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