RW 347 series is a stainless steel series for welding, used for AISI 347, AISI 321, and similar Cr-Ni stainless steels. Niobium reduces grain-boundary chromium carbide precipitation and supports intergranular corrosion resistance. RW 347's lower silicon level helps reduce hot-cracking sensitivity. RW 347Si serves niobium-, titanium-, or tantalum-containing stainless steels operating up to 400 °C.
| Product | Nominal Composition | EN ISO 14343-B: 2017 | AWS A5.9-2017 Alloy Designation |
DIN Werkstoff Nr. |
|---|---|---|---|---|
| RW 347 | 19 9 Nb | SS347 | ER347 | 1.4551 |
| RW 347Si | 19 9 Nb Si | SS347Si | ER347Si | 1.4551 |
| Element | RW 347 | RW 347Si |
|---|---|---|
| C | CRW 347≤ 0,08 % | CRW 347Si≤ 0,08 % |
| Mn | MnRW 3471,00-2,50 % | MnRW 347Si1,00-2,50 % |
| Si | SiRW 3470,30-0,65 % | SiRW 347Si0,65-1,00 % |
| S | SRW 347≤ 0,020 % | SRW 347Si≤ 0,020 % |
| P | PRW 347≤ 0,030 % | PRW 347Si≤ 0,030 % |
| Cr | CrRW 34719,0-21,0 % | CrRW 347Si19,0-21,0 % |
| Ni | NiRW 3479,0-11,0 % | NiRW 347Si9,0-11,0 % |
| Mo | MoRW 347≤ 0,30 % | MoRW 347Si≤ 0,30 % |
| Cu | CuRW 347≤ 0,30 % | CuRW 347Si≤ 0,30 % |
| Nb | NbRW 34710xC-1,00 % | NbRW 347Si10xC-1,00 % |
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