EN 12168:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Baker in bakrove zlitine - Votle palice za obdelavo z odrezovanjem na avtomatihKupfer und Kupferlegierungen - Hohlstangen für die spanende BearbeitungCuivre et alliages de cuivre - Barres creuses pour décolletageCopper and copper alloys - Hollow rod for free machining purposes77.150.30Bakreni izdelkiCopper productsICS:Ta slovenski standard je istoveten z:EN 12168:2011SIST EN 12168:2011en,fr,de01-oktober-2011SIST EN 12168:2011SLOVENSKI
STANDARDSIST EN 12168:1999/A1:2002SIST EN 12168:19991DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12168
June 2011 ICS 77.150.30 Supersedes EN 12168:1998English Version
Copper and copper alloys - Hollow rod for free machining purposes
Cuivre et alliages de cuivre - Barres creuses pour décolletage
Kupfer und Kupferlegierungen - Hohlstangen für die spanende Bearbeitung This European Standard was approved by CEN on 14 April 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Determination of mean depth of dezincification . 28A.1Introduction . 28A.2Procedure . 28A.3Expression of results . 28Bibliography . 30 Figures Figure 1 — Examples of hollow rod cross-sections . 8 Figure 2 — Measurement of twist of polygonal hollow rod . 14 Figure A.1 — Example of contiguous fields . 29
Tables Table 1 — Composition of low alloyed copper alloys . 17 Table 2 — Composition of copper-zinc alloys . 18 Table 3 — Composition of copper-zinc-lead alloys . 19 Table 4 — Composition of complex copper-zinc alloys . 20 Table 5 — Mechanical properties of low alloyed copper alloys . 21 Table 6 — Mechanical properties of copper-zinc alloys . 22 Table 7 — Mechanical properties of copper-zinc-lead alloys . 23 Table 8 — Mechanical properties of complex copper-zinc alloys . 24 Table 9 — Tolerances on external diameter or width across-flats . 25 Table 10 — Tolerances on wall thickness . 25 Table 11 — Tolerances on diameter of the bore . 25 Table 12 — Tolerances on eccentricity . 26 Table 13 — Tolerances on straightness of hollow rod . 26 Table 14 — Tolerances on length of hollow rod . 26 Table 15 — Corner radii for hollow rod with square, hexagonal or octagonal external shape . 26 Table 16 — Maximum twist for hollow rod with square, hexagonal or octagonal external shape . 27 Table 17 — Sampling rate . 27
D-89079 Ulm
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. CEN shall not be held responsible for identifying any or all such patent rights. SIST EN 12168:2011

(ISO 6892-1:2009) ISO 1190-1, Copper and copper alloys — Code of designation — Part 1: Designation of materials ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 hollow rod straight product, of uniform cross-section along its whole length with an enclosed void for which the longitudinal axes of its external contour and its internal contour, which is the boundary with the enclosed void, are coincidental NOTE The external and internal contours of the rod, at any cross-section, can be that of a circle, square, rectangle, hexagon, or octagon, or with slight modification of those basic shapes by inclusion of detail(s) of relatively small size to the remainder of the cross-section. Examples of hollow rod cross-sections are shown in Figure 1. SIST EN 12168:2011

Figure 1 — Examples of hollow rod cross-sections 3.2 deviation from circular form difference between the maximum and the minimum outside diameters measured at any one cross-section of the product NOTE Adapted from EN 12163:2011. 3.3 eccentricity difference between the maximum and the minimum wall thickness, measured in the same cross-section perpendicular to the axis of the hollow rod, expressed as a percentage of the sum of the maximum and minimum wall thicknesses (smax. and smin.): e = 100.min.max.min.max×+−ssss NOTE For polygons, wall thickness is measured perpendicular to the mid-points of the flat outside surfaces. 4 Designations 4.1 Material 4.1.1 General The material is designated either by symbol or number (see Tables 1 to 4). 4.1.2 Symbol The material symbol designation is based on the designation system given in ISO 1190-1. SIST EN 12168:2011

Material condition for a product which is stress relieved. NOTE Products in the M or H. material condition may be specially processed (i.e. mechanically or thermally stress relieved) in order to lower the residual stress level to improve the resistance to stress corrosion and the dimensional stability on machining [see 5 l), 5 m) and 8.4]. Except when the suffix S is used, material condition is designated by only one of the above designations. 4.3 Product The product designation provides a standardized pattern of designation from which a rapid and unequivocal description of a product is conveyed in communication. It provides mutual comprehension at the international level with regard to products which meet the requirements of the relevant European Standard. The product designation is no substitute for the full content of the standard. The product designation for products to this standard shall consist of: a) denomination (hollow rod); b) number of this European Standard (EN 12168); c) material designation, either symbol or number (see Tables 1 to 4); d) material condition designation (see Tables 5 to 8); e) external and/or internal cross-sectional shape (the following designations shall be used as appropriate: RND for round, SQR for square, RCT for rectangular, HEX for hexagonal, OCT for octagonal, PFL for profile); f) nominal cross-sectional dimensions (see NOTE 1 to Clause 5) or, for profiles, the number of the profile or a fully dimensioned and toleranced drawing, and: 1) tolerance class A, B or C added to the external dimension (see Table 9); and/or 2) tolerance class A or B added to the bore diameter (see Table 11); g) wall thickness (the following designation shall be used for wall thickness: WT) (see Table 10); SIST EN 12168:2011

Hollow rod EN 12168 — CuZn39Pb3 — H090 — RND40B × WT10
or
Hollow rod EN 12168 — CW614N — H090 — RND40B × WT10 EXAMPLE 2 Hollow rod for free machining purposes conforming to this standard, in material designated either CuZn39Pb3 or CW614N, in material condition H090, hexagonal external shape, 60 mm nominal width across-flats dimension, tolerance Class A, round bore of nominal diameter 20 mm, tolerance Class B sharp corners, shall be designated as follows:
Hollow rod EN 12168 — CuZn39Pb3 — H090 — HEX60A × RND20B — SH
or
Hollow rod EN 12168 — CW614N
— H090 — HEX60A × RND20B —SH Denomination Number of European Standard
Material designation
Material condition designation
Cross-sectional shape, nominal cross-sectional dimensions in millimetres, tolerance class for each dimension
Corner designation
5 Ordering information In order to facilitate the enquiry, order and confirmation of order procedures between the purchaser and the supplier, the purchaser shall state on his enquiry and order the following information: a) quantity of product required (mass); b) denomination (hollow rod); c) number of this European Standard (EN 12168); d) material designation (see Tables 1 to 4); e) material condition designation (see 4.2 and Tables 5 to 8) if it is other than M; f) nominal cross-sectional dimensions or, in the case of hollow profiles, by a fully dimensioned and toleranced drawing; SIST EN 12168:2011
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