ER 2594 is a super duplex welding wire. Super Duplex Steel ER 2594 Filler wire provides matching chemistry and mechanical property characteristics to wrought super duplex alloys such as 2507 and Zeron 100 as well as super duplex casting alloys (ASTM A890). Super Duplex Steel ER 2594 welding wire is over alloyed 2-3 per cent in Nickel to provide optimum ferrite/austenite ratio in the finished weld. This structure results in high tensile and yield strength along with superior resistance to SCC and pitting corrosion.
The welding wire is over-alloyed with nickel compared to the base material to ensure the optimum combination of microstructure, mechanical properties and corrosion resistance. The wire has additions of Cu and W which provides enhanced corrosion resistance to sulphuric and hydrochloric acids.
The super duplex stainless steel base materials have a microstructure consisting of nominally 50% austenite in a ferrite matrix. Normal service temperature range is -50 deg