铸钢件.超声波检验.第2部分:高应力部件用铸钢件

[中文适用范围]： 本文件规定了高应力部件的钢铸件（具有铁素体结构）的超声波检测要求，以及通过脉冲回波技术确定内部不连续性的方法。 购买者根据性能或安全性的需要来确定组件是否承受高应力。 本文件适用于通常经过晶粒细化热处理且壁厚不超过 600 毫米（含 600 毫米）的铸钢件的超声波检测。 对于更大的壁厚，适用于测试程序和验收水平的特殊协议。 本文件不适用于奥氏体钢和接头焊缝。 [外文原描述]： This document specifies the requirements for the ultrasonic testing of steel castings (with ferritic structure) for highly stressed components, and the methods for determining internal discontinuities by the pulse-echo technique. Purchasers determine if components are highly stressed based on the need for performance or safety. This document applies to the ultrasonic testing of steel castings which have usually received a grain-refining heat treatment and which have wall thicknesses up to and including 600 mm. For greater wall thicknesses, special agreements apply with respect to the test procedure and the acceptance levels. This document does not apply to austenitic steels and to joint welds.