Duplex & Super Duplex Stainless Steel TIG Welding Rods
Why are Duplex and Super Duplex stainless steel alloys used in Industry
A relatively modern group of stainless engineering steels is the Duplex series of alloys. These material consist of approximately 50:50 austenite and ferrite phases in the matrix, hence their descriptive dual-phase name.
The dual phase microstructure is achieved by using lower nickel content in the range 1.5 to around 6 wt % but maintaining chromium content in the 21-25 wt % range .Nitrogen is typically 0.2wt % (0.1-0.3 wt % ) and there are minor additions of other useful elements including molybdenum. Carbon content is typically <0.03wt % in order to minimise loss of chromium through the formation of chromium carbide precipitates, especially along grain boundaries under various temperature cycles.
Featues and Benefits of using the MasterWeld range of Duplex and Super Duplex Stainless Steel TIG Welding Rods
The nickel content in the MasterWeld range of Super-Duplex TIG welding rods are held at a higher level than the equivalent base alloy in order to control the ferrite level balance within the weld deposit.
Consequently these Duplex and Super Duplex TIG Welding Wires have high tensile strength and corrosion resistance which offsets stress corrosion cracking and pitting corrosion. The alloys in the category have high value PREN numbers (pitting resistance).
The full range of Duplex and Super Duplex stainless steel TIG welding wire grades available are ER2209 , ER2307 & ER2553 & ER2594.
The MasterWeld range of Super Duplex and Duplex stainless steel TIG welding wires offer excellent weldability due carefully selected procedures for maximum corrosion resistant properties, so the stress corrosion cracking and pitting corrosion susceptibility is nullified.
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