Stainless steel plate, from about 4 mm to over 100 mm thick, rolled on a reversing quarto mill or cut from hot-rolled coil, annealed and pickled. It is the material of pressure vessels, tanks, heat exchangers, scrubbers, desalination evaporators, flanges and heavy fabrications in the chemical, oil and gas, water, pulp and paper and food industries.
Two routes make stainless plate. Quarto plate is rolled from a slab on a reversing mill to the exact thickness, width and length ordered, then solution annealed, levelled and pickled — this is the route for heavy, wide and long plates and for the special grades. Coil plate is cut from hot-rolled annealed and pickled coil, which is cheaper and flatter in the thinner sizes (roughly 4–12 mm) but limited to the coil width. Both come with a No. 1 (1D) finish; plate can also be ground or blasted.
Most stainless plate goes into pressure equipment and is ordered to ASTM A240 or ASME SA-240, or EN 10028-7 for European pressure codes, usually dual certified (304/304L, 316/316L). Dimensional tolerances for quarto plate are in EN ISO 18286 and ASTM A480; for coil plate in EN ISO 9444-2. Heavy plate is often ultrasonically tested, and duplex plate is checked for ferrite content and impact toughness, because poor heat treatment leaves harmful intermetallic phases.
Duplex 2205 and super duplex 2507 plate have roughly twice the yield strength of 316L, which allows thinner vessel walls, and resist chloride stress-corrosion cracking. Together with 316L and 904L they are the plates of desalination plants — multi-stage flash and multi-effect evaporators, seawater intake and brine equipment — that are a large part of GCC stainless demand, alongside oil, gas and petrochemical vessels.
Plate for GCC projects is imported, largely from Europe, India, China, Korea and Japan, and supplied by stockists who cut it to shapes and rings with plasma and waterjet. Many fabricators in Saudi Arabia, the UAE and Qatar roll and weld stainless plate into vessels and tanks under ASME code stamps.
Plate is ordered by grade, thickness, width, length and finish, and for pressure work by the specification and testing. The weight table below gives the mass per square metre and per plate.
Full dimensions: Stainless plate weights by thickness and plate size
| Region | Standard | What it covers |
|---|---|---|
| USA | ASTM A240/A240M ASTM |
Chromium and chromium-nickel stainless steel plate, sheet and strip for pressure vessels and general applications |
| USA | ASTM A480/A480M ASTM |
General requirements for flat-rolled stainless steel plate, sheet and strip — tolerances |
| USA | ASME SA-240 ASME |
ASME Boiler and Pressure Vessel Code adoption of ASTM A240 |
| Europe | EN 10028-7 CEN-CENELEC |
Flat products made of steels for pressure purposes — stainless steels |
| Europe | EN 10088-2 CEN-CENELEC |
Stainless steels — sheet, plate and strip for general purposes |
| Europe | EN 10088-4 CEN-CENELEC |
Stainless steels — sheet, plate and strip for construction purposes |
| International | EN ISO 18286 ISO |
Hot-rolled stainless steel plates (quarto plate) — tolerances on dimensions and shape |
| International | EN ISO 9444-2 ISO |
Continuously hot-rolled stainless steel — tolerances — wide strip and sheet/plate (coil plate) |
| Japan | JIS G4304 JSA |
Hot-rolled stainless steel plate, sheet and strip |
| China | GB/T 4237 SAC |
Hot-rolled stainless steel plate, sheet and strip |
| India | IS 6911 BIS |
Stainless steel plate, sheet and strip |
| Russia / CIS | GOST 7350 | Thick sheet of corrosion-resistant, heat-resistant and creep-resistant steel |
Grade equivalents and the standards bodies: Steel grades & standards
Steel Mills - Agents & Traders · Tube Manufacturer · Stockist - Distributor · Dubai
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