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BRITISH STANDARD BS EN851:1996Aluminium and aluminium alloys Circle and circle stock for the production of culinary utensils SpecificationsThe European Standard EN 851:1995 has the status of aBritish StandardBS EN 851:1996Committees responsible for thisBritish StandardThe preparation of this British Standard was entrusted to Technical Committee NFE/35, British light metals and their alloys, upon which the following bodies were represented:Aluminium FederationAluminium Stockholders AssociationLondon Metal ExchangeMagnesium Industry CouncilThe following bodies were also represented in the drafting of the standard, through subcommittees and panels:Association of British Welded Aluminium Tube MakersAssociation of Light Alloy Refiners LimitedInstitution of Structural EngineersMetal Packaging Manufacturers AssociationThis British Standard, having been prepared underthe direction of the Engineering Sector Board, was publishedunder the authority of the Standards Board and comes into effect on15 April 1996 BSI 10-1999The following BSI references relate to the work on this standard:Committee reference NFE/35Draft for comment 92/46374 DCISBN 0 580 25402 XAmd. No.DateCommentsAmendments issued since publicationBS EN 851:1996ContentsPage Committees responsibleInside front cover National forewordii Foreword 2Text of EN 8513List of referencesInside back cover BSI 10-1999iBS EN 851:1996National forewordThis British Standard has been prepared by Technical Committee NFE/35 and is the English language version of EN 851:1995 Aluminium and aluminiumalloys Circle and circle stock for the production of culinary utensils Specifications published by the European Committee for Standardization (CEN).Cross-referencesPublication referred to Corresponding British StandardBS EN 485 Aluminium and aluminium alloys Sheet, strip and plateEN 485-1:1993Part 1:1994 Technical conditions for inspection and deliveryEN 485-2:1994Part 2:1995 Mechanical propertiesEN 485-3:1993Part 3:1994 Tolerances on shape and dimensions for hot-rolled productsEN 485-4:1993Part 4:1994 Tolerances on shape and dimensions for cold-rolled productsEN 515:1993BS EN 515:1993 Aluminium and aluminium alloys Wrought products Temper designationsEN 602:1994BS EN 602:1995 Aluminium and aluminium alloys Wrought products Chemical composition ofsemi-products used for the fabrication of articles for usein contact with foodA British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BSI 10-1999iiEUROPEAN STANDARD NORME EUROPENNEEUROPISCHE NORMEN 851June 1995ICS 77.120.10; 77.140.90Descriptors: Aluminium, aluminium alloys, rolled products, manufacturing, kitchen utensils, blank, delivery, mechanical properties, dimensions, dimensional tolerances, roughnessEnglish versionAluminium and aluminium alloys Circle and circle stock for the production of culinary utensils SpecificationsAluminium et alliages daluminium Disques et bauches pour disques pour applications culinaires SpcificationsAluminium und Aluminiumlegierungen Ronden und Rondenvormaterial zur Herstellung von Kchengeschirr SpezifikationenThis European Standard was approved by CEN on 1995-02-08. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members.Ref. No. EN 851:1995 EEN 851:19957 BSI 10-1999ForewordThis European Standard has been prepared byContentsPageTechnical Committee CEN/TC 132, Aluminium and aluminium alloys, of which the secretariat is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995.According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.Foreword21Scope32Normative references33Definitions 33.1circle33.2circle stock33.3hot-rolled circle and circle stock33.4cold-rolled circle and circle stock34Technical conditions for inspectionand delivery34.1General34.2Orders or tenders35Mechanical properties45.1General45.2Earing 46Tolerances on dimensions and form46.1General46.2Diameter46.3Thickness 46.4Tolerances on flatness for circle46.5Edge burr tolerances for circle4Figure 1 Arch7Figure 2 Buckle7Figure 3 Edge burr8Table 1 Tolerances on diameter5Table 2 Thickness tolerances for hot-rolled circle and circle stock5Table 3 Thickness tolerances for cold-rolled circle and circle stock6Table 4 Material groups6Table 5 Flatness tolerances for circles67Other requirements41 ScopeThis standard specifies the particular requirements for wrought aluminium and aluminium alloys in the form of circle or circle stock for culinary utensil applications.This standard is applicable to: circles made out of hot or cold-rolled circle stock, with a thickness from 0,2 mm up to and including 12 mm and with a diameterfrom 100 mm up to and including 1 600 mm.NOTE Circles with a diameter up to 1 000 mm may be produced