... , Annealing, OD: 1/4"-12" Executive Tube Standard: JIS G3461 Carbon steel boiler and heat-exchanger ... tube Product particular communication: 1) Size: OD > 6 ... Elongation), Technics Properties(Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, etc), Exterior Size Inspection, Nondestructive Test, Hydrostatic Test; 9) Main Applications ...