本文件规定了ISO？13623中定义的石油和天然气行业管道运输系统中使用的非合金或低合金钢无缝和焊接管道配件的交货技术条件。 本文件适用于焊接端部配件，如弯头、管帽、三通、单个或多个挤压集管、异径管和由非合金或低合金钢无缝和焊接管道制成的过渡段。 本文件规定了两类配件，一类与非酸性环境中使用的材料有关，另一类用于酸性环境中使用的材料，如表1所示。 本文件不适用于配件类别的选择。 本文件不适用于工厂的材料或附件- 焊接延长件。

This document specifies the technical delivery conditions for unalloyed or low-alloy steel seamless and welded pipeline fittings for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO？13623. This document is applicable to welding-end fittings such as elbows, caps, tees, single or multiple extruded headers, reducers, and transition sections made from seamless and welded pipe of unalloyed or low-alloy steels. This document specifies two classes of fitting one related to material used in non-sour service and one for material to be use in sour service environment as shown in Table？1. This document is not applicable to the selection of the fitting class. This document is not applicable to the materials for, or the attachment of, factory-welded extensions.