ST52 Honed Tube

ST52 E355 Seamless Hone Tube Product Specification 1. Standard specification&material: EN10305-1 E355 and equivalent standard and material like DIN2391-2 ST52. 2. Size range: 40mm*30mm - 480mm*450mm 3. Manufacture method: cold rolled,Website:http://www.leonhydraulic.com, hydraulic cold drawn 4. Delivery condition:  BK BKW BKS GBK NBK +C +LC +SR +A +N 5. Internal surface treatment method: honing or skiving and roller burnishing 6. OD tolerance: as per EN10305-1 7. ID tolerance: H7,H8,H9,H10 or given by customer. 8. W.T tolerance(eccentricity): +/-5% 9. Bore roughness(Ra): 0.35um max. Mechanical Properties Chemical composition requirement of E355 material: Element C Si Mn P S Content (%) 0.22% max 0.55% max 1.60% max 0.025% max 0.025% max Mechanical properties of E355 tubes: BK BKW BKS GBK NBK Tensile strength: 640 Mpa min 580 Mpa min 580 Mpa min 450 Mpa min 490Mpa-630Mpa Yield strength - - 450 Mpa min -  355 Mpa min Elongation 4% min 7% min 10% min 22% min 22% min Dimension Tolerance Size of ID (mm)            ID Tolerance Tolerance of wall thickness H7 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 0 Our Advantages  1): Durable, strict quality management and control, we are an ISO9001 enterprise. 2): High precision machining equipment guarantee good quality. 3): Smooth surface. No defects. Continuous skill  improvements. 4): We have design team to develop new skill and new products to meet customer’s      requirements  5): Good after-service, when customers have problems during use, we will surely try our best to solve them. 6): High professional employees have good emergency-dealing ability during production. 7): Surface treatment can be nickel, galvanized and painted, or based on the requirements of customers. Packing & Shipping 1. In bulk (Large OD) 2. In bundle with steel strips (Small OD) 3. With woven cloth 4. A per customer's requirements About US Application The 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.



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