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ASME SA 335-2007 pdf download

ASME SA 335-2007 pdf download.SPECIFICATION FOR SEAMLESS FERRITIC ALLOY- STEEL PIPE FOR HIGH-TEMPERATURE SERVICE. NPS and schedule number, Outside diameter and nominal wall thickness, Outside diameter and minimum wall thickness, Inside diameter and nominal wall thick- ness, and Inside diameter and minimum wall thickness. 3.1.6 Length (specific or random), 3.1.7 End finish (Ends Section of Specification A 999/A 999M), 3.1.8 Optional requirements (Sections 8, 11, and 12, of this specification. See the Sections on Hydrostatic Test Requirements and Permissible Variation in Weight for Seamless Pipe in Specification A 999/A 999M), 3.1.9 Test report required (Certification section of Specification A 999/A 999M), 3.1.10 Specification designation, and 3.1.11 Special requirements or any supplementary requirements selected, or both. 4. General Requirements 4.1 Material furnished to this specification shall con- form to the applicable requirements of the current edition ofSpecification A 999/A 999M, unless otherwise provided herein. 5. Materials and Manufacture 5.1 Pipe may be either hot finished or cold drawn with the finishing treatment as required in 5.3. 5.2 Grade P2 and P12 — The steel shall be made by coarse-grain melting practice. Specific limits, if any, on grain size or deoxidation practice shall be a matter of agreement between the manufacturer and purchaser. 5.3 Heat Treatment: 5.3.1 All pipe shall be reheated for heat treatment and heat treated in accordance with the requirements of Table 2. NOTE 3 — It is recommended that the temperature for tempering should be at least 100°F [50°C] above the intended service temperature; conse- quently, the purchaser should advise the manufacturer if the service temperature is to be over 1100°F [600°C]. NOTE 4 — Certain of the ferritic steels covered by this specification will harden if cooled rapidly from above their critical temperature. Some will air harden, that is, become hardened to an undesirable degree when cooled in air from high temperatures. Therefore, operations involving heating such steels above their critical temperatures, such as welding, flanging, and hot bending, should be followed by suitable heat treatment. 6. Chemical Composition 6.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 1. 7. Workmanship, Finish, and Appearance 7.1 The pipe manufacturer shall explore a sufficient number of visual surface imperfections to provide reason- able assurance that they have been properly evaluated with respect to depth. Exploration of all surface imperfections is not required but may be necessary to ensure compliance with 7.2. 7.2 Surface imperfections that penetrate more than 12 1 ⁄ 2 % of the nominal wall thickness or encroach on the minimum wall thickness shall be considered defects. Pipe with such defects shall be given one of the following dispo- sitions: 7.2.1 The defect may be removed by grinding pro- vided that the remaining wall thickness is within specified limits. 7.2.2 Repaired in accordance with the repair welding provisions of 7.6. 7.2.3 The section of pipe containing the defect may be cut off within the limits of requirements on length. 7.2.4 Rejected. 7.3 To provide a workmanlike finish and basis for evaluating conformance with 7.2, the pipe manufacturer shall remove by grinding the following: 7.3.1 Mechanical marks, abrasions (Note 5) and pits, any ofwhich imperfections are deeper than 1 ⁄ 16 in. [1.6 mm]. NOTE 5 — Marks and abrasions are defined as cable marks, dings, guide marks, roll marks, ball scratches, scores, die marks, and the like. 7.3.2 Visual imperfections, commonly referred to as scabs, seams, laps, tears, or slivers, found by exploration in accordance with 7.1 to be deeper than 5% of the nominal wall thickness. 7.4 At the purchaser’s discretion, pipe shall be subject to rejection if surface imperfections acceptable under 7.2 are not scattered, but appear over a large area in excess of what is considered a workmanlike finish. Disposition of such pipe shall be a matter of agreement between the manufacturer and the purchaser. 7.5 When imperfections or defects are removed by grinding, a smooth curved surface shall be maintained, and the wall thickness shall not be decreased below that permitted by this specification. The outside diameter at the point of grinding may be reduced by the amount so removed.

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