HPL Tubes. Seamless Precision Steel Tubes for Hydraulic and Pneumatic Pressure Lines

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1 HPL Tubes Seamless Precision Steel Tubes for Hydraulic and Pneumatic Pressure Lines

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3 HPL Tubes Hydraulic-pneumatic pressure lines Mannesmann Precision Tubes As a leading European manufacturer of cold-drawn seamless and welded precision steel tubes, the Mannesmann Precision Tubes Group offers a wide range of products, quality and services with great scope for intelligent, tube-related solutions. Synergistic effects as a result of our cooperation within the Salzgitter Group guarantee outstanding efficiency and achievements. An approved, integrated quality management system in accordance with ISO 9001, IATF and ISO 14001, ensures continuously high quality standards from the pre-material to the ready to dispatch precision tube. General Information HPL tubes are seamless cold-drawn precision steel tubes predominantly used as pressure lines in hydraulically or pneumatically operated equipments. For installation purposes both permanent and non-permanent connections are available. In hydraulic systems the velocity and pressure of the flow are subject to variations. The resulting pressure surges are superimposed on the internal pressure. Accordingly, pulsating stresses are prevalent in pressure lines. When designing the tubes for such lines, the actual stress profile under service conditions must be carefully considered. Measurements and requirements in this brochure are harmonized with EN Seamless cold-drawn tubes for hydraulic and pneumatic power systems, which defines the technical delivery conditions. Dimensions The selection of sizes shown in Table 1 is in accordance with EN Steel tubes for precision applications Technical delivery conditions Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems and DIN , Seamless steel tubes for dynamic loads; cold drawn tubes, nominal pressures 100 to 500 bar and also takes into account established dimensions in hydraulic and pneumatic engineering practice. For new constructions we recommend using the standardized dimensions (DIN 2445) Highlighted in grey in the manufacturing range of Table 1. Deviation Limits Outside and inside as shown in Table 1. Straightness in accordance with EN If tubes are ordered by outside and wall thickness, the eccentricity is max. 7.5 %. The tubes are supplied in exact lengths of 6,000 mm -0/+10 mm. Shorter lengths than 4,000 mm are bundled separately. Steel grades HPL tubes in accordance with EN are supplied in steel grades E 235 or E 355. Technical delivery conditions The tubes are normalized (+N) under controlled atmosphere in accordance with EN

4 Product Range dimensions, tolerances and flow cross section HPL Tubes Table 1: Product range, dimensions, tolerances and flow cross section Outside Inside Wall thickness Flow crosssection mm mm mm mm mm mm 4 +/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Standard dimensions according to DIN Outside Inside Wall thickness Flow crosssection mm mm mm mm mm mm 16 +/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Other dimensions on request. 4

5 Product Range dimensions, tolerances and flow cross section HPL Tubes Outside Inside Wall thickness Flow crosssection mm mm mm mm mm mm 25 +/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Standard dimensions according to DIN Outside Inside Wall thickness Flow crosssection mm mm mm mm mm mm 42 +/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Other dimensions on request. 5

6 Wall thickness calculations Dimensioning of wall thickness Wall thickness calculations for steel tubes under internal pressure are in accordance with DIN 2413 Part 1. Material data for seamless tubes under pulsating loads can be taken from DIN 2413 Part 1, paragraph A selection of tube dimensions for design pressures p s from 100 to 500 bar is contained in DIN 2445 Sheet 2. As pressure surges must be expected in Table 2: Dimensions, Load case A for load range p s ± 60 bar p s + 60 p s p s - 60 t Tube outside Resulting wall thickness at a given operating pressure p s 100 bar 160 bar 250 bar 315 bar 400 bar 500 bar mm mm mm mm mm mm mm Given values refer to the calculation of straight tubes. For bent tubes, a calculation in accordance with DIN 2413, Part 2 must be carried out if necessary. 6

7 Wall thickness calculations hydraulic systems, creep rupture and fatigue rupture stresses must be duly considered in design calculations. DIN 2413 Part 1 and supplement 1 to DIN 2445 contain corresponding calculation instructions for the determination of the wall thicknesses. Table 3: Dimensions, Load case B for stress ranges from 0 to p s + 60 bar Tube outside Resulting wall thickness at a given operating pressure p s 100 bar 160 bar 250 bar 315 bar 400 bar 500 bar mm mm mm mm mm mm mm p s + 60 p s t Given values refer to the calculation of straight tubes. For bent tubes, a calculation in accordance with DIN 2413, Part 2 must be carried out if necessary. 7

