Saturday 17 April 2010

Duplex valve for petrochemical applications

Duplex valve for corrosive, seawater application

Duplex is an austenitic ferritic Iron Chromium-Nickel alloy with Molybdenim addition. It has good resitance to pitting, a high tensile strength and higher resistance to stress corrosion cracking at moderate temperatures to that of conventional austenitic stainless steels.
Duplex is a material having an approximate equal amount of austenite and ferrite. These combine excellent corrosion resistance with high strength. Mechanical properties are approximately double those of singular austenitic steel and resistance to stress corrosion cracking is superior to type 316 stainless steel in chloride solutions.

Duplex material has a ductile / brittle transition at approximately -50°C. High temperature use is usually restricted to a maximum temperature of 300°C for indefinite use due to embrittlement

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