1.Seamless steel tube and carbon tube, seamless pipe Widely used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT, ST52, CK45 and AISI 1020. We can also offer as customized seamless steel tube. 2.cold drawn steel tube/cold rolled steel tube, cold drawn pipe, cold rolled pipe, cold drawn tube, cold rolled tube Grade: 20# 45# 16Mn 25Mn 27SiMn E355 ST52 STKM11A STKM13A ST52 S45C CK45 Standard: GB/T8713 GB/T3639 DIN2391 EN10305 ASTMA519 Range: 30-300mm Length: 11m(max) The cold process can change the thickness of tube to meet client's request and offer better mechanical property. 3. Honed steel tube&SRB steel pipe, honed tube, honed tubes, honed steel pipe, honed pipe ID Tolerance: H8 H9 ID Roughness: RA0.4micron(max) Length: 6m(max) Inner roughness: Ra0.2-0.8um Straightness: 1:1000 or customized This process can improve the roughness of the inner tube to 0.2-0.8um and make inside tube more smooth which can be used for cylinder directly. 4.hydraulic cylinder steel tube, hydraulic tube, cylinder tube, hydraulic pipe, cylinder pipe (1)Product Name ST52 Hot Sale Cold Rolled Steel Pipe E355 Honed Tube (2)Material Carbon Steel Tube (3)Outer Diameter 30-250mm (4)Wall Thickness 2-30mm (5)Material Grade ST52,E355,CK45,A106,A53,SKTM11A,STKM13A,STKM13C,S45C,and so on (6)Delivery Condition BK/BKS/GBK/NBK (7)Delivery time within 20-30 days after receiving prpayment (8)Trade Terms FOB Yantai, Qingdao or any other China main port