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High strength cylinder pipe

 


High strength cylinder pipe has high strength & tenacity, brittle fracture resistance and good weldability. S700 and S890 high strength cylinder pipes also have good hardenability and uniform performance after heat treatment. They are especially suitable for manufacturing high strength cylinders with large OD, medium & large wall thickness.

Application Fields

High strength cylinder pipe are mainly used for hydraulic support of coal collection face, hydraulic cylinder, engineering machinery, ship lock and offshore platform etc.

Production Range

  • OD: 42mm-760mm
  • WT: 4mm-120mm

Standard and Steel Grade

  • GB/T 8162
  • GB/T 8163
  • GB/T 17396 or technical agreement.
Requirements for Mechanical Properties
Steel GradeDelivery ConditionTensileYieldElongationR.A.Absorbed-engergy
(MPa)(MPa)(%)(%)(J)
Not Less Than
27SiMnQuenching+Tempering980835124020℃(AKU2)39
30CrMnSiAQuenching+Tempering1080835103520℃(AKU2)39
30CrMoAQuenching+Tempering930735125020℃(AKU2)71
20MnTiBQuenching+Tempering1050930104520℃(AKU2)50
S700Quenching+Tempering7506501440-20℃(AKV2)47
S890Quenching+Tempering8107001435-40℃(AKV2)60
Seamless pipe is used for supply or transportation of water, oil, gas and other liquids under the specification of seamless pipe (GB / T8163-1999).

Mechanical Properties(%) of GB/T8163 steel pipe

Standard codesModels of steel tubesTensite strength（MPa）Yield strength（MPa）Elongation（％）
GB/T816310335-475≥205≥24
20410-550≥245≥20
Q345490-665≥325≥21

Chemical Composition(%) of GB/T8163 steel pipe

Standard codesModels of steel tubesChemical compositions（％）
CSiMnPSCrNiCu
GB/T8163100.07-0.140.17-0.370.35-0.65≤0.035≤0.035≤0.15≤0.25≤0.25
200.17-0.240.17-0.370.35-0.65≤0.035≤0.035≤0.25≤0.25≤0.25
Q3450.12-0.200.20-0.551.20-1.60≤0.045≤0.045///
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