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CrN35VT steel

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

CrN35VT steel

CrN35VT Steel: 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 — Steel KhN35VT.

General information on CrN35VT steel

Application
CrN35VT, discs, rotors, fasteners, flat springs and other parts operating up to 650 °C. A heat resistant nickel based alloy.

Chemical composition of CrN35VT steel

Chemical element %
Tungsten (W) 2.3−3.5
Silicon (Si), not more 0.6
Manganese (Mn) 1.0−2.0
Copper (Cu), not more than 0.25
Molybdenum (Mo), not more than 0.3
Nickel (Ni) 34.0−38.0
Sulfur (S), max. 0.02
Titanium (Ti) 1.1−1.5
Carbon ©, not more than 0.12
Phosphorus (P), not more than 0.03
Chrome (Cr) 14.0−16.0

Mechanical properties of CrN35VT steel

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Tempering at 1080−1100°C with water. Aging at 850 °C, 10 h, air. Aging at 700 °C, 25−50 h, cooling with furnace to 200−300°C.
  <125 390 730 15 35 560 217−269
  <250 390 730 15 25 560 217−269
Tangential samples <250 390 730 13 20 490 217−269

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Bar sections with diameter of 45−90 mm. Hardening at 1090 °C, 1 h in water. Aging at 850 °C, 10 h. Aging at 700 °C, 25−40 h, air or furnace cooled
20 430−620 780−850 18−30 30−55 78−176
200 430−470 720−760 20,5 37−42 137−157
300 430−470 710−740 16−21 30−43 88−157
400 430−470 700−740 19−22 35−45 98−157
500 410−470 670−740 15−23 23−53 88−167
600 390−500 630−710 15−25 30−48 64−137
700 360−440 450−490 9−31 11−48 98−157
Disc forgings with diameter 450−1000 mm, height 180−275 mm. Quenching at 1090 °C, 1 h, water. Aging at 850 °C, 10 h. Aging at 700 °C, 25−40 h, cooling with furnace (tangential samples)
20 390−640 710−980 13−31 14−50 39−167
600 370−470 530−710 10−21 15−42 44−118
650 350−460 490−670 7,5−19 14−37 39−127
Sample diameter 6 mm, length 30 mm, forged. Strain rate of 16 mm/minute. Strain rate 0.009 1/s.
900 180 185 28 49  
1000 98 105 67 90  
1100 56 60 84 96  
1200 30 40 90 96  

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
166 1/10000 650 255−304 10000 600
127−137 1/100000 650 200−255 100000 600
108 1/10000 700 196 10000 650
78 1/100000 700 157 100000 650
      137 10000 700
      98 100000 700

Technological properties of CrN35VT steel

Forging temperature
Beginning 1170, end 850. Cooling in the air.
Weldability
Difficult-to-weld. Welding method — RDS, electrodes KTI-762. Subsequent heat treatment is recommended to remove welding stresses.
machinability by cutting
In the heat-treated state at HB 269 and σB = 951 MPa Kυ dv.spl. = 0,30, Kυ b.st. = 0,15.

Impact toughness of steel CrN35VT

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +650 +200 +100 +20 0 -20 -40 -60 -80 -100
Disc diameter 1000 mm, height 275 mm. Hardening at 1090 C, 1.5 hours with water. Aging at 850 °C, 10 hours. Aging at 700 °C, 20 h. Aging at 660 °C, 30 h. NB 207−228 (Tangential specimens) 78−108 108−118 69−98 69−108 117−147 118−176 127−137 127−157 118−147 137−167

Heat resistance of CrN35VT steel

Medium Temperature,°C Depth, mm/year Resistance group or grade
Air 800 0,038 4
Air 750 0,012 4
Air 650 0,005 3

Physical properties of CrN35VT steel

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 198 195 190 186 179 173 166 158 150  
Alloy density, pn, kg/m3 8164                  
Thermal conductivity coefficient W/(m — °C)   13 16 17 19 21 22 24 26  
Electrical resistivity (p, nominal value — m)   1020 1050 1100 1120 1150 1160 1170    
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) 14.8 15.1 15.5 15.9 16.1 16.6 16.9