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Alloy CrN70VMTUF

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 CrN70VMTYF

Alloy KhN70VMTYF: 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 KhN70VMTYF.

General information on CrN70VMTYF alloy

Application
Heavy-loaded parts operating at the temperature of 850 ° C.

Chemical composition of CrN70VMTYF alloy

Chemical element %
Aluminium (Al) 2.4−2.9
Boron (B), not more 0.015
Vanadium (V) 0.2−1.0
Tungsten (W) 5.0−7.0
Iron (Fe), not more than 5.0
Silicon (Si), not more than 0.6
Manganese (Mn), not more than 0.5
Copper (Cu), not more than 0.02
Molybdenum (Mo) 2.5−4.0
Sulfur (S), not more than 0.009
Titanium (Ti) 1.7−2.2
Carbon ©, not more than 0.12
Phosphorus (P), not more than 0.015
Chrome (Cr) 13.0−16.0

Mechanical properties of CrN70VMTUF alloy

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Hardening at 1210 °C, 2 h, air. Hardening at 1050 °C, 4 h, air. Aging at 800 °C, 16 h, air. [85]
20 710 1030 10 12 20
500 660 960 25 30  
600 660 970 22 28  
700 630 960 12 15  
800 570 830 10 15  
900 390 580 15 20  
950 305 410 18 25  
Tempering: 1180 °C, 6 h, air. Aging in steps: 1000 °C, 8 h, cooling in furnace to 900 °C, holding for 8 h, air. Aging at 850 °C, 16 h, air. [181]
20 580−630 1030−1120 15−22 16−25 29−39
650 500 930 22 28  
700 510−590 930−1030 15−23 13−27 29
750 530 840 20 25  
800 500−560 710−790 12−17 12−25  
850 480 600 13 23  

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Hardening: 1180 °C, 6 h, air. Gradual aging: 1000 °C, 8 h, oven cooled to 900 °C, 8 h, air. Aging at 850 °C, 15 h, air.
Aging at 850 °C, 15h, air. 590 1030 15 16 34 280
Heat soaking 5000 h, 600°C 710 980 12 14 10 290
Heat exposure 10000 h, 700°C 660 1080 10 8 20 295
Heat soaking 1000 h, 800°C 590 1040 17 17 34 280
Heat exposure 10000 h, 800°C 540 950 15 13 26 285
Heat soak 3000 h, 900°C 490 840 17 17 29 240

Mechanical properties as a function of heat soak and test temperature

Heat treatment, delivery condition t test temperature,°C σ0, 2, MPa σB, MPa δ, % ψ, % KCU, J/m2
Hardening: 1180 °C, 6 h, air. Gradual aging: 1000 °C, 8 h, cooling in furnace to 900 °C, holding for 8 h, air. Aging at 850 °C, 15 h, air.
Heat soaking for 5000 h, 600°C 600 660 1010 16 17  
Heat exposure 10000 h, 700°C 700 490 920 17 18 38
Heat soaking 1000 h, 800°C 800 480 710 15 18 73
Heat exposure 10000 h, 800°C 800 420 670 15 17 54
Heat soak 3000 h, 900°C 800 450 710 12 14  

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
490 1/100 700 568−657 100 700
397 1/1000 700 343−362 100 800
274 1/100 800 235−255 100 850
34 5/10000 700 147−176 100 900

Technological properties of CrN70VMTUF alloy

Forging temperature
The beginning 1180, the end 1060. Cooling in the air.
Weldability
hardly weldable.

Endurance limit of KhN70VMTUF alloy

σ-1, MPa n
372 1Е+7
417 1Е+7

Corrosion properties of CrN70VMTUF alloy

Medium Test temperature, °C Test duration, h Depth, mm/year
Air 800 10000 0,003
  850 10000 0,018
  900 10000 0,042

Physical properties of the alloy KhN70VMTYF

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 196         167 162 152 142 127
Thermal conductivity coefficient W/(m — °C) 9 11 13 15 17 19 21 23 26 28
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) 10.3 11.8 12.5 13.0 13.5 13.7 14.0 14.5 15.0