ASTM B364-96 pdf free.Standard Specification for Tantalum and Tantalum Alloy Ingots.
The material shall conform to the requirements forchemical composition in accordance with Table 1.Analysis for elements not listed in Table 1 and notnormally expected in tantalum shall not be required unlessspecified at time of purchase.
In the event of dispute over conformity of the material tothis specification，upon agreement between the purchaser andthe seller as to procedure,representative samples of thematerial may be submitted to a referee for analysis.The permissible overshipment shall be negotiated between the purchaser and the manufacturer.The manufacturer shall use care to have each lot of ingotmaterial as uniform in quality as possible.When specified, the ingots shall be conditioned on thesurface to standards agreed upon between the manufacturer andthe purchaser.In the conditioned ingot,no abrupt change in diameteror local depressions that will impair subsequent fabrication willbe permitted. The difference between maximum and minimumradius of the conditioned ingot shall not exceed 20 % of themaximum radius.Each ingot shall be tested for soundness by nondestructive test methods，such as dye penetrant and ultrasonic tests.Methods and acceptance standards shall be as mutually agreedupon between the purchaser and the manufacturer.
Defects in the ingots that exceed the acceptance stan-dards shall be removed by cropping or surface conditioning,whichever is appropriate. The manufacturer shall be permittedto remove surface imperfections provided that after eachremoval the requirements of conditioning are met (see 7.3).7.6 The ingots shall be free of imperfections that would bedeemed injurious by the standards of acceptability agreed upon between the purchaser and the manufacturer.8. Significance of Numerical Limits
For the purpose of determining compliance with thespecified limit for requirements of the properties listed in thetables, an observed value or a calculated value shall be roundedas indicated in accordance with the rounding method ofPractice E 29.Care shall be exercised to ensure that the sampleselected for testing is representative of the material and that itis not contaminated by the sampling procedure.If there is anyquestion relating to the sampling techniques or to the analysisthereof，the methods for sampling and analysis shall be asagreed upon between the purchaser and the manufacturer.Material that fails to conform to the requirements ofthis specification may be rejected.Rejection should be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test,the producer orsupplier may make claim for a rehearing.ASTM B364 pdf download.