... -1995Bottle Steel cutting, welding, flame processingIndustrial nitrogen ≥99.5 GB-T3864-1996Bottle Replacement gas and protection gas for chemical ... 1996Bottle Welding, cutting, heating, organic raw materialsCutting gas ≥99.5 HG/T 3661.1-1999 Bottle Metals cutting, heating, ... deformation, heat treatment and the other flame processingpropylene ≥99.5 Q/DY-98Kg Welding, cutting Industrial argon ≥99.99 ...