What is the thermal conductivity of INCOLOY 825?
Alloy 825, 2.4858, UNS N08825, Incoloy 825 – Description
Alloy 825 (N08825) is an alloy in the Ni-Cr-Fe-Mo family, developed in the 1950s. It contains 42% Ni, 32% Fe, 22% Cr, 2.5% Mo, and 2% Cu, and is stabilized with 0.8% Ti, which gives it excellent resistance to sulfuric and phosphoric acids.
The alloy resists a wide range of corrosive environments and intergranular sensitization. It resists oxidizing and reducing acids, stress corrosion cracking, pitting, and intergranular corrosion and is used in chemical and petrochemical processing, oil and gas extraction, pollution control, waste treatment, and pickling applications
Applications
825 alloy is used in phosphoric acid evaporators, pickling equipment, chemical processing vessels and piping, spent nuclear fuel recovery equipment, propeller shafts, tank cars
N08825 - Physical and Mechanical Properties
Physical properties at room temperature:
Density: 8.14 g/cm3
Coefficient of linear expansion: 14.0 *10-6m/(m*K)
Thermal conductivity: 11.1 W/(m*K)
Specific heat: 440 J/(kg*K)
Young's modulus: 195 GPa
Resistivity: 1127 μΩ*m
Magnetic permeability: 1.005
Curie temperature: -196 °C
Meltdown temperature: 1370-1400 °C
Mechanical properties of annealed Incoloy 825 rods:
Yield strength: 324 MPa
Tensile strength Rm: 690 MPa
Elongation: 45 %
Hardness: 90 HRB
Annealed impact energy KV 825 alloy plate, temperature dependence:
Impact energy KV 20°C: 107-113 J
Impact energy KV -79°C: 106 J
Impact Energy KV -196°C: 91-97 J
Impact Energy KV -253°C: 92 J
Tensile Strength vs. Temperature:
At ambient temperature: 693 MPa
93°C: 655 MPa
204°C: 637 MPa
316°C: 632 MPa
371°C: 621 MPa
427°C: 610 MPa
482°C: 608 MPa
538°C: 592 MPa
593°C: 541 MPa
649°C: 465 MPa
760°C: 274 MPa
871°C: 135 MPa
982°C: 75 MPa
1093°C: 42 MPa
Yield Strength vs. Temperature:
At ambient temperature: 301 MPa
93°C: 279 MPa
204°C: 245 MPa
316°C: 232 MPa
371°C: 234 MPa
427°C: 228 MPa
482°C: 221 MPa
538°C: 229 MPa
593°C: 222 MPa
649°C: 213 MPa
760°C: 183 MPa
871°C: 117 MPa
982°C: 47 MPa
1093°C: 23 MPa
Elongation and temperature:
At ambient temperature: 43 %
538°C: 43 %
593°C: 38 %
649°C: 62 %
760°C: 87 %
871°C: 102 %
Coefficient of thermal expansion and temperature (linear):
24-93°C: 14.0 μm/(m*K)
24-205°C: 14.9 μm/(m*K)
24-315°C: 15.3 μm/(m*K)
24-425°C: 15.7 μm/(m*K)
24-540°C: 15.8 μm/(m*K)
24-650°C: 16.4 μm/(m*K)
24-760°C: 17.1 μm/(m*K)
24-870°C: 17.5 μm/(m*K)
Thermal conductivity and temperature:
At ambient temperature: 11.1 W/(m*K)
93°C: 12.3 W/(m*K)
205°C: 14.1 W/(m*K)
315°C: 15.8 W/(m*K)
425°C: 17.3 W/(m*K)
540°C: 18.9 W/(m*K)
650°C: 20.2 W/(m*K)
760°C: 22.3 W/(m*K)
870°C: 24.8 W/(m*K)
980°C: 27.7 W/(m*K)
Resistivity and temperature:
At ambient temperature: 1127 μΩ*m
93°C: 1142 μΩ*m
205°C: 1180 μΩ*m
315°C: 1210 μΩ*m
425°C: 1248 μΩ*m
540°C: 1265 μΩ*m
650°C: 1267 μΩ*m
760°C: 1272 μΩ*m
870°C: 1288 μΩ*m
980°C: 1300 μΩ*m
