INCONEL alloy 693 is a new alloy from Special Metals which offers resistance to high temperature corrosion mechanisms not previously available from a nickel-based alloy. Of particular interest to the designer is the alloy’s resistance to metal dusting. INCONEL® alloy 693 offers the best resistance to metal dusting in chemical and petrochemical processing environments of any conventional alloy currently manufactured. Alloy 693 typically contains 60.5% nickel, 29% chromium, and 3.1% aluminum. Like its predecessor, INCONEL alloy 690, the alloy’s high chromium content gives it excellent resistance to oxidation and sulfidation. However, the addition of 3.1% aluminum to alloy 693 vastly improves resistance to other forms of high temperature corrosion as well. Alloy 693 is protected by U.S. Patent Number 4,882,125.

UNS: N06693
W.Nr.: n/a

Technical Bulletin (PDF, 170KB)

Available Product Forms: Contact Special Metals.

Technical Papers
A New Nickel-Base Alloy for Resisting Metal Dusting Attack (PDF, 134KB)

Alloy Solutions to Metal Dusting Problems in the Petrochemical Industry (PDF, 1.6MB)

Metal Dusting in a Laboratory Environment – Alloying Addition Effects (PDF, 218KB)

Nickel Base Alloy Solutions to Metal Dusting Problems (PDF, 166KB)

The Role of Protective Scales in Enhancing Oxidation Resistance (PDF, 2.34MB)

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