317L

This consumable is specifically designed for welding 317/317L austenitic stainless steels. It proves ideal for situations of extreme corrosion, typical of the chemical sectors, flue gas desulfurization, seawater desalination, and in particular, the paper, pulp, and textile industries. It is also widely used in marine applications, paper production, chemical processes, and food processing. Additionally, it is suitable for joining 316/316L steels, with a significant advantage: the high molybdenum content in the weld metal enhances resistance to pitting and crevice corrosion in highly corrosive environments. The material offers outstanding resistance to stress corrosion cracking and high tolerance to pitting. The service temperature ranges from -120 °C to 300 °C. Welding these molybdenum-alloyed steels requires attention. Successive passes can cause the formation of secondary phase precipitates in the weld metal. Therefore, it is recommended to limit heat input to a maximum of 1.5 kJ/mm and to keep the interpass temperature below 150 °C. Generally, post-weld heat treatment is not required, but in particular circumstances, a solution anneal between 1080 °C and 1130 °C followed by water quenching may be performed.

The nominal composition (wt. %) of alloy is 19.5 Cr, 14 Ni, 3.5 Mo, similar but more alloyed than ER316.

The fillers are fully-austenitic and slightly over-alloyed.

• EN W.Nr.: 1.4436 (X3CrNiMo17-13-3), 1.4439 (X2CrNiMoN17-13-5), 1.4429 (X2CrNiMoN17-13-3), 1.4438 (X2CrNiMo18-15-4), 1.4583 (X10CrNiMoNb18-12)
• ASTM: 316Cb, 316LN, 317LN, 317L, A351 CG8M, CG3M
• UNS: S31726, J92999