ASTM A556-2018 pdf free download

ASTM A556-2018 pdf free download.Standard Speci fication for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes
1. Scope
1.1 This speci fication covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes, if specified, for use in tubular feedwater heaters. 1.2 The tubing sizes covered shall be ⁄ 8 to 1 ⁄ 4 -in. [15.9 to 31.8-mm] outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 in. [1.1 mm]. 1.3 Optional supplementary requirements are provided, and when desired, shall be stated in the order. 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specifi- cation. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Ordering Information
3.1 Orders for material under this specification should include the following as required to describe the desired material adequately: 3.1.1 Quantity (feet, metres, or number of pieces), 3.1.2 Name of material (seamless steel tubing), 3.1.3 Dimensions (outside diameter and minimum wall thickness), 3.1.4 Length (specific or random), 3.1.5 Manufacture (cold drawn), 3.1.6 Grade (chemical composition), 3.1.7 Optional requirements, 3.1.8 Bending Requirements—If order specifies tubes to be bent, the design of the U-tubes shall accompany the order. Purchaser must specify if stress-relief anneal of the U-bends is required, 3.1.9 Test report required (see Certification Section of Specification A450/A450M), 3.1.10 Specification number, and 3.1.11 Special requirements and any supplementary require- ments selected.
5. Manufacture
5.1 Manufacture—Tubes shall be made by the seamless process and shall be cold drawn. 5.2 Heat Treatment: 5.2.1 Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°F [640°C] or higher to ensure ductility satisfactory for rolling into tube sheets and to meet mechanical properties as specified. 5.2.2 If stress-relief anneal of the U-bends is specified, the anneal shall consist of heating the bent portion within a range of 1100 to 1200°F [585 to 640°C].
6. Chemical Composition
6.1 The steel shall conform to one of the requirements as to chemical composition as prescribed in Table 1. 6.2 When a grade is ordered under this specification, sup- plying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade in Table 1 is not permitted.
7. Product Analysis
7.1 When requested in the purchase order, a product analy- sis shall be made by the manufacturer or supplier from one tube or billet per heat. 7.2 If the original test for product analysis fails, retests of two additional tubes or billets shall be made. Both retests for the elements in question shall meet the requirements of this specification; otherwise, all remaining material in the heat or lot (Note 1) shall be rejected or, at the option of the producer, each tube may be individually tested for acceptance. Tubes that do not meet the requirements of this specification shall be rejected. NoTE 1一 For tension and hardness test requirements， the term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness which are produced from the same heat of steel. When final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace, a lot shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat and furnace speed.