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MMA Electrodes For Ferritic, Austenitic and Duplex Stainless Steels

ferritic-stainless-steel


Ferritic/Martensitic stainless have chromium levels of 12% - 18% as the main alloying element and have carbon levels to enable air hardening to a predominantly martensitic structure. Accordingly, detailed attention must be paid to both pre-heat and PWHT during and after welding.

Duplex stainless steels for general fabricational work can be considered non-heat treatable and it is imperative that the ratio of austenite to ferrite in the weld metal matches the microstructure of the parent plate. In order to achieve matching microstructure, the weld metal, particularly with reference to austenite formers, has a higher alloy content than the material being welded. The exception may occur with large repairs to castings when PWHT involves full solution heat treatment, eg: water quenching from 1100 ºC, then matching analysis weld metals should be considered.

Standard austenitics are those in the ASTM 3XX series and should, in the main, be welded with matching electrodes and for all fabricational purposes should be considered non-hardenable, non-heat treatable and thus show no PWHT requirement.

TYPE AWS A5.4 DESCRIPTION DATASHEET
NSD-308 E308-15 VARIOUS APPLICATIONS INVOLVING ASTM 304, 304L, 304NL, 301, 302, 303 AUSTENITIC STEELS Download
NSB-308 E308-16 Download
NSB-308Mo E308Mo-16 Download
NSD-308L E308L-15 Download
NSB-308L E308L-16 Download
NSB-308H E308H-16 Download
NSB-309 E309-16 TRANSITION WELDS BETWEEN STAINLESS and FERRITIC STEELS Download
NSB-309L E309L-16 Download
NSB-309MoL E309LMo-16 Download
NSB-309Nb E309Nb-16 Download
NSB-310 E310-16 WELDING ASTM 310 Download
NSB-310Mo E310Mo-16 Download
NSD-316L E316L-15 WELDING ASTM 316 AND 316L
STAINLESS STEELS
Download
NSB-316L E316L-16 Download
NSB-316 E316-16 Download
NSB-316H E316H-16 Download
NSB-317L E317L-16 WELDING ASTM 317L Download
NSB-317 E317-16 WELDING ASTM 317 Download
NSB-318 E318-16 WELDING ASTM 318 Download
NSD-347 E347-15 WELDING ASTM 347 and 321 Download
NSB-347 E347-16 Download
NSB-410 E410-26 WELDING VARIOUS GRADES OF FERRITIC / MARTENSITIC STAINLESS STEELS Download
NSB-17.4.Cu R E630-26 Download
NDS-2209 E2209-16 FOR WELDING DUPLEX STAINLESS STEEL Download
ND-2209 E2209-17 Download
NDS-25.9.4.NL E2594-16 FOR WELDING SUPERDUPLEX STAINLESS STEEL Download
ND-25.9.4.NL E2594-17 Download
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