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 sT|s0,2, MPa σU, 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
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

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.