Rationale: AMS4939C results from a Five-Year Review and update of this specification that includes the addition of ASTM E2994 (3.1), removal of sample size allowance for hydrogen of Table 1 (covered by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.3), recognizes that stricter ultrasonic testing meets requirement (3.6.1, 8.6), the addition of AS6279 (3.8), and revises Reporting (4.4) and Resampling (4.5).
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