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Xi'an Shew-E Steel Pipe Co.,Ltd is one of the leading st37.4 honed pipe suppliers and also a famous such manufacturer, equipped with many professional st37.4 honed pipe factories, welcome to purchase high quality st37.4 honed pipe from our company. Standard: DIN1630 Materials: St37.4 Technical: cold-draw seamless Delivery Condition:BK.BKW,BK+S,GBK,NBK Straightness: 0.5mm/1m max for tubes below 3m,0.8mm/1m max for tubes between 3 to 6m, 1.2mm/1m for tubes above 6m Technology:honed & SRB(Skived and Roller Burnished). Application: used in the hydraulic cylinder of the Heavy Machinery, Cranes, Excavator and Forklifts.