ASTM A568 PDF

More A The steel sheets shall be manufactured by hot-rolling, cold-rolling or temper rolling. Cold-rolled sheets shall undergo annealing after being cold reduced to thickness. Products shall undergo cast or heat analysis, product, check, or verification analysis, and sampling. Product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium, molybdenum, vanadium, columbium, niobium, titanium, aluminum, and nitrogen.

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Previously, standards for these products included two sets of tolerance tables for each product, neither of which was the default. Purchasers were required to decide which set of tables applied to their purchase orders. With the approval of these standards in November , all general steel sheet and product specifications have default thickness tolerance tables with limits that can be used worldwide.

In the past, each set of thickness tolerance tables differed not only in tolerance limits but also in how close to the edge of the sheet these limits applied. Thickness fall-off close to the sheet edge is a natural phenomenon that occurs during hot and cold rolling. On purchase orders, the buyer was required to specify which set applied. The 1-in. The Ordering Information section of each product specification has been revised to direct purchasers to the supplementary tables in the respective general specifications.

These revisions make available thickness tolerances much clearer, as there is only one set of tables in the body of the specifications. Because these tables are now the equivalent of any in the world, requests for "one-half ASTM thickness tolerance" should decline.

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