Alloy 625: Chemical Composition, Physical Properties and Product Form

1. General introduction to UNS N06625 (Inconel 625)

Inconel 625, with UNS designation of N06625 and DIN designation of W.Nr. 2.4856, is a nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to siffen the alloy's martix and thereby provide high strength without a strengthening heat treatment. Inconel 625 alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. It is widely used in chemical processing, oil and gas projects, aerospace, marine engineering, pollution control equipment, pulp and paper production and nuclear reactors.

2. Product forms of UNS N06625 (Inconel 625)

Product Form	Designation
Forging(Flange, Fasteners, Fittings)	ASTM B 564
Butt Welding Pipe Fittings	ASTM B 366
Seamless pipe and tube	ASTM B 444, ASTM B 829
Welded pipe	ASTM B 705, ASTM B 775
Welded tube	ASTM B 704, ASTM B 751
Rod and bar	ASTM B 446
Plate, sheet and strip	ASTM B 443, ASTM B 906
Billet and bar for reforging	ASTM B 472

3. Chemical composition requirements of UNS N06625 (Inconel 625)

Element	Content, %
Nickel (Ni)	58.0 min.
Chromium (Cr)	20.0~23.0
Iron (Fe)	5.0 max.
Molybdenum (Mo)	8.0~10.0
Niobium (Nb)	3.15~4.15
Carbon (C)	0.10 max.
Manganese (Mn)	0.50 max.
Silicon (Si)	0.50 max.
Phosphorus (P)	0.015 max.
Sulfur (S)	0.015 max.
Aluminum (Al)	0.40 max.
Titanium (Ti)	0.40 max.
Cobalt (Co)	1.0 max

The mechanical properties of UNS N06625 (Inconel Alloy 625) material vary a lot depending on different conditions and product forms such as Inconel 625 rods and bars, Inconel 625 flanges, inconel 625 sheet, inconel 625 seamless pipes, inconel 625 pipe fittings and weld pipes, etc.

4. Physical properties of UNS N06625 (Inconel 625)

Physical Properties	Designation
Density	8440 kgs/cbm
Melting Range	1290°C ~ 1350°C
Specific Heat(Room Temp.)	410 J/kg°C
Permeability	1.0006

Views: Author：hbmetals Date:15/10/30