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Alloy KhN80TBU

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 CrN80TBU

Alloy KhN80TBU: Handbook of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperature, physical, mechanical, technological and foundry properties for the grade — Alloy KhN80TBYu.

General information on CrN80TBU alloy

Application
Fasteners operating up to 700 °C.

Chemical composition of the alloy CrN80TBU

Chemical element %
Aluminum (Al) 0.5−1.0
Iron (Fe), not more 3.0
Silicon (Si), max. 0.8
Manganese (Mn), not more than 1.0
Copper (Cu), not more than 0.07
Niobium (Nb) 1.0−1.5
Sulfur (S), not more than 0.012
Titanium (Ti) 1.8−2.3
Carbon ©, not more than 0.08
Phosphorus (P), not more than 0.015
Chrome (Cr) 15.0−18.0

Mechanical properties of CrNi80Tbyu alloy

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Hardening: 1100 °C, 5 h, air. Gradual aging: 1000 °C, 2 h, cooling with furnace to 900 °C, 1 h, cooling with furnace to 800 °C, 2 h, cooling in air
20 640 1030 24−30 28−35 98
500 600 980 26 26  
600 590 810 11    
650 540 690−730 7−12 10−15 98
700 490 670 7 6 118
Sample diameter 6 mm, length 30 mm, pressed hardened and aged. Strain rate of 16 mm/minute. Strain rate 0.009 1/s.
900   570   97  
950   410 77 96  
1000   295 78 96  
1100   165 84 98  
1150   120 100 100  

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Hardening at 1100 °C, 5h, air. Staged aging: 1000 °C, 2 h, cooling with furnace to 900 °C, 1 h, cooling with furnace to 800 °C, 2 h, air. Aging at 750 °C, 20 h, air. Aging at 650 °C, 48 h, air.
Without aging 640 930 18 22 69 217−255
Heat soaking 4000 h, 500°C 770 1180 22 29 73  
Heat soaking 4000 h, 600°C 800 1200 19 23 49  
Heat soak 10000 h, 700°C 440 920 33 42 108  
Heat soak 20000 h, 700°C 440 920 24 32 59  

Mechanical properties depending on heat treatment and test temperature

Heat treatment, delivery condition t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, %
Hardening at 1100 °C for 5 hours in air. Gradual aging: 1000 °C, 2 h, cooling with furnace to 900 °C, 1 h, cooling with furnace to 800 °C, 2 h, air. Aging at 750 °C, 20 h, air. Aging at 650 °C, 48 h, air.
Heat soaking 4000 h, 500 °C 500 690 1050 21 31
Heat soak 4000 h, 600°C 600 560 850 5 13
Heat exposure 10000 h, 700°C 700 360 590 16 18
Heat soak 20000 h, 700°C 700 320 570 16 20

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
348 1/10000 650 441 1000 650
216 1/10000 700 274 1000 700
255 1/100000 650 274 10000 650
147 1/100000 700 167 10000 700

Technological properties of CrN80TBU alloy

Forging temperature
Beginning 1180, end 900. Cooling in the air.
Weldability
hardly weldable. Welding method — RDS.
Machinability
In the heat-treated condition at HB 165 and σB = 730 MPa Kυ dv.spl. = 0,20, Kυ b.m. = 0,15.

Heat resistance of the alloy CrN80Tbyu

Medium Temperature, °С Test duration, h Depth, mm/year Resistance group or grade
Air 700 10000 0,001 1
Air 800   0,007 3
Air 850   0,013 4

Physical properties of the alloy KhN80TBU

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 220 217 211 206 200 193 184 174    
Alloy density, pn, kg/m3 8300     8210 8170 8130 8090 8040 7990  
Thermal conductivity coefficient W/(m — °C)   13 16 18 20 22 24 26 29  
Electrical resistivity (p, nominal value — m)   1170 1180 1190 1200 1220 1230 1240    
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) 13.3 13.5 13.8 14.2 14.5 14.9 15.5 16.2 16.7 17.2