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. % Al Max 0.4   C Max 0.1   Co Max 1   Cr 20 - 23   Fe Max 5

Component    Wt. % Mn Max 0.5   Mo 8 - 10   Nb 3.15 - 4.15   Ni Min 58

Component    Wt. % P Max 0.015   S Max 0.015   Si Max 0.5   Ti Max 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 Properties	Metric	English	Comments
Density	8.44 g/cc	0.305 lb/in³
Mechanical Properties
Tensile Strength, Ultimate	880 MPa	128000 psi	Annealed
Tensile Strength, Ultimate at Elevated Temperature	760 MPa	110000 psi	Annealed prior to test; 650°C
Tensile Strength, Yield	460 MPa	66700 psi	Annealed
Tensile Strength, Yield at Elevated Temperature	290 MPa	42100 psi	Annealed prior to test; 650°C
Elongation at Break	50 %	50 %	Annealed prior to test.
Elongation at Break at Elevated Temperature	55 %	55 %	Annealed prior to test.; 650°C
Electrical Properties
Electrical Resistivity	0.000129 ohm-cm	0.000129 ohm-cm
Magnetic Permeability	1.0006	1.0006	at 200 oersted (15.9 kA/m)
Curie Temperature	Max -196 °C	Max -321 °F
Thermal Properties
CTE, linear 20°C	12.8 µm/m-°C	7.11 µin/in-°F	20-100°C
Specific Heat Capacity	0.41 J/g-°C	0.098 BTU/lb-°F
Thermal Conductivity	9.8 W/m-K	68 BTU-in/hr-ft²-°F
Melting Point	1290 - 1350 °C	2350 - 2460 °F
Solidus	1290 °C	2350 °F
Liquidus	1350 °C	2460 °F