本文件规定了水容量不超过450升（含450升）的可再充装无缝钢制气瓶和管道的材料、设计、结构和工艺、制造工艺、制造过程、制造时的检查和测试的最低要求。 它适用于压缩、液化和溶解气体的钢瓶和管子，以及最大实际抗拉强度Rma小于1 100 MPa的淬火和回火钢瓶和管子。

This document specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examination and testing at time of manufacture for refillable seamless steel gas cylinders and tubes with water capacities up to and including 450 l. It is applicable to cylinders and tubes for compressed, liquefied and dissolved gases and for quenched and tempered steel cylinders and tubes with a maximum actual tensile strength R_ma of less than 1 100 MPa.