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.
Features and Benefits of using the MasterWeld range of Duplex and Super Duplex Stainless Steel MIG Welding Wires
The nickel content in the MasterWeld range of Super-Duplex MIG Welding wires 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 MIG 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 MIG welding wire grades available are ER2209 , ER2307 & ER2553 & ER2594.
The MasterWeld range of Super Duplex and Duplex stainless steel MIG 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.
Need further technical support? Call us free on 0800 975 9710