Alloy 625, often referred to as Inconel 625 (where Inconel is a trademark of Special Metals Corp) is a nickel-chromium-molybdenum-niobium alloy (NiCr22Mo9Nb).
Alloy 625 is perfectly suited to the most demanding applications, from sub-zero to extremely high-temperature environments. It achieves these levels of high strength as a result of the solid solution effects of molybdenum and niobium (also known as Colombium) from room temperatures up to 800°C. Alloy 625 can be supplied in hot worked and annealed conditions.
Alloy 625 is particularly useful in situations where oxidation resistance and avoidance of pitting are required. In the annealed condition, this Inconel alloy is fully austenitic and suitable for machining. It provides excellent corrosion resistance in a wide variety of severely corrosive environments due to its high alloy content. With nearly 60% nickel composition it is virtually immune from stress corrosion cracking.
Alloy 625 is non-magnetic and able to operate over a wide temperature range, from cryogenic temperatures up to 980degC. This supports applications in jet engines, heat exchangers, furnace hardware and chemical plant equipment.
Langley Alloys can supply this product in a variety of different industry specifications. It is primarily offered as ASTM B446 for applications within the chemical process and Oil and Gas industries.
Langley Alloys carries an extensive stock of Alloy 625 from 0.5″ (12.7mm) to 10″ (254mm) diameter solid bars that meet ASTM B446 Grade 1 and Grade 2 plus SAE AMS 5666 requirements.
The most common specification is Alloy 625 Grade 1, although Langley Alloys are also able to offer Alloy 625 Grade 2 when required. For aerospace-related applications, we can also provide Alloy 625 in compliance with SAE AMS 5666.
|Bars up to and including 4” diameter or section||Bars above 4” diameter or section|
|0.2% Proof Stress||415 N/mm2||60ksi||345 N/mm2||50ksi|
|Tensile Strength||830 N/mm2||120ksi||760 N/mm2||110ksi|
|Elongation, 5.65√S0 and 4D||30%||25%|
|Reduction of Area||35%||35%|
|Magnetic Permeability (20°C)||<1.001|
|Curie Temperature (°C)||-196|
|Young’s Modulus (N/mm2)||207.5|
|Specific Heat, 20°C (J/(g.K))||410|
|Specific Electrical Resistance, 20°C (Ω-m)||0.0129|
|Thermal conductivity, 20°C (W/(m.K))||9.9|
|Mean coefficient of thermal expansion, 20-100°C (/K)||12.8 x 10-6|