The specification for ASTM A240 envelopes several chromium as well as chromium alloy based stainless steel grades. This specification covers the fore mentioned alloy that has been manufacture in the form of ASTM A240 Type 2507 Super Duplex Plate, sheet, or strips.. Generally the ASTM A240 specified 5mm Thick Cold Rolled Super Duplex 2507 Sheet have been designed for use in application... https://www.svstainless.com/stainless-steel-super-duplex-2507-plates-stockists-suppliers.php