Incoloy 25-6HN Introduction

Solid Solution
Strengthened Alloy

Iron

Nickel

Chromium

Molybdenum

Nitrogen

Corrosion
Resistance

73

Mechanical
Behavior

69

Purity

94

Overview

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INCOLOY alloy 25-6HN is a super-austenitic stainless steel containing 6% molybdenum. The alloy’s properties are enhanced by its content of nitrogen. Its high content of nickel results in thermal stability and resistance to stress corrosion cracking. Designated as UNS N08367, alloy 25-6HN directly competes with similar super-austenitic stainless steels. Alloy 25-6HN is a new addition to Special Metals existing line of high performance, super-austenitic stainless steels, INCOLOY alloys 25-6MO and 27-7MO.

Alloy 25-6HN offers significantly improved strength and corrosion resistance in most environments over conventional austenitic stainless steels such as AISI 304 and 316L. Typical applications include welded tubes for heat exchangers for chemical processing and marine applications and for desalination systems, plate and sheet for flue gas desulfurization equipment for coal-fired power plants and plate for reaction vessels for pharmaceutical production.

Corrosion Resistance

INCOLOY alloy 25-6HN offers resistance to many modes of attack in a variety of aggressive environments. It is especially resistant to localized attack (crevice and pitting corrosion) in acid / halide media. Alloy 25-6HN also resists microbially-induced corrosion. With 25% nickel, the alloy is much more resistant to chlorideinduced stress corrosion cracking than austenitic stainless steels (AISI 300 grades).

The values for CPT and CCT of welded alloys are strongly influenced by the choice of filler material. While alloy 25 -6HN is normally joined with INCONEL filler metal 625, higher CPT values can be obtained with the moreresistant INCO-WELD 686CPT filler metal. Annealing after fabrication can also have a positive influence on the corrosion resistance of welded components.

Physical Properties

Mechanical Properties