本文件规定了一般用途的铸钢件（含铁素体结构）超声波检测的要求，以及通过脉冲回波技术确定内部不连续性的方法。 本文件适用于通常经过晶粒细化热处理且壁厚不超过600 mm的铸钢件的超声波检测。对于更大的壁厚，有关试验程序和验收水平的特殊协议适用。 本文件不适用于奥氏体钢和接头焊缝。

This document specifies the requirements for the ultrasonic testing of steel castings (with ferritic structure) for general purposes, and the methods for determining internal discontinuities by the pulse-echo technique. 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.