8 General Information Cold workability HPL tubes obtain a good cold formability by their final heat treatment. When bending is performed, the corresponding reduction of wall thickness and out-of-roundness in the bending area must be taken into consideration. The corresponding reduction factors for the design of bends and oval cross sections are given in DIN 2413 Part 2. Weldability The tubes are weldable without preheating and post-treatment with conventional procedures. Surface conditions In accordance with EN the tubes show a smooth inside and outside surface and a roughness of Ra 4 μm. High performance passivation High performance passivated as well as thick layer passivated HPL tubes are both galvanised at the outside with zinc coating of 8 to 12 μm and subsequently passivated. Other coating thicknesses and outside s > 42 mm on request. Mannesmann Precision Tubes-high performance passivation provides chrome VI-free coatings, in full compliance with the European directive 2000/53/EG. High performance passivated tubes have a transparent and colorless appearance. The resistance to white rust (salt spray test ISO 9227) is 200 h (this value applies to straight pipe sections and decreases by deformation). White rust is a white layer which forms on zinc surfaces (galvanized parts) that are stored in an insufficiently ventilated environment. The loose white rust forms no protection. Red rust is a corrosion product which forms during atmospheric corrosion of iron. Rust appears in a black or brown to red color and a loose, porous condition. Passivation layer (ca. 0,25 0,8 mm) Zinc layer (ca mm) Tube surface White rust Without further specification the coating and testing will be done according to ISO The description according to ISO 2081 should be given as in the following example: Galvanic Coating ISO 2081-Fe/Zn8/A Red rust This example specifies a galvanic zinc coating on ferrous material (Fe) with a minimum coating thickness of 8 μm (Zn8) with a transparent and colorless appearance (A). 8

9 Temporary Corrosion Protection All tubes are provided with a (inhibitor containing) mineral oil as temporary corrosion protection: HPL Tubes, black 2 mm di < 6 mm: internal and external surface oiled di 6 mm: internal and external surface oiled or internal and external phosphatized and oiled HPL pipes, galvanized: with an OD < 8 mm or ID 4 mm: ungreased, unoiled with an AD > 8 mm or ID > 4 mm: oiled outside and inside Table 5: Chemical composition 1) Steel grade C Si Mn P S % % % % % E E ) Minimum Al total content is controlled for both steel grades, except for additives of nitrogen binding elements, e. g. Nb, Ti and V, which are permitted at the discretion of the manufacturer. The content of these elements shall be reported. Table 6: Mechanical properties at (room temperature) 2) Steel grade Tensile strength Yield strength Elongation R m R eh A MPa MPa % min min E E ) For tubes with outside D 30 mm and wall thickness T 3 mm, the ReH minimum values are 10 MPa lower than the values given in this table. 9

10 General Information Marking Continuous full-length marking is applied to all tubes, including the following: Manufacturer Type of tube Size Delivery standard Steel grade Delivery condition Batch number Addition Country of Origin Marking Example: MPT-BR HPL 10x1 EN E235 +N Cr6-frei Germany Testing Without further specification, the HPL tubes will be tested by specific inspections in accordance with EN This includes mandatory destructive and non-destructive tests. Additional optional or non-specific inspections on request. Inspection certificates HPL tubes are supplied with a mill certificate 3.1 or 3.2 upon request. Tube ends Standard: ends square cut, unmachined. Exception: Tubes with high performance passivation with an outside < 8 mm respectively inside 4 mm: ends pinched, i. e. the ends are sheared and slightly oval. End seal (only for non-pinched-off ends) Tubes with inside s 4 mm are sealed with plastic caps. Tubes with inside s > 4 mm are sealed with plastic plugs. Tubes 42 mm outside and lengths different from / - 0 mm are delivered with unlocked ends; the ends are protected with blue plastic bags. Packaging Tubes with outside s 15 mm are packed in hexagonal steel-strapped bundles containing a fixed number of tubes per size. Extra quantities, short lengths and tubes in outside s <15 mm are packed in standard bundles. Other types of packaging (e. g. crates, cardboard tubes) on request. Packaging in crates is usually necessary for thin-walled tubes, high-quality products such as fuel-injection tubes or grinded tubes as well as for overseas shipments. General terms of sale Please note that our general terms and conditions of sale and payment are exclusively valid. You can find them on the internet under or receive a hardcopy from us on request. 10

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12 Mannesmann Precision Tubes GmbH Wiesenstrasse Mülheim an der Ruhr, Germany Automotive Mannesmann Precision Tubes GmbH Wiesenstrasse Mülheim an der Ruhr, Germany Phone: Fax: Mannesmann Precision Tubes France SAS ZI La Saunière Saint-Florentin, France Phone: Fax: automotive.mptfr@mannesmann.com Mannesmann Precision Tubes Mexico S.A. de C.V. Parque Industrial el Salto Calle A No El Salto/Jalisco, Mexico Phone: Fax: automotive.mptmx@mannesmann.com Industry and Energy Mannesmann Precision Tubes GmbH Wiesenstraße Mülheim an der Ruhr, Germany Phone: Fax: industry.mpt@mannesmann.com energy.mpt@mannesmann.com Mannesmann Precision Tubes France SAS Avenue Jean Juif Z.I. Marolles Vitry Le François, Frankreich Phone: Fax: industry.mpt@mannesmann.com energy.mpt@mannesmann.com Mannesmann Precison Tubes Netherlands B.V. Engelseweg AD Helmond, Netherlands Phone: Fax: industry.mpt@mannesmann.com energy.mpt@mannesmann.com Mannesmann Precision Tubes GmbH, HPL Tubes Seamless Precision Steel Tubes for Hydraulic and Pneumatic Pressure Lines, 002 E 9.18