ASME SA268-2010 pdf download

ASME SA268-2010 pdf download.SPECIFICATION FOR SEAMLESS AND WELDED FERRITIC AND MARTENSITIC STAINLESS STEEL TUBING FOR GENERAL SERVICE.
4.1.1 Quantity (feet, metres, or number of lengths), 4.1.2 Name of material (seamless or welded tubes), 4.1.3 Grade (Table 1), 4.1.4 Size (outside diameter and nominal wall thickness), 4.1.5 Length (specific or random), 4.1.6 Optional requirements (hydrostatic or nonde- structive electric test, Section 16), 4.1.7 Test report required (Certification Section of Specification A 1016/A 1016M), 4.1.8 Specification designation, 4.1.9 Intergranular corrosion test, and 4.1.10 Special requirements. 5. General Requirements 5.1 Material furnished under this specification shall conform to the applicable requirements of Specification A 1016/A 1016M unless otherwise provided herein. 6. Manufacture 6.1 The tubes shall be made by the seamless or welded process with no filler metal added. 7. Heat Treatment 7.1 As a final heat treatment, tubes shall be reheated to a temperature of 1200°F [650°C] or higher and cooled (as appropriate for the grade) to meet the requirements of this specification. 7.2 The martensitic grade UNS S41500 shall be reheated to a temperature of 950°F [510°C] or higher and cooled as appropriate to meet the requirements of this specification. 8. Chemical Composition 8.1 The steel shall conform to the chemical require- ments prescribed in Table 1. 9. Product Analysis 9.1 An analysis of either one billet or one length of flatrolled stock or one tube shall be made from each heat. The chemical composition thus determined shall conform to the requirements specified. 9.2 The product analysis tolerance of the Chemical Requirements Table of A 480/A 480M shall apply.
9.3 If the original test for product analysis fails, retests of two additional billets, lengths of flat-rolled stock or tubes shall be made. Both retests for the elements in ques- tion shall meet the requirements ofthe specification; other- wise all remaining material in the heat or lot shall be rejected or, at the option of the producer, each billet or tube may be individually tested for acceptance. Billets, lengths of flat-rolled stock or tubes which do not meet the requirements of the specification shall be rejected. 10. Tensile Requirements 10.1 The material shallconformto the tensile properties prescribed in Tables 3 and 4. 11. Hardness Requirements 11.1 The tubes shall have a hardness number not to exceed those prescribed in Table 5. 12. Permissible Variations in Dimensions 12.1 Variations in outside diameter, wall thickness, and length from those specified shall not exceed the amounts prescribed in Table 6. 12.2 The permissible variations in outside diameter given in Table 6 are not sufficient to provide for ovality in thin-walled tubes, as defined in the Table. In such tubes, the maximum and minimum diameters at any cross section shall deviate from the nominal diameter by no more than twice the permissible variation in outside diameter given in Table 6; however, the mean diameteratthat cross section must still be within the given permissible variation. 12.3 When the specified wall is 2% or less of the specified outside diameter, the method of measurement is in accordance with the agreement between the purchaser and the manufacturer (see Note 1). NOTE 1 — Very thin wall tubing may not be stiffenough for the outside diameter to be accurately measured with a point contact test method, such as with the use of a micrometer or caliper.
14. Mechanical Tests Required 14.1 Tension Tests — One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes. 14.2 Flaring Test (forSeamless Tubes) — One test shall be made on specimens from one end of one tube from each lot of finished tubes. The minimum expansion of the inside diameter shall be 10%. For tubes over 8 in. [203.2 mm] in outside diameter, or tubes with wall thick- ness 3 ⁄ 8 in. [9.52 mm] and over, the flattening test may be performed instead of the flaring test unless the flaring test is specified in the purchase order. 14.3 Flange Test (for Welded Tubes) — One test shall be made on specimens from one end of one tube from each lot of finished tubes. For tubes over 8 in. [203.2 mm] in outside diameter, or tubes with wall thickness 3 ⁄ 8 in. [9.52 mm] and over, the flattening test may be performed instead of the flange test unless the flange test is specified in the purchase order. 14.4 Hardness Test — Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot. 14.5 When more than one heat is involved, the tension, flaring, flanging, and hardness test requirements shall apply to each heat.