... 2.automatic progressive,high quality control system 3.ISO9001 2013 China best square steel tube bending Production Description Haiyan Hongtai ... sheet, stainlesssteel 304 2) surface treatment:Zinc , powder coat, hot-dip galvanized,blackening, electroplate…3) machining Process:Stamping , turning,tube ... -13646737163Tel :86-0573-86887878 Fax :86-0573-86887758 2013 China best square steel tube bending