Stainless Steel 347/347H
347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel. This material is stabilized against chromium carbide formation by the addition of columbium and tantalum. Since these elements have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries. 347 should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC) or for welding under conditions that prevent a post-weld anneal. 347 is non-magnetic.
Application Industries
These materials are not a single material but the name for a family of corrosion resistant steels. Like many scientific breakthroughs, the origins of stainless steel lies in a lucky accident. From the smallest part of the zipper to the largest building skyscraper.
Metal fabrication is widely used across various industrial sectors such as mining, construction, manufacturing, shipbuilding, automotive, aerospace, and energy.
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
347 | min. | - | - | - | - | 17.0 | - | 9.0 | - | |
max. | 0.08 | 2.0 | 1.0 | 0.040 | 0.030 | 20.0 | 13.0 | - | ||
347H | min. | 0.04 | - | - | - | - | 17.0 | - | 9.0 | 8xCmin |
max. | 0.10 | 2.0 | 1.0 | 0.040 | 0.030 | 19.0 | 13.0 | 1.0 max | ||
Equivalent Grade
Standard | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
SS 347 | 1.4550 | S34700 | SUS 347 | - | 08Ch18N12B | - | X6CrNiNb18-10 |
SS 347H | 1.4961 | S34709 | SUS 347H | - | - | - | X6CrNiNb18-12 |