hydraulic tube/ DIN2391 / H8-H9 tolerance / BKS

hydraulic tube/ DIN2391 / H8-H9 tolerance / BKS

MATERIAL SPECIFICATION and STANDARD of HYDRAULIC TUBE 

                           Material: 20# 45#,16Mn st45, st52, 25Mn,27SiMn, SAE1026 

                           STANDARD: GB/T8713  GB/T3639   DIN2391  EN10305   ASTM A519

                   CHEMICAL COMPOSITION (%)

                                                           composition table of  hdyraulic tube grade st35,st42,st52  

                      MECHANICAL PROPERTY                   

                                    Mechanical Property of hydraulic tube in different grade

                    DELIEVER CONDITION   :  BK or BKS

                   Technical Index with different process

                          Inner surface of hydraulic tube for hydraulic cylinder   

                            Inner surface of hdyraulic tube for hydraulic cylinder   

                 TOLERANCES ON INTER DIA    ISO H8-H9

                  STRAIGHTNESS                                  ≤ 0.5 mm/M

                   ID TOLERANCE

                                     I.D TOLERANCE  

                    ENDS of hydraulic tube

                     APPEARANCE of hydraulic tube

                          Tube shall have a smooth internal and external surface consistent with cold working

                           process, tube inner surface should be free from rust, scratches and other surface

                           irregularities.

                     CERTIFICATION

                            Material certificates will be send.

                     PACKING Anti-rust oil to be applied on external and internal of hydraulic tube. Ends closed by plastic cap .  Bundled by steel  strips, packaged by weaving bag. 

                     SCOPE Hydraulic cylinder tube for swivel crane, injection machine and construction

                            machine application. 

                      Process Flow of hydrauylic tube(cold-drawn)

                       a.  Acid washing and cleaning 

                               b.  Cold drawn by Hydraulic cold drawing machine. To get higher precision pipe

                                c. Annealing. 

                               d.Straightening. Straightness ≤ 0.5 mm/M

                               e. multi-spindle vertical internal cylindrical honing machine

                             Inner surface Roughness: 0.4~0.8 Micron

                                f.   Inspect

                               g.Shipment

                                H. Usage