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Alloy KhN70VMYUT

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 CrN70VMYUT

Alloy KhN70VMYUT: a classifier 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 KhN70VMYUT.

General information on CrN70VMYUT alloy

Application
Fixtures and other parts operating at temperatures up to 750−800 ° C. Heat resistant nickel-based alloy.

Chemical composition of CrN70VMYUT alloy

Chemical element %
Aluminum (Al) 1.7−2.2
Boron (B), not more 0.01
Tungsten (W) 4.0−6.0
Iron (Fe), not more than 3.9
Silicon (Si), not more than 0.6
Manganese (Mn), not more than 0.5
Copper (Cu), not more than 0.07
Molybdenum (Mo) 3.0−5.0
Sulfur (S), not more than 0.012
Titanium (Ti) 1.0−1.4
Carbon (C) 0.10−0.16
Phosphorus (P), not more than 0.015
Chrome (Cr) 14.0−16.0

Mechanical properties of CrN70VMYuT alloy

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
1150 °C, 3 h, oil. Aging at 800 °C, 20 h, air. 32−55 590 980 20 25 59

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Bar. Hardened at 1150 °C, oil. Aging at 800 °C, 20 h.
20 610−710 1010−1130 28−32 30−34 88
500 630 1000 27 23−34 88
600 590 980 25 18−23 88
700 570−630 870−920 22 27−36 88
800 490−560 560 19 46−52 98
850 390 400−440 21 57 108
900 270 295 31 70  
1000 69 78 58 76−82  
Sample diameter 6 mm, length 30 mm, forged. Deformation rate 16 mm/minute. Strain rate 0.009 1/s.
700 800 910 11 17  
800 700 710 25 60  
900 265 280 55 85  
1000 160 170 60 90  
1100 64 67 68 83  
1200 42 55 44 67  

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
1150 °C, 3 h, oil. Aging at 800 °C, 20 h, air.
Heat soaking 600 h, 3000°C 750−820 1160−1230 24−27 28−34 54−73 277−311
Heat soaking 600 h, 8000°C 840−860 1250−1270 20−23 24−29 42−57 315
Heat soaking 700 h, 1000°C 730 1170 21 33 58 300
Heat soak 700 h, 20,000°C 700 1150 17 19 178 290
Heat soaking 800 h, 1000°C 580−650 890−1120 10−25 21−32 54−69 250−293
Heat soaking 800 h, 8000°C 600−680 1080−1130 28−35 27−42 39−49 270

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, %
Hardening at 1150 °C, 3 hr in oil. Aging at 800 °C, 20 h, air.
Heat soaking 3000 h, 600°C 600 670 1020 24 27
Heat soak 1000 h, 700°C 700 670 1020 19 23
Heat soak 20000 h, 700°C 700 600 930 19 24
Heat soaking 1000 h, 800°C 800 550 760 29 39

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
265 1/10000 700 255 10000 700
108 1/10000 800 88 10000 800
196 1/100000 700 286 100000 700
78 1/100000 800 49 100000 800

Technological properties of CrN70VMYUT alloy

Forging temperature
The beginning 1180, the end 900. Sections up to 220 mm are cooled in the air.
Weldability
difficult to weld. Welding method — RDS. Subsequent heat treatment is recommended to remove welding stresses.
Machinability
In the heat-treated condition at HB 202 and σB = 813 MPa Kυ dv.spl. = 0,2, Kυ b.st. = 0,1.

Endurance limit of alloy CrN70VMYuT

σ-1, MPa n
412 1Е+7

Corrosion properties of CrN70VMYuT alloy

Medium Test temperature,°C Depth, mm/year
Air 700 0,0011
  750 0,0028
  800 0,005−0,01

Heat resistance of the alloy CrN70VMYUT

Medium Temperature,°C Depth, mm/year Resistance group or grade
Air 750 0,001−0,005 2

Physical properties of the alloy CrN70VMYUT

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 221 217 211 205 198 193 186 178    
Torsional shear modulus of elasticity G, GPa 83 82 79 77 74 71 69 66 65  
Alloy density, pn, kg/m3 8600 8570 8540 8510 8470 8430 8390 8340 8290 8240
Thermal conductivity coefficient W/(m — °C)   12 13 17 19 29 30 30    
Electrical resistivity (p, nominal value — m) 1330 1340 1350 1360 1360 1370 1470 1480    
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) 12.2 12.6 13.2 13.6 14.1 14.5 15.1 15.8 16.5