1.1 本规范涵盖了用于预应力混凝土结构的两种类型和两种等级的三线无涂层钢绞线。两种类型的链是低松弛和应力释放（正常松弛）。低松弛将被视为标准型。除非特别订购，否则不会提供应力消除（正常松弛）股线。这两个等级是250[1725]和270[1860]。基于股线的标称面积，等级250[1725]和270[1860]分别具有250 ksi[1725 MPa]和270 ksi[1860 MPa]的最小拉伸强度。 1.2 本规范的文本包含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）不应作为规范的要求强制执行。 1.3 本规范适用于任何英寸的订单-磅单位（如规范A910）或SI单位（如规范A910M）。 1.4 以英寸-磅单位或国际单位制单位表示的值应单独视为标准值。在正文中，SI单位显示在括号中。每个系统中陈述的值并不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合规范。 1.5 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 covers two types and two grades of 3-wire, uncoated steel strand for use in prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation is to be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered. The two grades are 250 [1725] and 270 [1860]. Grades 250 [1725] and 270 [1860] have minimum tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa] respectively, based on the nominal area of the strand. 1.2 The text of this specification contains notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables) shall not be enforced as requirements of the specification. 1.3 This specification is applicable for orders in either inch-pound units (as Specification A910) or in SI units (as Specification A910M). 1.4 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 shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. 1.5 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.