本部分规定了淬火后回火处理的抗拉强度小于1 100 MPa的钢质无缝气瓶（以下简称钢瓶）的型式和参数、技术要求、试验方法、检验规则、标志、涂敷、包装、运输、储存、产品合格证和批量检验质量证明书。本部分适用于设计、制造公称工作压力不大于30 MPa，公称水容积为0.5 L～150 L，使用环境温度为-40 ℃～60 ℃，用于盛装压缩气体、高压液化气体或混合气体的可重复充装的钢瓶。本部分不适用于车用气瓶和机器设备上附属的瓶式压力容器。?注： 对于公称水容积小于0.5 L的钢质无缝气瓶也可参照本部分进行制造及检验。

This part of GB/T 5099 specifies minimum requirements for structure and parameter,technical requirements,test method,test and inspection rule,marking,coating,package,transportation and storage,product certificate and batch inspection quality certificate of quenched and tempered seamless steel cylinders(hereinafter referred to as steel cylinders)with tensile strength less than 1 100 MPa. This part of GB/T 5099 is applicable to refillable steel cylinders of design and construction with nominal working pressure not greater than 30 MPa,nominal water capacities of 05 L to 150 L and service temperature with range of -40 ℃ to 60 ℃,which is used for filling compressed gas,highpressure liquefied gas or gas mixture. This part of GB/T 5099 does not apply to the gas cylinder for vehicle and cylindrical pressure vessel attached to machines and equipment.