ASME SB 348:2017 pdf free download – Standard Specification for Titanium and Titanium Alloy Bars and Billets
8. Workmanship, Finish, and Appearance
8.1 Titanium and titanium alloy bar and billet shall be free of injurious external and internal imperfections of a nature that will interfere with the purpose for which it is intended. Annealed material may be furnished as descaled, sandblasted, ground, or rough turned. The manufacturer shall be permitted to remove minor surface imperfections by spot grinding ifsuch grinding does not reduce the thickness of the material below the minimum permitted by the tolerance for the thickness ordered.
9. Sampling
9.1 Samples for chemical analyses shall be representative of the material being tested. The utmost care must be used in sampling titanium for chemical analysis because of its great affinity for elements such as oxygen, nitrogen, and hydrogen. Therefore, in cutting samples for analysis, the operation should be carried out insofar as possible in a dust-free atmosphere. Chips should be collected from clean metal and tools should be clean and sharp. Samples for analysis should be stored in suitable containers. 9.2 At least two samples for chemical analysis shall be tested to determine chemical composition. Samples shall be taken from the ingot or from the opposite extremes of the product to be analyzed.
10. Methods of Chemical Analysis
10.1 The chemical analysis shall normally be conducted using the ASTM standard test methods referenced in 2.1. Other industry standard methods may be used where the ASTM test methods in 2.1 do not adequately cover the elements in the material or by agreement between the producer and the purchaser. Alternate techniques are discussed in Guide E2626.
11. Retests
11.1 If the results of any chemical or mechanical property test lot are not in conformance with the requirements of this specification, the lot may be retested at the option of the manufacturer. The frequency ofthe retest will double the initial number of tests. If the results of the retest conform to the specification, then the retest values will become the test values for certification. Only original conforming test results or the conforming retest results shall be reported to the purchaser. If the results for the retest fail to conform to the specification, the material will be rejected in accordance with Section 14.
12. Referee Test and Analysis
12.1 In the event ofdisagreement between the manufacturer and the purchaser on the conformance of the material to the requirements of this specification, a mutually acceptable ref- eree shall perform the tests in question using the ASTM standard methods in 2.1. The referee’s testing shall be used in determining conformance of the material to this specification.
13. Rounding-Off Procedure
13.1 For purposes of determining conformance with the specifications contained herein, an observed or a calculated value shall be rounded off to the nearest “unit” in the last right-hand significant digit used in expressing the limiting value. This is in accordance with the round-off method of Practice E29.
14. Rejection
14.1 Material not conforming to this specification or to authorized modifications shall be subject to rejection. Unless otherwise specified, rejected material may be returned to the manufacturer at the manufacturer’s expense, unless the pur- chaser receives