Alloy 625

Nickel-chromium alloy 625 (UNS N06625 / W. Nr. 2.4856 / GH3625 / NS336) is used for its high strength, excellent fabricability (including joining), and outstanding corrosion resistance.  Service temperatures range from cryogenic to 1800°F (982°C). Composition is shown as follows:

Limiting Chemical Composition, %

Nickel: 58.0 min.

Chromium: 20.0-23.0

Iron: 5.0 max.

Molybdenum: 8.0-10.0

Niobium (plus Tantalum): 3.15-4.15

Carbon: 0.10 max.

Manganese: 0.50 max.

Silicon: 0.50 max.

Phosphorus: 0.015 max.

Sulfur: 0.015 max.

Aluminum: 0.40 max.

Titanium: 0.40 max.

Cobalt: 1.0 max.