overview

AL-6XN (UNS N08367) is a 6% molybdenum, low carbon, nitrogen-bearing super-austenitic stainless alloy. The alloy was designed to be a seawater resistant material and has been found to be resistant to a broad range of corrosive environments.

AL6XN has high nickel (24%), molybdenum (6.3%), nitrogen and chromium contents that give it excellent resistance to chloride stress corrosion cracking, chloride pitting, and exceptional general corrosion resistance.

AL6XN is primarily used for its improved pitting and crevice corrosion resistance in chlorides. It is a formable and weldable stainless steel.

Because of its nitrogen content, AL6XN has greater tensile strength than common austentitic stainlesses, while retaining high ductility and impact strength.

Due to the alloy’s corrosion resistance and high strength, AL-6XN is a better choice than conventional duplex stainless alloy and more cost effective nickel-base alloys.

Limiting Chemical Composition, %

Nickel....................................................................................................................................................................................................................23.5-25.5

Chromium.........................................................................................................................................................................................................20.00-22.00

Molybdenum.........................................................................................................................................................................................................6.00-7.00

Carbon...................................................................................................................................................................................................................0.03 max.

Nitrogen.................................................................................................................................................................................................................0.18-0.25

Manganese............................................................................................................................................................................................................2.00 max.

Silicon.....................................................................................................................................................................................................................1.00 max.

Phosphorus............................................................................................................................................................................................................0.40 max.

Sulphur....................................................................................................................................................................................................................0.03 max.

Copper.....................................................................................................................................................................................................................0.75 max.

Iron............................................................................................................................................................................................................................Balance

Physical Constants

Below are some physical constants and thermal properties of

Mechanical properties

Tensile-properties

Corrosion Resistance

Corrosion in the forms of pitting, crevice, and stress corrosion cracking in 304 and 316 stainless steels are often better managed with AL-6XN alloy. This alloy is resistant to corrosion from various acids, salt solutions (sodium chloride) in hot and cold environments.

Heat Treatment

If necessary, AL-6XN alloy is annealed after heavy cold work 2050-2150°F (1121-1177C), water quench. Slow cooling is not recommended, as this would reduce the alloy’s corrosion resistance.

WELDING

All methods except oxyacetylene welding have been successfully used with this alloy. While a filler metal of type 316 stainless may be sufficient for some applications, it is preferable to employ a higher alloy such as 625, or C-276 for maximum performance.

What are the characteristics of AL-6XN?

· Excellent resistance to pitting and crevice corrosion in chloride solutions

· Practical immunity to stress corrosion in NaCl environments

· High Strength and toughness

Available Forms

We provide you with a variety of product forms, including but not limited to

● Bar & Rod

● Pipe & Tube

● Coil & Strip

● Plate & Sheet & Circle

● Wire & Welding

● Fitting (Flange, Elbow, Tee...)

● Customize