1.1 本试验方法描述了测定预应力混凝土管用冷拔钢丝抗氢脆（HE）能力的程序。 1.2 电阻是指在实验室测试的试样的失效时间。 1.3 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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。 ====意义和用途====== 4.1 预应力混凝土管中使用的冷拔钢丝可能暴露在有利于氢致脆化和开裂的元素氢中。预应力钢丝必须具有抗氢脆性能，才能为安装的管道提供长期性能。 4.2 应力钢丝试样暴露在NH热溶液中抵抗失效的时间长度 4. SCN表示试样的抗氢脆性。

1.1 This test method describes procedures to determine the hydrogen embrittlement (HE) resistance of hard-drawn steel wire used for prestressed concrete pipe. 1.2 HE resistance is reported as time-to-failure of specimens tested in a laboratory. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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. ====== Significance And Use ====== 4.1 Hard-drawn steel wire as used in prestressed concrete pipe may be exposed to elemental hydrogen favorable to hydrogen induced embrittlement and cracking. Resistance to hydrogen embrittlement is necessary for prestressing wire to provide long-term performance to installed pipe. 4.2 The length of time that a stressed wire specimen resists failure while exposed to a heated solution of NH 4 SCN, is an indication of the specimen's resistance to hydrogen embrittlement.