March 5, 2010
ASTM Intl. Committees A01 on Steel, Stainless Steel and Related Alloys and A05 on Metallic-Coated Iron and Steel Products, W. Conshohocken, Pa., have approved revisions to two ASTM standards that clarify the thickness tolerances for both uncoated and coated steel sheet products.
The standards are A568/A568M, "Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for"; and ASTM A924/A924M, "Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process."
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 2009, all general steel sheet and product specifications have default thickness tolerance tables with limits that can be used worldwide.
The committees have moved the 3/8-in. edge distance tables from the body of A568/A568M and A924/A924M to the Supplementary Requirements sections of these documents. The 1-in. edge distance tables are now the default applicable thickness tolerances unless the supplementary 3/8-in. tables are called out on the purchase order.
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