ASTM A513/A513M-12 pdf free.Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing. ASTM A513/A513M covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. This specification covers mechanical tubing made from hot- or cold-rolled steel. This specification covers round, square, rectangular, and special shape tubing. 3. Ordering Information 3.1 Orders for material under this specification should include...