Stainless alloys for enhanced corrosion resistance

Details Stainless alloys for enhanced corrosion resistance Stainless alloys for enhanced corrosion resistance

C - Chemistry, Metallurgy

22

C

C22C 38/40 (2006.01) C22C 38/02 (2006.01) C22C 38/42 (2006.01)

Patent

CA 2346087

An improved stainless alloy has application in handling concentrated sulfuric acid. The alloy of the invention preferably comprises 23 to 33% chromium, more than 20% nickel, 6% or more of silicon, 0.2% to 0.4% nitrogen and minor amounts of molybdenum, copper, and tungsten with the balance iron. The alloy offers superior corrosion resistance by comparison with the standard stainless steels over the range from 90% sulfuric acid into the oleum range. The alloy is readily weldable and may be used in either cast or wrought form. After heat treating the alloy acquires a duplex structure which has a mixture of austenite and ferrite phases. The heat-treated alloy is ductile.

Alliage inoxydable amélioré pouvant être utilisé pour la manipulation de l'acide sulfurique concentré. L'alliage de l'invention comprend de préférence 23 à 33 % de chrome, plus de 20 % de nickel; 6 % ou davantage de silicium; 0,2 à 0,4 % d'azote et des quantités mineures de molybdène, de cuivre et de tungstène, le solde étant constitué de fer. Il présente une meilleure résistance à la corrosion que les aciers inoxydables standards pour la plage allant de 90 % d'acide sulfurique à la plage de l'oléum. Il peut être soudé directement et utilisé sous sa forme coulée ou corroyée. Après traitement thermique, il prend une structure duplex constituée d'un mélange de phases austénite et ferrite. L'alliage traité thermiquement est ductile.

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