Published: Jan 1982
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The austeno-ferritic steels are derived from the classical austenitic steels by increasing the percentage of some α-retaining elements (mainly chromium or molybdenum). Because of their two-phase structure, these steels offer a range of particularly interesting properties.
As far as mechanical characteristics are concerned, the yield strength and tensile strength of austeno-ferritic steels are much higher than those of the austenitic grades. Moreover, the austeno-ferritic steels combine very good processing abilities (molding, casting, welding, machining) with excellent resistance against different kinds of corrosion such as pitting, crack, stress, and intergranular corrosion.
In the production of cast valve and pump bodies the austeno-ferritic stainless steels are particularly suitable where difficult problems of corrosion are to be resolved in handling of sulfuric and phosphoric acids, seawater, natural gas, etc.
stainless steels, castings, corrosion resistance, mechanical characteristics, ferrite content, chemical industry, seawater, natural gas exploration
Ingénieur Civil des Mines, Quality Department, Stainless Steel Foundry, Creusot-Loire, Firminy,