Datong Hydraulic

  ST52 unhoned tubes   has been drawn but no surface finish process has taken place. Unhoned tube we can also call it cold drawn seamless tube or   ready to honed tubes . We offer a limited range of ST52 Cold Drawn Seamless and Hot Finished Unhoned Cylinder Tubes suitable for honing. The sizes offered are more machine specific. Made from ST52 &  E355 Cold drawn seamless  & hot finished tube Cylinder Tubes (Honed and Unhoned) Typical Chemical Composition % MIN MAX Carbon 0.25 Manganese 0.30 – 0.90 Phosphorous 0.40 Silicon 0.35 Sulphur 0.50 Mechanical Properties Tensile Strength Mpa Min 500 Yield Strength Mpa Min 400 Elongation Min 15 Datong Hydraulic  stock  largest range of ST52 Honed & ST52 Unhoned Cylinder Tubes. we have Advanced production equipment,High quality raw material,Strict quality control and Safe packing. pls contact us for more details if you have any inquiry.

 Heat treatment is necessary for H8 honed tubes in order to improve their mechanical properties and make them more suitable for their intended application. The heat treatment process involves heating the steel to a specific temperature and then cooling it down slowly, which can result in changes in its microstructure and properties. In H8 honed tubes, a continuous ans smooth surface can be obtained on the inner diameter thanks to the skiving and burnishing technique. H8 honed tubes that Datong Hydraulic produced are in EN10305 standards in various size and E355+SR（DIN2391 ST52 BK+S）quality standards and all of them are cold drawn and stress released. Material : E355 ST52 Delivery Condition : BK, BK+S, GBK, NBK ID Size  : 20mm – 1500mm Length : max 16m Type : Seamless, Hot Rolled, Cold Rolled, Cold Drawn Straightness : ≤ 0.5/1000 Roughness : 0.2-0.4 um Tolerance EXT : DIN2391, EN10305, GB/T 1619 Tolerance INT : H7,H8,H9 ADVANTAGES OF H8 HONED TUBE 1, High precision tolerances; Our hon

  Induction hardening   uses induced heat and rapid cooling (quenching) to increase the hardness and durability of steel. Induction hardening is a method of quickly and selectively hardening the surface of a metal part. A copper coil carrying a significant level of alternating current is placed near (not touching) the part. Heat is generated at, and near the surface by eddy current and hysteresis losses. Quench, usually water-based with an addition such as a polymer, is directed at the part or it is submerged. This transforms the structure to martensite, which is much harder than the prior structure. It is a no-contact process that quickly produces intense, localised, and controllable heat. Induction is being used to harden numerous components, such as gears, crankshafts,  cylinder bars , drive shafts, output shafts, torsion bars, rocker arms, CV joints, tulips, valves, rock drills, slewing rings. TYPICAL INDUCTION HARDENING MATERIALS Typical materials include: 1045 4140 4340 4130 THE