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4 main groups of stainless steel are used in the fabrication industry - namely:
1. Ferritic/Martensitic Stainless
2. Austenitic Stainless
3. Duplex Stainless
4. Super-modified Austenitics
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 | Description | Datasheet | MSDS |
|---|---|---|---|---|
| NSN-308 | AWS A5.4 E308-16 | For welding Austenitic Stainless Steels containing a nominal 19Cr and 10Ni NSN-308Mo AWS A5.4 E308Mo-16 For welding 19Cr-10Ni-2.5Mo Austenitic Stainless Steels NSD-308L AWS A5.4 E308L-15 For welding low Carbon Austenitic Stainles Steels containing a nom | DOWNLOAD | No Content Available |
| NSN-308Mo | AWS A5.4 E308Mo-16 | For welding 19Cr-10Ni-2.5Mo Austenitic Stainless Steels | No Content Available | No Content Available |
| NSD-308L | AWS A5.4 E308L-15 | For welding low Carbon Austenitic Stainles Steels containing a nominal 19Cr and 10Ni | No Content Available | No Content Available |
| NSN-308L | AWS A5.4 E308L-16 | For welding low Carbon Austenitic Stainless Steels containing a nominal 19Cr and 10Ni | No Content Available | No Content Available |
| NSK-308LMo | AWS A5.4 E308LMo-17 | For welding low carbon 19Cr-10Ni-2.5Mo Austenitic Stainless Steels | No Content Available | No Content Available |
| NSN-308H | AWS A5.4 E308H-16 | For welding Austenitic Stainlesss Steels containing a nominal 19Cr and 10Ni | No Content Available | No Content Available |
| NSN-309 | AWS A5.4 E309-16 | For welding Austenitic Stainlesss Steels containing a nominal 23Cr-12Ni used for dissimilar welds between Stainless and C-Mn steels | No Content Available | No Content Available |
| NSK-309 | AWS A5.4 E309-17 | For welding Austenitic Stainlesss Steels containing a nominal 23Cr-12Ni used for dissimilar welds between Stainless and C-Mn steels | No Content Available | No Content Available |
| NSN-309L | AWS A5.4 E309L-16 | For welding low Carbon Austenitic Stainless Steels containing a nominal 23Cr-12Ni used for dissimilar welds between Stainless and C-Mn steels | No Content Available | No Content Available |
| NSK-309L | AWS A5.4 E309L-17 | For welding low Carbon Austenitic Stainless Steels containing a nominal 23Cr-12Ni used for dissimilar welds between Stainless and C-Mn steels | No Content Available | No Content Available |
| NSN-309MoL | AWS A5.4 E309LMo-16 | For welding low Carbon Austenitic Stainless Steels containing a nominal 23Cr-12Ni – 3Mo used for dissimilar welds between Stainless and C-Mn steels | No Content Available | No Content Available |
| NSN-309Nb | AWS A5.4 E309Nb-16 | For welding 347 clad steels or where Niobium stabilised weld metal is required in overlays, or inlays, on C-Mn or Low-Alloy Steels | No Content Available | No Content Available |
| NSD-310 | AWS A5.4 E310-15 | For welding fully austenitic stainless steels containing a nominal 25 Cr and 20Ni | No Content Available | No Content Available |
| NSN-310Mo | AWS A5.4 E310Mo-16 | For welding fully Austenitic Stainless Steels containing a nominal 25Cr-20Ni–2.5Mo | No Content Available | No Content Available |
| NSK-316L | AWS A5.4 E316L-17 | For welding low Carbon Austenitic Stainless Steels containing a nominal 19Cr-12Ni-2.5Mo | No Content Available | No Content Available |
| NSN-316 | AWS A5.4 E316-16 | For welding Austenitic Stainless Steels containing a nominal 19Cr-12Ni-2.5Mo | No Content Available | No Content Available |
| NSK-316 | AWS A5.4 E316-17 | For welding Austenitic Stainless Steels containing a nominal 19Cr-12Ni-2.5Mo | No Content Available | No Content Available |
| NSN- 317L | AWS A5.4 E317L-16 | For welding low Carbon Austenitic Stainless Steels containing a nominal 19Cr-13Ni-3.5Mo | No Content Available | No Content Available |
| NSK-317 | AWS A5.4 E317-17 | For welding Austenitic Stainless Steels containing a nominal 19Cr-13Ni-3.5Mo | No Content Available | No Content Available |
| NSK- 317L | AWS A5.4 E317L-17 | For welding low Carbon Austenitic Stainless Steels containing a nominal 19Cr-13Ni-3.5Mo | No Content Available | No Content Available |
| NSN-318 | AWS A5.4 E318-16 | For welding Austenitic Stainless Steels containing a nominal 18Cr-12Ni-2.7Mo-Nb | No Content Available | No Content Available |
| NSD-347 | AWS A5.4 E347-15 | For welding stabilised Austenitic Stainless Steels containing a nominal 19 Cr and 10Ni | No Content Available | No Content Available |
| NSN-347 | AWS A5.4 E347-16 | For welding stabilised Austenitic Stainless Steels containing a nominal 19 Cr and 10Ni | No Content Available | No Content Available |
| NSN-410NiMo | AWS A5.4 E410NiMo-26 | For welding martensitic stainless steels when improved corrosion resistance and sub-zero toughness is required | No Content Available | No Content Available |
| NSN-410 | AWS A5.4 E410-26 | For welding 12% Chromium Martensitic Stainless Steels | No Content Available | No Content Available |
| NDS-2209 | AWS A5.4 E2209-16 | For welding Duplex Stainless Steels that need a matching microstructure in the as welded condition - namely 55 to 65 Austenite 35 to 45 Ferrite | No Content Available | No Content Available |
| ND-2209 | AWS A5.4 E2209-17 | For welding Duplex Stainless Steels that need a matching microstructure in the as welded condition - namely 55 to 65 Austenite 35 to 45 Ferrite | No Content Available | No Content Available |
| NDS-25.9.4.NL | AWS A5.4 E2594-16 | For welding Duplex Stainless Steels that need a matching microstructure in the as welded condition - namely 55 to 65 Austenite 35 to 45 Ferrite | No Content Available | No Content Available |
| ND-25.9.4.NL | AWS A5.4 E2594-17 | For welding Duplex Stainless Steels that need a matching microstructure in the as welded condition - namely 55 to 65 Austenite 35 to 45 Ferrite | No Content Available | No Content Available |
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