Super Austenitic & High Alloy Plate — Manufacturer & Supplier
When 316L pits and duplex is ruled out — 904L, 254 SMO and Alloy 20.
These are the grades specified when ordinary stainless has already failed. 904L adds 4-5% molybdenum and copper for sulphuric and phosphoric acid service. 254 SMO carries 6% molybdenum with nitrogen for a PREN above 42, matching super duplex in natural seawater while keeping austenitic toughness and weldability. Alloy 20 is the niobium-stabilised, copper-bearing answer to hot sulphuric acid. All three must be welded with over-alloyed nickel-base filler to hold corrosion resistance in the weld.
Manufactured under the Stancor Stainless brand by Stancor Stainless.
Specifications
- gradeRange
- 904L (N08904), 254 SMO (S31254), Alloy 20 (N08020)
- thickness
- 3 mm to 60 mm
- prenRange
- 30 to 43
- width
- 1000 - 3000 mm
- length
- 2000 - 12000 mm
- surface
- No. 1 / 1D hot rolled annealed pickled; 2B, BA, No.4 on sheet
- cutting
- Plasma, laser and waterjet to drawing
- certification
- EN 10204 3.1 (3.2 on request)
Super Austenitic & High Alloy Plate Applications
- Sulphuric & phosphoric acid plant
- Flue gas desulphurisation
- Seawater heat exchangers
- Pulp & paper bleach plant
- Pickling line tanks
Applicable Standards & Specifications
- ASTM A240 / ASME SA240
- EN 10088-2
- EN 10028-7