We can supply all kinds of high purity gas, such as oxygen,argon, nitrogen, CO2, helium, etc. ... processingnitrogen≥99.5GB-T3864-1996bottle/cylinderReplacement gas and protection gas for chemical industry, metallurgy, and electric industry.hydrogen≥99.9GB-T3634- ... stainless steel smelting, container, steel structure manufacture, mold processing, etc. High purity argon gas