... ≥99.5GB-T3863-1995bottle/cylinder Steel cutting, welding, flame processingnitrogen≥99.5GB-T3864-1996bottle/cylinderReplacement gas ... stone.CO2≥99.8GB-6052-85bottle/cylinderChemical industry, welding, casting moldHelium≥99GB/4844-95bottle/cylinderElectronic industry, ... analysis Pure argon ≥99.99 GB/T4842-95Bottle Welding shielded welding, stainless steel smelting, container, steel structure manufacture, ...