25Mn DIN2391 Hydraulic Cylinder Hone TubeProduct Specification1.Types:honed tubes,Website:http://www.leonhydraulic.com,skived and roller burnished tubes2.Manufacture method: Cold rolled, Hydraulic cold drawn3.Internal surface treatment method: honing or skiving and roller burnishing.4.Size range:40mm*30mm-325mm*300mm5.Standard&material:EN10305-1 E355,C45E,34CrMo4,42CrMo4,DIN2391-2 ST52, ST52.3,ST52.4,ASTM A519 SAE1020,SAE1045,SAE1026,SAE4130,SAE4140,etc.6.Delivery condition:BK(+C),BKW(+LC),BKS(+SR),GBK(+A),NBK(+N).7.OD tolerance:as per DIN2391-1,EN10305-1,ASTM A519 or as per customer's requirement.8.ID tolerance: H7,H8,H9,H10 or given by customer.9.Roughness of internal surface: 0.35um max for honed tubes, 0.25um max for skived&roller burnished tubes.10.Wall Thickness tolerance (eccentricity):+/-5%Mechanical PropertiesSteel GradeTensile strength(σb N/mm2)Yield strength(σs N/mm2)Elongation(δ %)Hardness HB   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 & DeliveringAbout 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.