Currently A01.13 contains the following statement: 3.2.1 As with any mechanical testing, deviations from either specification limits or expected as-manufactured properties can occur for valid reasons besides deficiency of the original as-fabricated product. These reasons include, but are not limited to: subsequent service degradation from environmental exposure (for example, temperature, corrosion); static or cyclic service stress effects, mechanically-induced damage, material inhomogeneity, anisotropic structure, natural aging of select alloys, further processing not included in the specification, sampling limitations, and measuring equipment calibration uncertainty. There is statistical variation in all aspects of mechanical testing and variations in test results from prior tests are expected. An understanding of possible reasons for deviation from specified or expected test values should be applied in interpretation of test results. There are currently no recommendations or allowances for variation beyond product specification limits for mechanical properties. The purpose of this revision is to begin to address tolerances for mechanical properties. There is a pressing need for mechanical property product check tolerances. Material grades exist that have very narrow ranges for mechanical properties. Recognizing the importance of addressing product test tolerances for mechanical properties, this revision adds an informative appendix and an annex. The annex at this time covers only limited tension testing. The intention is that in the future, the annex will be expanded to include other testing.
Date Initiated: 01-26-2021
Technical Contact: Lester Burgess
Ballot: A01.13 (21-01)
Status: Will Reballot Item
Ballot: A01.13 (22-02)
Status: Negative Votes Need Resolution