按照本规范制造的锻件用于制造海洋结构物、海洋立管、TLP钢筋束和管道，或用于永久性海洋结构物的其他系统部件。本规范规定了碳钢和低合金钢锻件的制造、测试和检验的最低要求，包括用于主要钢应用的345 N/mm2至586 N/mm2（50 ksi至85 ksi）等级的挤压件和厚壁无缝管产品。服务类别A、B和C（SCA、SCB和SCC）反映了锻造几何结构和并入整个系统的方法，而不是关键性级别。 用户（买方）也可以指定它们，以反映适度不同但标准化的性能水平。

Forgings manufactured to this specification are intended for use in the fabrication of offshore structures, marine risers, TLP tendons and pipelines, or other system components intended for application on permanent offshore structures. This specification defines the minimum requirements for manufacture, testing, and inspection of carbon and low-alloy steel forgings, including extrusions and heavy-wall seamless tubular product, grades 345 N/mm2 to 586 N/mm2 (50 ksi to 85 ksi) for use in primary steel applications.Service categories A, B, and C (SCA, SCB, and SCC) reflect forging geometry and method of incorporation into the overall system, rather than levels of criticality. They may also be designated by the user (purchaser) to reflect moderately different but standardized levels of performance.