1.1 本规范涵盖预应力混凝土储罐和类似结构施工中使用的无涂层、高强度、冷拔钢丝。在应用中，通过使用拉丝模具或机械张紧系统的装置将钢丝连续缠绕在结构上，以保持张力，而无需重新拉拔。 1.2 本规范仅适用于交付给买方的电线状况。它不适用于涂覆后导线的特性或状况。 1.2.1 A型钢丝通过拉丝模拉拔或通过机械系统张紧，无需重新拉拔。 1.2.2 B型钢丝由制造商拉至成品直径，以便通过机械系统张紧，无需重新拧紧- 绘画 注1: A型钢丝在通过模具拉伸时，如果买方不确保钢丝表面在应用过程中没有锈蚀和异物，则可能无法正常工作，这些异物可能会对良好的拉丝实践有害。此外，买方应确保遵循适当的拉丝技术，包括适当的润滑、冷却和适当的模具机械。 1.3 本规范的正文引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表中的注释和脚注）不应视为本规范的要求。 1.4 本规范适用于英寸磅单位（如规范A821）或国际单位制（如规范A821M）的订单。 1.5 以英寸-磅单位或国际单位表示的数值应单独视为标准值。在文本中，国际单位显示在括号中。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。合并两个系统的值可能会导致不符合规范。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers uncoated, high-strength, hard-drawn steel wire for use in the construction of prestressed concrete tanks and similar structures. In application, the wire is continuously wrapped on the structure maintaining tension by a device using a wire drawing die, or mechanical tensioning system without re-drawing. 1.2 This specification is applicable only to the condition of the wire as delivered to the purchaser. It is not applicable to the properties or condition of the wire after application. 1.2.1 Type A wire is to be tensioned by drawing through a wire drawing die or by a mechanical system without re-drawing. 1.2.2 Type B wire is drawn to finished diameter by the manufacturer for tensioning by a mechanical system without re-drawing. Note 1: Type A wire, when tensioned by drawing through a die, may not function properly if the purchaser does not ensure that during application the surface of the wire is free of rust and foreign materials that can be detrimental to good wire drawing practice. Further, the purchaser should ensure that proper wire drawing techniques are followed, including adequate lubrication, cooling, and proper die mechanics. 1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification. 1.4 This specification is applicable for orders in either inch-pounds units (as Specification A821) or in SI units (as Specification A821M). 1.5 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. 1.6 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.