用于石油和天然气工业的耐腐蚀螺栓（第二版；2018年11月1日生效

[中文适用范围]： 目的 本标准规定了石油和天然气工业中使用的耐腐蚀螺栓的资格、生产和文件要求。适用性 当适用的 API 设备标准引用或以其他方式指定为合规性要求时，本标准适用。 [外文原描述]： This standard specifies requirements for the qualification, production and documentation of corrosion resistant bolting used in the petroleum and natural gas industries. This standard applies when referenced by an applicable API equipment standard or otherwise specified as a requirement for compliance. This standard establishes requirements for two bolting specification levels (BSL). These two BSL designations define different levels of technical, quality, and qualification requirements: BSL-2 and BSL-3. The BSL are numbered in increasing levels of requirements in order to reflect increasing technical, quality, and qualification criteria. BSL-2 and BSL-3 are intended to be comparable to BSL-2 and BSL-3 as found in API 20E. BSL-1 is omitted from this standard. This standard covers the following product forms, processes, and sizes: a) machined studs; b) machined bolts, screws and nuts; c) cold formed bolts, screws and nuts with cut or cold formed threads; d) hot formed bolts a