	1150	17	19	-	290
-	≥550	≥760	≥29	≥39	-	-
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥64	≥67	≥68	≥83	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	580-650	890-1120	10-25	21-32	-	250-293
A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥42	≥55	≥44	≥67	-	-
Annealing: heat to 1150 °C, exposure 3 h, cooling in oil + ageing at 800 °C (20 h exposure), cooling air (indicated by temperature and duration of heat exposure)
-	600-680	1080-1130	28-35	27-42	-	270
Rod. Quenching in oil from 1150 °C + ageing at 800 °C (20 h exposure)
-	610-710	1010-1130	28-32	30-34	-	-
-	≥630	≥1000	≥27	23-34	-	-
-	≥590	≥980	≥25	18-23	-	-
-	570-630	870-920	≥22	27-36	-	-
-	490-560	≥560	≥19	46-52	-	-
-	≥390	400-440	≥21	57	-	-
-	≥270	≥295	≥31	70	-	-
-	≥69	≥78	≥58	76-82	-	-

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

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
0	221	83	8600	-	1330	-
20	226	-	8600	-	1330	-
100	217	82	8570	12	1340	122
200	211	79	8540	13	1350	126
300	205	77	8510	17	1360	132
400	198	74	8470	19	1360	136
500	193	71	8430	29	1370	141
600	186	69	8390	30	1470	145
700	178	66	8340	30	1480	151
800	-	65	8290	-	-	158
900	-	-	8240	-	-	158
1100	-	-	-	-	-	165

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	Trudnosmyvaemye alloy. The welding process - SMAW. To relieve welding stresses, the recommended subsequent heat treatment.
The temperature of forging	Start - 1180 °C, the end of - 900 °C. the cross Section up to 220 mm are cooled in air.
Machinability	In the heat treated condition while HB 202 and blower SB=813 MPa Kn TV.SPL.=0,2 Kn b.St.=0,1.