1.1 本规范 2. 涵盖了轧制全镇静碳和合金钢板的直梁、脉冲回波、超声波检测的程序和验收标准， 1. / 2. 英寸[12.5毫米]及以上的厚度。它的开发是为了确保交付的钢板没有严重的内部不连续性，如管道、破裂或叠片，并且在询价、合同、订单或规范规定对钢板进行超声波检查时使用。 1.2 根据本规范进行检查的个人应根据最新版ASNT SNT-TC-1A或同等公认标准的要求进行资格认证。等效标准是指涵盖超声波无损检测候选人资格和认证的标准，并且是买方可接受的标准。 1.3 以英寸磅单位或国际单位制表示的数值应单独视为标准。在正文中，国际单位制显示在括号中。每个系统中规定的值并不完全相等，因此，每个系统必须独立使用。将两个系统的值组合在一起可能会导致不符合规范。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification 2 covers the procedure and acceptance standards for straight-beam, pulse-echo, ultrasonic examination of rolled fully killed carbon and alloy steel plates, 1 / 2 in. [12.5 mm] and over in thickness. It was developed to assure delivery of steel plates free of gross internal discontinuities such as pipe, ruptures, or laminations and is to be used whenever the inquiry, contract, order, or specification states that the plates are to be subjected to ultrasonic examination. 1.2 Individuals performing examinations in accordance with this specification shall be qualified and certified in accordance with the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard. An equivalent standard is one which covers the qualification and certification of ultrasonic nondestructive examination candidates and which is acceptable to the purchaser. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.