ASTM A240M-1999a Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels
This ASTM A240M-1999a specification covers chromium, chromium-nickel, and chromium-manganese-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications including architectural, building, construction, and aesthetic applications.
The material covered under this specification shall conform to the requirements as to chemical composition, mechanical properties and heat treatment. The maximum thickness of products under this specification, irrespective of product form, shall not exceed 25 mm [1.0 inch] for any grade. Place and finish of product will be mutually agreed between the manufacturer and the purchaser.
ASTM A240M-1999a specification defines that steel shall be of Types 304, 304L, 310, 316, 316L, 321 and 347. Type 304 shall be equipped by the sum of not more than 0.08 percent carbon and not more than 2 percent manganese, with the remainder being a minimum of 8 percent of nickel and 18 percent of chromium. Type 304L shall be equipped by the sum of not more than 0.03 percent carbon and not more than 2 percent manganese, with the remainder being a minimum of 8 percent of nickel and 18 percent of chromium. Type 310 shall be equipped by the sum of not more than 0.25 percent carbon and not more than 1.5 percent silicon, with the remainder being a minimum of 10 percent of nickel and 24 percent of chromium. Type 316 shall be equipped by the sum of not more than 0.08 percent carbon and not more than 2 percent manganese, with the remainder being a minimum of 10 percent of nickel and 16 percent of chromium. Type 316L shall be equipped by the sum of not more than 0.03 percent carbon and not more than 2 percent manganese, with the remainder being a minimum of 10 percent of nickel and 16 percent of chromium. Type 321 shall be equipped by the sum of not more than 0.08 percent carbon, with the remainder being a minimum of 9 percent of nickel and 17 percent of chromium. Type 347 shall be equipped by the sum of not more than 0.08 percent carbon, with the remainder being a minimum of 9 percent of niobium, niobium plus tantalum and 10 percent of chromium.
Grades TP321 and TP347 stainless steel sheet and strip shall be pickled to remove surface contaminates. Grade TP304 stainless steel sheet and strip is to be cold-rolled to achieve the specified mechanical properties. After cold rolling, the product shall be annealed and pickled.
All materials under ASTM A240M-1999a specification shall conform to the requirements as to chemical composition, mechanical properties and heat treatment provided in the corresponding material specification and in the accompanying tables. The purchaser may specify in the invitation to tender which of the test shall be applied, and the details of such tests shall be mutually agreed between the purchaser and the manufacturer.
For plates and bars, test certificates shall bear the stamp of Destructive Testing or Non- Destructive Testing, or a combination thereof, as appropriate. As per ASTM A240M-1999a specification, additional tests such as correlation tests, micro-Hardness tests, macro-Hardness tests, forward-extension tests, stress-rupture tests, and penetration tests, remaining non-destructive tests shall be carried out at Shippers option.
The surfaces of all plates, strips, and sheets shall be thoroughly cleaned by machine and shall be free from oil and any other surface contamination, which would prevent satisfactory being made.
The grain size of the manufactured material should, when applicable, comply with the requirements of the applicable design codes. Surface parameters as per DIN 52156-56 shall be as per mutually agreed between producer and purchaser, and any surface imperfections, if present shall also be as per mutually agreed.
