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Alloy CrN35VTU

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 KhN35VTU

Alloy KhN35VTU: 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 KhN35VTU.

General information on CrN35VTU alloy

Application
Circle KhN35VTU, working blades of gas turbines and other engines operating at temperatures up to 700−800 ° C, compressor blades operating at 700−800 ° C, disks, deflectors, rings operating at temperatures up to 750 ° C. Heat-resistant iron-nickel-based alloy.

Chemical composition of CrN35VTU alloy

Chemical element %
Aluminum (Al) 0.7−1.4
Boron (B), not more 0.02
Tungsten (W) 2.8−3.5
Silicon (Si), not more than 0.6
Manganese (Mn), not more than 0.6
Copper (Cu), not more than 0.25
Molybdenum (Mo), not more than 0.3
Nickel (Ni) 33.0−37.0
Sulfur (S), not more than 0.02
Titanium (Ti) 2.4−3.2
Carbon ©, not more than 0.08
Phosphorus (P), not more 0.03
Chrome (Cr) 14.0−16.0

Mechanical properties of CrN35VTU alloy

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
1180−1200°C, 2.5−8 h, air. 1040−1060°C, 4h, air. 750−800°C, 16h, air. 32−55 640 930 6 8 29

Mechanical properties as a function of test temperature

t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Bar 45−90 mm in diameter. Hardening at 1190 °C, 2.5−8 h, air. Hardening at 1050 °C, 4h, air. 750−800°C, 16h, air.
20 690−900 880−1310 7−22 10−25 24−83
400 690−810 880−1160 11−12 12−16  
500 690−830 880−1130 5−16 6−24  
600 680−810 880−1080 12−14 12−18  
700 690−810 720−950 5−15 8−23 54−59
800 590−690 670−730 13−15 22−28 49−59
850 320−340 350−370 19−21 46−48  
900 200−235 205−345 20−23 50−60  
Bar 45−90 mm in diameter. Quenching at 1150−1160°C, 6−10 h, air. Hardening at 1050 °C, 4 hours, air. Aging at 830 °C, 16 h, air.
20 600−823 1030−1220 11−22 14−29 34−69
550 590−755 980−1030 12−16 17−28 59−64
600 590−755 980 13 26 59
700 590−774 720−900 6−15 10−23 54−59
Bar 45 mm in diameter. Hardened at 1180 °C, 5 h air. Four-step aging: 1000 °C, 4 h; 900 °C, 8 h; 850 °C, 15 h; 740 °C, 20 h, cooling in air.
20 780 1210 16 23 20
400 690 1030 8 14 29
500 630 970 8 18 39
600 660 940 9 24 34
700 590−640 730−780 11−15 18−25 49
800 400 440 23 31  
Disc diameter 540−725 mm, height 115−175 mm. Hardening 1150−1160°C, 6−10 h, air. Aging at 830 °C, 16 h, air (tangential samples)
20 590−710 1090−1170 16−20 19−32 54−73
450   940−1060 12−17 19−29  
550   940−1010 12−16 26−32  
700 590−680 740−810 16−18 22  
750 590−670 660−710 9−15 18−22  
Hardening 1050 °C, 8 hours, air. Aging 750 °C, 16 h, air.
20 710−720 1210−1220 24−32 44 146−165
-20 680 1220−1250 23−30 39−40 148−162
-40 710−750 1270−1300 30−33 44−48 147−185
-60 720−740 1190−1270 30−32 44−48 158
Sample diameter 6 mm, length 30 mm, forged and pressed. Deformation rate 16 mm/minute. Strain rate 0.009 1/s.
800 610 630 7 12  
900 220 220 43 92  
1000 99 105 82 100  
1100 50 55 81 100  
1200 34 37 26 40  

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
1180 °C, 5 h, air. Four-step aging: 1000 °C, 4 h; 900 °C, 8 h; 850 °C, 15 h; 750 °C, 20 h.
Heat soaking for 1000 h, 700°C 740 1090 9 9 34 310
Heat soaking 6000 h, 700°C 660 930 5 5 12 300
Heat soaking 100 h, 750°C 670 1080 10 10 26 300
Heat soaking 6000 h, 750°C 660 850 4 4 12 310
Heat exposure 10000 h, 750°C 550 830 5 6   280

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
245 2/1000 700 539−617 10000 550
176 1/100000 700 412−441 10000 600
127 2/1000 800 216−255 10000 700
98 1/100000 750 155−225 10000 750

Technological properties of CrN35VTU alloy

Forging temperature
The beginning 1110, the end 900. Sections up to 450 mm are cooled in the air.
Weldability
hardly weldable. Welding method — RTD electrodes CТ-22. Following heat treatment is recommended to relieve welding stresses.
machinability by cutting
In the heat-treated condition at HB 340−364 and σB = 930 MPa Kυ dv.spl. = 0,15, Kυ b.st. = 0,10.

Hardness of the alloy CrN35VTU

Delivery condition, heat treatment regime NV
The rod with diameter of 45−90 mm. Hardened at 1190 C, 2.5−8 hours, air. Hardening at 1050 °C, 4hrs, air. 750−800 C aging, 16 h, air. 302−354

Endurance limit of the alloy CrN35VTU

σ-1, MPa n
304 1Е+7
392 1Е+7

Physical properties of the alloy CrN35VTU

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 214 206 198 195 189 181 170 163 148  
Alloy density, pn, kg/m3 8040                  
Thermal conductivity coefficient W/(m — °C) 13 16 18 19 21 23 25 26 28 29
Electrical resistivity (p, nominal value — m) 992                  
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) 12.7 14.1 15.0 15.4 15.8 16.0 16.6 16.8 18.4