Aerospace series - Test method for metallic materials - Ultrasonic inspection of bars, plates, forging stock and forgings - Part 4: Acceptance criteria; German and English version EN 4050-4:2012
航空航天系列.金属材料的试验方法.棒材、板材、锻坯和锻件的超声波检验.第4部分:验收标准;德语和英语版本EN 4050-4:2012