Steel Tube Handbook - 2018

77 Precision hydraulic tubes – HP –„ready to use“ Dimensions Dimensions and HP tube weight are given in Table 33/78. Tolerances • outside diameter according to standards DIN 2391-1, EN 10305-1, ČSN/STN 42 6712 • inside diameter – ISO H8, H9 – Table 33 • wall thickness ± 7,5 % or ± 10 % • eccentricity is included in the tolerances of wall thickness Lengths • random lengths 2 – 6 m • fixed lengths max. 6 m Straightness 1 mm / m (1 : 1000) – measured on outside surface. Tube ends Plain, upon request ends could be plugged with plastic caps. Steel grade • 11 523 according to STN, ČSN • St 52 (1.0580) according to DIN 2391, St 52-3 (1.0570) according to DIN 17100 • E 355 (1.0580) according to EN 10305-1 • 20 Mn V 6 according to EN 10294-1 (see pages 21, 114, 115) • another steel upon agreement Delivery condition BKS (+SR) - cold finished / stress relieve annealed. Other upon agreement (NBK, +N, BK, +C). Outside surface Smooth after cold drawing (DIN 2391). Inside surface Roughness Ra ≤ 0,4 µm, Rz ≤ 1,5 µm. Testing • cast analysis • tensile test • visual test • dimensional test • NDT (eddy current test) according to SEP 1925, EN 10246-1 or another agreed method • other tests upon agreement Marking Colour stencilling along whole tube length: • producer‘s logo • size (inside diameter x wall thickness) • steel • heat No. • standard number (or according to customer’s specification) • bundle with label with supplementary informations Surface protection Tubes are oiled. Packaging Tubes are packed in round or hexagonal bundles with weight max. 2 000 kg, fastened with steel strips. Certified test report According to EN 10204 - 3.1. Tubes for hydraulic and pneumatic cylinders - tubes ready to use