Langley Alloys: Stock Nickel-based Alloy 625

The outstanding corrosion resistance of Alloy 625 under a wide range of temperatures and pressures is a primary reason for its wide acceptance in the chemical processing industry. 

Sometimes referred to by the tradename Inconel® 625 (special Metal Inc) and the universal designation UNS N06625, it is specified by us to meet the stringent requirements of Norsok M630 Ed. 5 and NACE MR01-75 / ISO 15156-3. 

This is a nickel-chromium-molybdenum solid solution strengthened alloy with a minimum chemical composition of 58% nickel, 20% chromium, and 8% molybdenum. 

Applications

Alloy 625 is used in a variety of industries, including valves, marine, aerospace, oil and gas, chemical processing and nuclear. Typical end use applications may include:

• valves
• heat exchangers,
• expansion joints,
• exhaust systems,
• fasteners,
• quick connect fittings
• marine engineering
• oil & gas components such as wellheads
• downhole equipment for sour service
• chemical processing and
• pollution control equipment
• particularly suitable for sea-water applications 

High Strength

The strength of Alloy 625 is derived from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix. The molybdenum distorts the alloy’s atomic matrix, giving particularly high strength in the annealed condition without any strengthening heat treatment required, and it also achieves good fatigue strength. 

Excellent corrosion resistance

There is almost no attack in mild environments, such as freshwater or seawater, neutral pH environments, and alkaline media, due to the alloy’s increased chromium content. The high molybdenum content makes Alloy 625 very resistant to pitting and crevice corrosion. 

Resistance to high temperature oxidation

The increased nickel content of this alloy results in superior resistance to oxidizing environments and scaling at high temperatures. Over 900°C, scaling resistance becomes a significant factor in service in environments subject to high temperatures and cyclic heating and cooling conditions. 

Because of its low carbon, it is easily fabricated, allowing it to be readily made into a variety of components for process plant equipment.

For more information on alloy 625 sourced from the world best producing mills, please refer to our website: Alloy 625 l (AMS5666) | Inconel 625 | Langley Alloys Ltd or contact our sales office on:

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