This standard specifies the basic parameters, materials, design, manufacture, test methods, inspection rules and signs, coating, packaging, transportation, storage, etc. of liquefied propylene and propane steel welded gas cylinders (hereinafter referred to as steel cylinders). This standard is suitable for use under normal ambient temperature (-40°C ~ 60°C), the hydraulic pressure test pressure is 3.8MPa (gauge pressure) and 3.3MPa (gauge pressure), the nominal volume is 10 ~ 150L, rechargeable Cylinders for liquefied propylene and propane.