Characteristics AVESTA 309L basic is a highly alloyed low carbon electrode designed for dissimilar welding between stainless and mild or low-alloy steels. The electrode is also well suited as a buffer layer when performing overlay welding on mild steels, providing an 18 Cr 8 Ni deposit from the very first layer. Interpass temperature: Max. 150°C. Heat input: Max. 2.0 kJ/mm. Heat treatment: Generally none. For constructions that include low-alloy steels in mixed joints, a stress-relieving stage may be advisable. However, this type of alloy may be susceptible to embrittlement-inducing participation in the temperature range 550 – 950°C. Always consult the supplier of the parent metal or seek other expert advice to ensure that the correct heat treatment process is carried out. Structure: Austenite with 10 – 15% ferrite. Scaling temperature: Approx. 1000°C (air). Corrosion resistance: Superior to 308L. When surfacing mild steel a corrosion resistance equivalent to that of ASTM 304 is obtained already in the first layer.