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), supplied in the hot worked and annealed condition. Perfectly suited to the most demanding applications, it achieves high-strength levels from the solid solution effects of Molybdenum and Niobium (Colombium) from room temperature up to 800°C.
It is particularly useful in situations where oxidation resistance and avoidance of pitting is required. In the annealed condition, it is fully austenitic and is suitable for machining. It provides excellent corrosion resistance in a wide variety of severe 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. 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.
Langley Alloys carries an extensive stock of Alloy 625 from 0.5″ (12.7mm) to 10″ (254mm) diameter solid bars that meets ASTM B446 Grade 1 and Grade 2 plus SAE AMS 5666 requirements.
|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|