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Alloy KhN77TUR

X27YU5T CRN70VMTUF CHN78T CRN70VMYUT CHN80TBU CRN35VT CHN70U CRN35VTU CHN77TUR 20X23H18 31Х19Н9МВБТ 40Х13 20Х13 20X25H20C2 40Х15Н7Г7Ф2МС 10X23H18 12Х25Н16Г7АР 15X12VNMF 20Х20Н14С2 37X12H8G8MFB 40X9C2 20X23H13 30Х13 40CR10CR2M 45Х14Н14В2М 13Х11Н2В2МФ

Alloy KhN77TUR

Alloy KhN77TYR: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the grade — Alloy KhN77TTUR.

General information on CrN77TYR alloy

Delivery type
CrN77TUR wire, bar stock, including shaped: TU 14−1-402−72, TU 14−1-75−71, TU 14−1-223−73. calibrated bar TU 14−1-2480−78. Thin plate TU 14−1-1747−76. Ribbon TU. 14−1-927−74. Forgings and forgings TU 14−1-1214−75, TU 14−1-1465−75, TU 14−1-1530−75. TU tubes. 14−1-895−74.
Application
Disks, rings, blades and other parts that operate up to 750 ° C. Heat resistant nickel-based alloy.

Chemical composition of the alloy KhN77TYR

Chemical element %
Aluminum (Al) 0.6−1.0
Boron (B), not more 0.01
Iron (Fe), not more than 1.0
Silicon (Si), not more than 0.6
Manganese (Mn), not more than 0.40
Copper (Cu), not more than 0.07
Mercury (Pb), not more than 0.01
Sulfur (S), max. 0.007
Titanium (Ti) 2.4−2.8
Carbon ©, not more than 0.07
Phosphorus (P), not more than 0.015
Chrome (Cr) 19.0−22.0
Cerium (Ce), not more than 0.02

Mechanical properties of CrN77TUR alloy

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ, % δ10, % KCU, J/m2
Bar. Tempering at 1080 °C, 8 h, air. 315 730   43 265
Bar. Tempering at 1080 °C, 8 h, air. Aging at 700 °C, 16 h. 730 1080   32 137
Sheet. Tempering at 1080 °C, 3 min, air. 350 730−780   50  
Sheet. Tempering at 1080 °C, 3 min, air. Aging at 750 °C, 5 h.   1080   30 118
Tempering at 1080 °C, 8 hours, air. Aging 700 °C, 16 h, air. 640 980 20   49

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Tempering at 1080 °C, air. Aging at 750 °C, 16 h.
20 650 900−1070 11−24 10−21 29−49
500 570 880 22−29 19−27 49−69
600 540 860 30−33 30−32 49−59
700 520 820 25−29 27−32 49
800 460 520 15−16 25−30 88
Sample diameter 5 mm, length 25 mm, forged and normalized. Strain rate 1.1 mm/minute. Strain rate 0.0007 1/s.
800   600 24 23  
900   380 26 28  
1000   110 80 95  
1100   48 153 100  
1200   34 134 100  

Mechanical properties at 20 C, depending on heat treatment

Heat treatment, delivery condition σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Tempering at 1080 °C, 8 h, air. Aging at 750 °C, 16 h, air.
Without tempering 650 900−1070 11−24 10−21 27−45 269−285
Heat soaking 1000 h, 600°C 750 900 6−7 5−10 12−14 295−302
Heat soaking 5000 h, 600°C 770 900 3−4 5−7 15 295−313
Heat soaking 1000 h, 650°C 750 1060 13−17 12−19 12−15 285
Heat soaking 5000 h, 650°C 760 1140 17−21 19−21 30−34 302
Heat soaking 1000 h, 700°C 730 1080 15−24 14−23 24−38 285−295
Heat soaking 5000 h, 700°C 670 1180 20−23 19−25 40−51 285−302
Heat soaking 5000 h, 750°C 490 1000 28−30 32−34 72−77 263−269

Mechanical properties as a function of heat soak and test temperature

Heat treatment, delivery condition t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Hardening at 1080 °C, 8 h, air. 750 °C, 16 h, air.
Heat soaking 1000 h, 600°C 600 670 930 23−25 21−28 26−29
Heat soaking 5000 h, 600°C 600 670 870 11−12 12−16  
Heat soaking 1000 h, 650°C 650 660 960 21−23 21−25 35−38
Heat soaking 5000 h, 650°C 650 650 930 12−18 14−19 54−56
Heat soaking 1000 h, 700°C 700 610 800 18 21 98
Heat soaking 5000 h, 700°C 700 520−590 700−810 15−23 14−30 69
Heat soaking 5000 h, 750°C 750 420 500 9−11 12−14 83

Mechanical properties in the long term strength test

Creep strength, MPa Creep rate, %/h t test,°C Ultimate long-term strength, MPa Test duration, h t test, h
333 1/10000 650 441 10000 600
451 1/1000 650 176−196 10000 700
196 1/1000 750 549 1000 600
147 1/1000 800 304 1000 700

Technological properties of CrN77TUR alloy

Forging temperature
The beginning 1180, the end 900. Sections up to 300 mm are air-cooled.
Weldability
difficult to weld. The method of welding is RDS.
Machinability by cutting
In the heat-treated condition at HB 262 and σB = 1060 MPa Kυ dv.spl. = 0,20, Kυ b.st. = 0,08.

Endurance limit of the alloy KhN77TUR

σ-1, MPa n
363 1Е+7

Physical properties of the alloy KhN77TYR

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 196           157 147 128  
Alloy density, pn, kg/m3 8200 8180 8140 8110 8070 8040 8000 7960 7920 7870
Thermal conductivity coefficient W/(m — °C) 13 14 16 17 19 21 24 25 28 31
Electrical resistivity (p, nominal value — m)   1247 1262 1282 1300 1308 1288 1272 1253 1232
Test temperature,°C 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Coefficient of linear expansion (a, 10−6 1/°C) 11.9 12.7 13.0 13.5 13.7 14.0 14.5 15.1 15.8