Basic pipe-welding electrode for 22%Cr duplex. MMA electrode made on duplex stainless core wire with a special basic flux to give optimum all-positional operability. Recovery is about 120% with respect to the core wire, 65% with respect to the whole electrode. The electrode has a basic flux system and is recommended where the highest sub-zero toughness is required and for the most demanding positional welding applications such as fixed pipework in the ASME 6G position.
Applications
Duplex stainless steel pipe, plate, fittings and forgings have an approximate 50:50 microstructure of austenite with a ferrite matrix. This, coupled with the general alloying level, confers:
- High strength compared with standard austenitic steels, eg type 316L
- Good general corrosion resistance in a range of environments
- High resistance to chloride-induced stress corrosion cracking (CSCC)
- High resistance to pitting attack in chloride environments, eg seawater. These alloys are finding widening application in the offshore oil/gas, chemical and petrochemical process industries, eg pipework systems, flowlines, risers, manifolds etc
Specification
AWS A5.4: E2209-15
BS EN 1600: E 22 9 3 N L B 4 2