钢. 厚度大于等于6 mm的扁钢制品超声试验

[中文适用范围]： 本国际标准规定了用于检测钢制平板产品内部不连续性的超声波脉冲反射法。适用于厚度为6毫米及以上的低碳和低合金钢制平板产品。然而，对于奥氏体钢或奥氏体-铁素体型钢制平板产品的超声波检测也可使用本标准，前提是噪声信号幅度与检测门限值之间的差异足以满足规定的要求。除非另有约定，本标准不适用于检测用于焊接钢管的钢制平板。 [外文原描述]： ISO 17577:2016 specifies a method for the automated and/or manual ultrasonic testing of uncoated steel flat products for internal discontinuities by the pulse echo technique. It is applicable to non-alloyed or alloyed steel flat products, in a nominal thickness range of 6 mm to 200 mm. However, this International Standard may be applied to austenitic and austenitic-ferritic steels, provided that the difference between the amplitude of the noise signal and that of the echo detection threshold is sufficient for the limit fixed. Unless otherwise agreed, for testing of steel flat products for welded steel tubes, ISO 10893‑9 applies. Other techniques of testing (e.g. by transmission) or other test equipment may be used at the manufacturer's discretion, provided that they give identical results to those obtained under the conditions of this International Standard. In the event of a dispute, only the method defined in this International Standard will prevail. Testing of flat products, of thickness less than 6 mm and over 200 mm, may be the subject of special agreements between the parties concerned. Testing is normally carried out in the place of production or on the premises of the supplier.