Special Metals INCONEL Alloy 625

Subcategory: Metal; Nickel Base; Superalloy

Key Words: ASME SB-443, SB-444, SB-446, SB-564, Boiler Code Sections I, III, VIII, IX; AFNOR NC 22 D Nb; VdTUV 499, AMS 5581, AMS 5599, AMS 5666, AMS 5837; DIN 17744, 17750-17752, 17754; Werkstoff Nr. 2.4856; NACE MR-01-75, UNS N06625; BS 3072, 3074, 3076 (NA21); ASTM B443, ASTM B444, ASTM B446, ASTM B564, ASTM B704, ASTM B705, ASTM B751

Component   Wt. %
AlMax 0.4 
CMax 0.1 
CoMax 1 
Cr20 - 23 
FeMax 5 
Component   Wt. %
MnMax 0.5 
Mo8 - 10 
Nb3.15 - 4.15 
NiMin 58 
Component   Wt. %
PMax 0.015 
SMax 0.015 
SiMax 0.5 
TiMax 0.4 

Material Notes:
Niobium content above includes tantalum. A nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy's matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors. Standard product forms are round, flats, forging stock, extruded section, pipe, tube, plate, sheet, strip, and wire.

Data provided by the manufacturer, Special Metals.

Physical PropertiesMetricEnglishComments
Density8.44 g/cc0.305 lb/in 

Mechanical Properties
Tensile Strength, Ultimate880 MPa128000 psi Annealed
Tensile Strength, Ultimate at Elevated Temperature760 MPa110000 psi Annealed prior to test; 650C
Tensile Strength, Yield460 MPa66700 psi Annealed
Tensile Strength, Yield at Elevated Temperature290 MPa42100 psi Annealed prior to test; 650C
Elongation at Break50 %50 % Annealed prior to test.
Elongation at Break at Elevated Temperature55 %55 % Annealed prior to test.; 650C

Electrical Properties
Electrical Resistivity0.000129 ohm-cm0.000129 ohm-cm 
Magnetic Permeability1.00061.0006 at 200 oersted (15.9 kA/m)
Curie TemperatureMax -196 CMax -321 F 

Thermal Properties
CTE, linear 20C12.8 m/m-C7.11 in/in-F 20-100C
Specific Heat Capacity0.41 J/g-C0.098 BTU/lb-F 
Thermal Conductivity9.8 W/m-K68 BTU-in/hr-ft-F 
Melting Point1290 - 1350 C2350 - 2460 F 
Solidus1290 C2350 F 
Liquidus1350 C2460 F 

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