Seamless Steel Honed/Honing Tube St52 DIN2391 for Hydraulic Cylinder

Product Description
Outer diameter:25mm -500mm
Wall thickness: 2-50mm
Material:ST52, ST35, ST45
Standard: GB/T8713-88, GB/T3639-2009, DIN2391, EN10305
Honed tubes can be produced according to the demands of costumers that the degree of precision can reach H8/H9. Burnishing and honing service can be provided depending on the roughness requirement of inner diameter.Material & Chemical Composition
DIN2391 standard ST52, EN10305 standard E355, 16Mn, ASTM A106B, C20/20#, CK45
Product NameSt35 steel pipeSt45 steel pipeSt55 steel pipeSt52 steel pipechemical analysisC:≤0.18; P:≤0.05; S:≤0.05C:≤0.25; P:≤0.05; S:≤0.05C≈0.36; P:≤0.05; S:≤0.05C:≤0.20; Si≤0.55;Mn≤1.5;P:≤0.05; S:≤0.05Tensile Strength+NBK,35-45MPa; +BK,≥45MPa;+BKW,≥38MPa;+GBK,≥32MPa+NBK,45-55MPa; +BK,≥55MPa;+BKW,≥48MPa;+GBK,≥40MPa+NBK,55-65MPa; +BK,≥65MPa; +GBK,≥50MPa+BK,≥60MPa;+BKW,≥55MPa;Yield strength+NBK,≥24M
Pa+NBK,≥26MPa+NBK,≥30MPa-StandardDIN2391-1LengthAs customer's requestPackagingStandard export packing, packed in woven bags, with two nylon slings, or can be customized as requestHeat Treatment/ Delivery ConditionCold finished (hard) BK(+C)
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
Cold finished (soft) BKW(+LC)
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)
Cold finished and stress-relieved annealing BKS(+SR)
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.
Annealed GBK(+A)
The last Cold forming process is followed by annealing in a controlled atmosphere.
Normalized NBK(+N)
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.Delivery TimeWithin 35-50 days from receiving depositPayment Term100% L/C at sight or 30% deposit, 70% balance against copy of B/LUsage/ApplicationPipes for automobile and motorcycleMain MarketAsia, Middle East, Europe, etc.Dimension toleranceInnerDia(mm)IDTolerance(mm)WTTolerance(mm)H7H8H9H10H1130+0.021/0+0.038/0+0.052/0+0.084/0+0.130/0±5-10%>30-50+0.025/0+0.039/0+0.062/0+0.100/0+0.160/0>50-80+0.030/0+0.046/0+0.074/0+0.120/0+0.190/0>80-120+0.035/0+0.054/0+0.087/0+0.140/0+0.220/0>120-180+0.040/0+0.063/0+0.100/0+0.160/0+0.250/0>180-250+0.046/0+0.072/0+0.115/0+0.185/0+0.290/0>250-315+0.052/0+0.081/0+0.130/0+0.210/0+0.320/0>315-400+0.057/0+0.089/0+0.140/0+0.230/0+0.360/0
Product descriptionProcessing FormI. DLengthStraightnessI. D ToleranceI. D RounghnessCold-rolled30-100≤ 12M0.3-1.0H8-H100.4-1.6Cold-drawn30-250≤ 12M0.3-1.00.8-1.6Hone40-500≤ 12M1000H8-H90.4-0.8SRB40-400≤ 7M1000H8-H90.1-0.4