27SiMn Hydraulic Cylinder Rolling TubeHoning tube and rolling tube inside and outside wall oxide layer,Website:http://www.leonhydraulic.com, to withstand high pressure without leakage, high-precision, high-quality finish, cold deformation, flaring, flattening without cracks a bit, so mainly used to produce pneumatic or hydraulic components products, such as cylinder or cylinders, which can be seamless. Product ParametersCylinder ID: 40-400mmWall thickness: 3-50mmMaterial: 20#  45#(CK45)  16Mn(ST52)  25Mn  27SiMn  Standard: GB/T8713-88 GB/T3639-2000 DIN2391 EN10305Processing formCylinder ID (mm)Length  (m)Straightness (mm/m)Tolerance    on IDRoughness (μm)Cold drawn30-250≤ 13m0.2-0.5H9-H110.8-1.6Cold rolling30-100≤ 12m0.2-0.5H9-H100.8-1.6Honed40-800≤ 7m0.2-0.3H7-H90.4-0.8Mechanical PropertiesSteel GradeTensile strength(σb N/mm2)Yield strength(σs N/mm2)Elongation(δ %)HardnessHB   20#≥520≥470≥1217545#(CK45)≥600≥520≥1220716Mn(ST52)≥600≥520≥1519025Mn≥600≥510≥1519527SiMn≥800≥720≥10230Dimension ToleranceSize of ID (mm)           ID ToleranceTolerance of wall thicknessH7 H8 H9 H10 H11 30+0.021 0+0.033 0+0.052 0+0.084 0+0.130 0±5%>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 0Product ProcessPacking & Shipping1.In bulk (Large OD)2.In bundle with steel strips (Small OD)3.With woven cloth4.A per customer's requirementsAbout USApplicationThe honing and finished rolling tube, have been widely used in many industries, such as hydraulic cylinder, petrochemical sand pumping vessel, shipping, construction machinery, mining machine, filling machine and agricultural machine,etc.