Steel Tube Handbook - 2018

75 Precision tubes for mechanical treatment – HPZ Dimensions Dimensions of HPZ tubes are given in Table 32/Page 76. Tolerances • outside diameter according to standards DIN 2391-1, EN 10305-1, ČSN/STN 42 6712 • inside diameter – Table 32 • wall thickness ± 7,5% • eccentricity is included in the tolerances of wall thickness Lengths • random lengths 3–6 m • fixed lengths max. 6 m Straightness 1 mm/m (1 : 1 000) – 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 according to DIN 2391, St 52-3 according to DIN 17100 • E 355 according to EN 10305-1 • 20 Mn V 6 according to EN 10294-1 • another steel upon agreement Delivery condition BKS (+SR) – cold finished / stress relieve annealed. Other conditions upon agreement. Outside diameter Smooth after cold drawing (DIN 2391). Testing • cast analysis • tensile test • visual test • dimensional test • NDT (eddy current test) • other tests upon agreement Marking Colour stencilling along whole tube length: • producer‘s logo • size (D – d) • steel • heat No. • standard number (or according to customer’s specification) Surface protection Tubes are oiled. Packaging Tubes are packed in round or hexagonal bundles with weight max. 2000 kg, fastened with steel strips. Certified test report According to EN 10204 - 3.1. Tubes for hydraulic and pneumatic cylinders

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