1.1 本规范涵盖由额定应力高密度聚乙烯（HDPE）材料制成的坯料。 1.2 钢坯是通过将熔融的挤压材料涂敷在旋转心轴上以形成整体质量来制造的。取下芯轴可获得近似厚壁圆柱壳形状的坯料。尺寸标注前的机加工是可以接受的。 注1: 虽然本规范不可能解决与坯料制造相关的所有制造细节，但通过控制施加足够的热量，在一段时间内结合施加的力使熔融，可以实现HDPE的成功热熔粘接。 1.3 钢坯用于制造法兰接头和异径管等管件。 1.4 预制管件的要求和使用应符合适用的产品规范。本坯料规范不包括由坯料制造的物品的要求。 1.5 本规范包括选择适当额定应力材料的热塑性管道材料命名规范，以及钢坯的性能要求和确定符合要求的试验方法。 1.6 为制造商规定了最低质量控制措施。 看见 附件A1 用于符合本规范的钢坯的质量控制。 1.7 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8 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。 1.9 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 billets made from stress-rated high-density polyethylene (HDPE) materials. 1.2 The billets are manufactured by application of molten extruded material onto a rotating mandrel to form a monolithic mass. Removal of the mandrel provides a billet in the approximate shape of a thick-walled cylindrical shell. Machining prior to dimensioning is acceptable. Note 1: Although it is impossible to address all manufacturing details related to the fabrication of billets in this specification, successful heat fusion bonding of HDPE is obtained through controlled application of sufficient heat to cause melting in combination with applied force over a period of time. 1.3 The billets are intended for fabrication into pipe fittings such as flange adapters and reducers. 1.4 Requirements for and use of the fabricated pipe fittings shall be in accordance with an applicable product specification. This specification for billets does not include requirements for items fabricated from the billets. 1.5 This specification includes thermoplastic pipe material designation codes for selection of appropriate stress-rated material, together with performance requirements for billets and test methods for determining conformance with the requirements. 1.6 Minimum quality control measures are prescribed for manufacturers. See Annex A1 for quality control for billets conforming to this specification. 1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.8 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. 1.9 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.