ASME SA-557 pdf free download

ASME SA-557-SA-557M-2021 pdf free download.SPECIFICATION FOR EL ECTRIC-RESISTANCE-WELDED CARBON STEEL FEEDWATER HEATER TUBES.
1.1 This specification covers minimum-wall-thickness, electric-resistance- welded, carbon steel tubes including those bent, if secified, into the form of U-tubes for applica- tion in tubular feedwater heaters.
1.2 The tubing sizes covered shall be1/8to 1/4 in. [15.9 to 31.8 mm] outside diameter, inclusive, and 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 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 specification. The inch-pound units shall apply unless the“M” designation of this specification is specified in the order.
2.Referenced Documents
2.1 ASTM Standards: A 450/A 450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes E 30 Methods for Chemical Analysis of Steel, Cast lron, Open-Hearth Iron, and Wrought Iron
3. General Requirements
3.1 Material furnished to this specification shall con- form to the applicable requirements of the current edition of Specification A 450/A 450M, unless otherwise provided herein.
4. Ordering Information 4.1 Orders for material to this specification should include the following as required to describe the desired material adequately: 4.1.1 Quantity (feet, metres, or number of pieces).
4.1.2 Name of material (electric -resistance-welded steel tubing).
4.1.3 Dimensions (outside diameter and minimum wall thickness).
4.1.4 Length (specific or random).
4.1.5 Manufacture (hot rolled or cold drawn; cold- rolled strip may be used as an alternate to hot-rolled strip).
4.1.6 Grade (Section 7) Table 1.
4.1.7 Optional requirements一If order specifies bending, a drawing of the U-tubes shall accompany the order. Purchaser must specify if stress-relief anneal of the U-bends is required (Product analysis, Section 8).
4.1.8 Test Report required (see Certification Section of Specification A 450/A 450M). 4.1.9 Specification designation. 4.1.10 Special requirements and any supplementary requirements selected.
5. Manufacture
5.1 Manufacture 一Tubes shall be made by electric- resistance welding. 5.2 Heat Treatment: 5.2.1 Following welding, tubes shall be normalized at a temperature of at least 1600^F [860°C] followed by cooling in air or cooling in the cooling zone of continuous atmosphere controlled furmnace.
5.2.2 If cold drawn, tubes shall be heated after the final cold-working operation to a temperature of at least 1200°F [640°C] to ensure ductility satisfactory for rolling into tube sheets and to meet the specified mechanical prop- erties.
5.2.3 If heat treatment of the U-bends is specified, such heat treatment shall consist of heating the stressed portion within a range from 1 100 to 1200*F [590 to 640°C].
6. Surface Condition
6.1 Finished tubes shall be free of scale but may have a superficial oxide film on the surfaces. A light -oxide scale on the outside and inside surfaces of U-bend shall be allowed for tubes which have been heat treated for relief of stress.
6.2 Finished tubes shall be coated on both outside and inside diameter with a thin parafin oil to prevent corrosion in transit. Other types of coatings may be applied as mutu- ally agreed upon and specified in the order. Chemical Composition
7.1 The steel shall conform to one of the requirements as to chemical composition as prescribed in Table 1.
7.2 For all tubes, the steel shall be fully killed.
7.3 When a grade is ordered under this specification, supplying an alloy grade that specificallyl requires the addi- tion of any element other than those listed for the ordered grade in Table I is not permitted. Product Analysis 8.1 When requested in the purchase order, a product analysis shall be made by the supplier from one tube or coil of steel per heat.ASME SA-557 pdf download.