ASME SA-513 pdf download SPECIFICATION FOR ELECTRIC-RESISTANCE-WELDED CARBON AND ALLOY STEEL MECHANICAL TUBING 4. Materials and Manufacture 4.1 The steel may be made by any process. 4.2 If a specific type of melting is required by the purchaser, it shall be as stated on the purchase order. 4.3 The primary melting may incorporate separate degassing or refining, and may be...