This standard specifies the basic parameters, technical requirements, test methods, inspection rules and signs, packaging, transportation, storage, etc. of steel welded gas cylinders (hereinafter referred to as steel cylinders). This standard applies to steel cylinders with a nominal volume of 10 to 1000L that can be refilled with low-pressure liquefied or dissolved gases, used at normal ambient temperatures (-40 to 60°C), with a hydrostatic test pressure not greater than 7.5 MPa (gauge pressure) . This standard is also applicable to steel cylinders that are repeatedly filled with industrial liquefied petroleum gas specified in GB11174.