309Mo Stainless steel sub-arc wire.
Applications
There are three main areas of application - Buffer layers and clad steels, Overlays on CMn, mild steel or low alloy steels and for joining 316L clad plate. Subsequent layers are deposited with an electrode chosen to match the cladding, eg 316L, 318. Also, as a buffer layer before hard surfacing with chromium carbide types. Dissimilar joints: Tolerance to dilution is exploited in joining stainless types 410, 304L, 321 and 316L to mild and low alloy steels such as stiffeners, brackets and other attachments. Service temperatures above 300°C are normally avoided. For some of these applications, a more economical alternative may be suitable, eg 309L, 307. Hardenable steels: The high level of alloying and ferrite level tolerates dilution from a wide range of alloyed and hardenable steels to give crack-free welds.
Specification
AWS A5.9: (nearest ER309LMo)
BS EN ISO 14343-A: 23 12 2 L
BS EN ISO 14343-B: (nearest SS309LMo)
BS 2901: Pt2 (nearest 309S95)
DIN 8556: SG X8 CrNiMo 23 13 (1.4459)