EN 10305-4-2016 pdf download.Steel tubes for precision applications – Technical delivery conditions – Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems.
• Option 33: Protection by galvanization and chrornatization, type blue-white (see 13.1);
• Option 34: Protection by galvanization and chromatization, type yellow (see 13.1);
• Option 35: Protection by galvanization and chromatization, type olive green (see 13.1);
• Option 36: Protection by galvanization and passivation (type Cr (VI) free) (see 13.1);
• Option 37: Protection of tube ends (see 13.1);
• Option 38: Unbundled tubes or specific method of packaging (see 13.2).
6.3 Example of an order
1 000 m tubes with an outside diameter of D = 20 mm and a wall thickness of T 2.5 mm in accordance with this document, made of steel grade E235, delivered in standard lengths, protected by phosphatization and with an inspection certificate 3.1 in accordance with EN 10204:2004:
1 000 m tubes — D 20 x T 2,5 — EN 10305-4 — E235 — standard length — option 31 — inspection certificate 3.1
7 Manufacturing process
7.1 Steelmaking process
The steel making process is at the discretion of the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process.
Steels shall be fully killed.
NOTE This excludes the use of rimming, balanced or semi-killed steel.
7.2 Tube manufacture and delivery conditions
7.2.1 The tubes shall be manufactured from hot finished seamless hollows by cold drawing.
The tubes shall be delivered in the delivery condition +N which means that after the final cold drawing operation the tubes are normalized in a controlled atmosphere.
7.2.2 All non-destructive testing (NDT) activities shall be carried out by qualified and competent level
1, 2 and/or 3 personnel authorized to operate by the employer.
The qualification shall be in accordance with ISO 11484:2009 or, at least, an equivalent to it.
It is recommended that the level 3 personnel be certified in accordance with EN ISO 9712 or, at least, an equivalent to it.
The operating authorization issued by the employer shall be in accordance with a written procedure. NDT operations shall be authorized by a level 3 NDT individual approved by the employer.
NOTE The definition of level 1, 2 and 3 can be found in appropnate standards, e.g. EN ISO 9712 and ISO 11484:2009.
8 Requirements
8.1 General
The tubes, when Inspected in accordance with Clauses9, 10, and 11, shall comply with the requirements of this document.
In addition, the general technical delivery requirements specified in EN 10021 apply.
8.2 Chemical composition
The cast analysis reported by the steel producer shall apply and comply with the requirements of Table 1.
NOTE When subsequently welding tubes produced in accordance with this document, It Is important to take account of the fact that the behaviour of the steel during and after welding is dependent not only on the steel composition and the delivery condition but also on the conditions of preparing for and carrying out the welding.
8.4 Appearance and soundness
8.4.1 The internal and external surface finish of the tubes shall be typical of the manufacturing process and, where applicable, the heat treatment employed.
Option 4: A surface condition suitable for special further processing is specified by the purchaser.
Normally, the finish and surface condition shall be such that any surface imperfections requiring dressing can be identified. Any surface imperfections, which in accordance with the manufacturer’s experience might be considered defects as specified in 8.4.4, shall be dressed in accordance with 8.4.5, or the tube or part of tube shall be rejected.
8.4.2 The tubes shall have smooth outer and inner surfaces with a roughness Ra ≤ 4 im, unless option
7 is specified.
NOTE In the case of the inner surface, this requirement applies to inside diameters ≥ 15 mm.
EN 10305-4:2016 (E)
Option 7: A roughness of Ra ≤ 2 pm is specified for the inner surface.
8.4.3 Verification of surface roughness and/or improved levels of roughness may be specified (see option 8).
Option 8: The surface roughness shall be measured in accordance with 11.4 and reported.
8.4.4 Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this document.
8.4.5 It shall be permissible to dress, only by grinding or machining, surface imperfections provided that, after doing so, the wall thickness in the dressed area is not less than the specified minimum wall thickness. All dressed areas shall blend smoothly into the contour of the tube.EN 10305-4-2016 pdf download.
EN 10305-4-2016 pdf download
PS:Thank you for your support!
