ASME SA-31-2021 pdf download

ASME SA-31-2021 pdf download.SPECIFICATION FOR STEEL RIVETS AND BARS FOR RIVETS, PRESSURE VESSELS.
5.2 Heat Analysis — An analysis of each heat of steel shall be made by the bar manufacturer to determine for Grades A and B the percentages of carbon, manganese, phosphorus, and sulfur. This analysis shall be made from a test ingot taken during the pouring of the heat. The chemical composition thus determined shall be reported to the purchaser or his representative and shall conform to the requirements for heat analysis in accordance with Table 1. 5.3 Product Analysis — An analysis may be made by the purchaser from finished materials representing each heat. The chemical composition thus determined shall con- form to the requirements for product analysis prescribed in Table 1. 5.4 Application of heats of steel to which bismuth, selenium, tellurium, or lead has been intentionally added shall not be permitted. 5.5 Chemical analyses shall be performed in accor- dance with Test Methods, Practices, and Terminology A 751. 6. Mechanical Properties 6.1 Rivet Bend Tests: 6.1.1 The rivet shank of Grade A steel shall stand being bent cold through 180° flat on itself, as shown in Fig. 1, without cracking on the outside of the bent portion. 6.1.2 The rivet shank of Grade B steel shall stand being bent cold through 180° without cracking on the outside of the bent portion in accordance with Table 2. 6.2 Rivet Flattening Tests — The rivet head shall stand being flattened, while hot, to a diameter 2 1 ⁄ 2 times the diameter ofthe shank, as shown in Fig. 2, without cracking at the edges. 6.3 Bar Tensile Properties — Bars shall conform to the tensile requirements in accordance with Table 3. 6.4 Bar Bend Tests: 6.4.1 The test specimen for Grade A steel bars shall stand being bent cold through 180° flat on itself without cracking on the outside of the bent portion. 7.1.2 Snap gage measurement shall be made at the point of minimum diameter, but it is not required that the rivet shall turn completely in the gage. Measurements of the maximum tolerance shall be made with a ring gage, all rivets to slip full to the head in the gage of the required size for the various diameters. 7.2 Bars — The diameter ofhot-finished rivet bars shall not vary from the size specified by more than the amounts in accordance with Table 5. 8. Workmanship, Finish, and Appearance 8.1 Rivets — The finished rivets shall be true to form, concentric, and free of injurious defects. 8.2 Bars: 8.2.1 Bars shall be free of visible pipe, undue segre- gation, and injurious surface imperfections. 8.2.2 Surface Finish—Thebars shallhaveacommer- cial hot-wrought finish obtained by conventional hot roll- ing. See 4.4 for producer’s descaling option. 9. Number of Tests and Retests 9.1 Rivets —Sampling forrivetbendandrivetflattening tests shall be in accordance with Guide F 1470, detection process. 9.2 Bars: 9.2.1 Two tension tests shall be made from each heat, unless the finished material from a heat is less than 50 tons (45 Mg), when one tension test will be sufficient. However, formaterial 2 in. (51 mm) andunderinthickness, when the material from one heat differs 3 ⁄ 8 in. (9.5 mm) or more in thickness, one tension test shall be made from both the thickest and the thinnest material rolled regardless of the weight represented. Each test shall conform to the specified requirements. 9.2.2 Retests on bars may be made in accordance with Specification A 29/A 29M. 10. Specimen Preparation 10.1 Rivets — Rivets shall be tested in their full-size finished condition. 10.2 Bars: 10.2.1 Test specimen selection and preparation shall be in accordance with Specification A 29/A 29M and Test Methods and Definitions A 370. 10.2.2 Tension and bend test specimens for rivet bars which have been cold drawn shall be normalized before testing.
12. Inspection 12.1 If the testing described in Section 9 is required by the purchaser, it shall be specified in the inquiry and contract or order. 12.2 The inspector representing the purchaser shall have free entry at all times, while work on the contract of the purchaser is being performed, to all parts of the manufacturer’s works that concern the manufacture of the material ordered. The manufacturer shall afford the inspec- tor all reasonable facilities, without charge, to satisfy him that the material is being furnished in accordance with this specification. All tests (except product analysis) and inspection shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shall be so conducted as not to interfere unnecessarily with the opera- tion of the works. 13. Rejection and Rehearing 13.1 Rivets — Rivets that fail to conform to the require- ments of this specification may be rejected. Rejection should be reported to the producer or supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer or supplier may make claim for a rehearing. 13.2 Bars — Rejection and rehearing shall be in accor- dance with Specification A 29/A 29M.