by blanking. hot or cold-rolled circle stock with a thickness from 0,2 mm up to and including 12 mm and with a width up to 1 600 mm.This standard is not applicable to slugs for impact extrusions which are dealt with in a separate European Standard.2 Normative referencesThis European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.EN 485-1, Aluminium and aluminium alloys Sheet, strip and plate Part 1: Technical conditions for inspection and delivery.EN 485-2, Aluminium and aluminium alloys Sheet, strip and plate Part 2: Mechanical properties.EN 485-3, Aluminium and aluminium alloys Sheet, strip and plate Part 3: Tolerances on dimensions and form for hot-rolled products.EN 485-4, Aluminium and aluminium alloys Sheet, strip and plate Part 4: Tolerances on dimensions and form for cold-rolled products.EN 515, Aluminium and aluminium alloys Wrought products Temper designations.EN 602, Aluminium and aluminium alloys Wrought products Chemical composition ofsemi-products used for the fabrication of articles for use in contact with food.3 DefinitionsFor the purposes of this standard all definitions ofEN 485-1 apply with the following additions:3.1 circlecircular flat product obtained by circular sawing or shearing, or by blanking of a flat rolled product with a uniform thickness over 0,20 mm3.2circle stockflat rolled product of rectangular cross-section with uniform thickness over 0,20 mm, supplied in coils, sheets or plates, usually with sheared or sawn edges, and intended to be sawn, sheared or blanked into flat shapes to be subsequently formed, drawn, etc.NOTE The thickness does not exceed one-tenth of the width.3.3hot-rolled circle and circle stockcircle or circle stock whose final thickness is obtained by hot-rolling3.4cold-rolled circle and circle stockcircle or circle stock whose final thickness is obtained by cold-rolling4 Technical conditions for inspection and delivery4.1 GeneralAll provisions of EN 485-1 shall apply, except for clause 4 (orders and tenders) which is modified as follows:4.2 Orders or tendersThe order or tender shall define the product required and shall contain the following information:a) the form and type of product: the form of the product (circle or circle stock); the designation of the aluminium or aluminium alloy; when subsequent decorative anodizing, anti-adhesive coating, enamelling, etc. by the customer is intended, this shall be expressly stated on the order. In all other cases, indication of the customer application is recommended;b) the metallurgical temper of the material for delivery according to EN 515 (degree of hardness or heat treatment condition) and, if different, the metallurgical temper for use;c) the number of this European Standard or a specification number, or, where none exists, the properties agreed between purchaser and supplier;d) the dimensions and shape of the product as applicable: thickness; diameter of the circle; width of the strip, sheet or plate; length of the sheet or plate; internal and external diameters of the coil;e) whether hot-rolled or cold-rolled tolerances apply;f) quantity: mass or number of pieces; tolerances on quantity if required;g) any requirements for inspection documents;h) any special requirements agreed between purchaser and supplier: marking of products; references to drawings, etc.; any special test required (earing, etc.) and the corresponding acceptation limits;i) for products intended to be surface treated by the purchaser the order shall also contain the following information: the intended particular surface treatment(according to the relevant EN standard); the number of sides for which a good visual appearance is required and, if only one side, its position with respect to the strip (inside or outside of the coil) or the sheet, plate or circle (upside or downside).5 Mechanical properties5.1 GeneralThe mechanical properties shall conform to the requirements specified in EN 485-2.5.2 EaringWhen applications, such as deep-drawing and spinning, require a limited level of earing, the maximum acceptable level of earing shall be agreed between purchaser and supplier, recognizing that test results may be dependent on testing procedures.6 Tolerances on dimensions and form6.1 GeneralTolerances on dimensions and form shall conform to EN 485-3 and EN 485-4, with the amendments and additions given in 6.2 to 6.5.6.2 DiameterTolerances on diameter for circles shall conformto Table 1. These tolerances include the tolerances on roundness.NOTE For circles obtained by blanking the recommended standard diameters are: from 100 mm up to 500 mm nominal diameter: every multiple of 5; over 500 mm up to 1 000 mm nominal diameter: every multiple of 10.6.3 ThicknessTolerances on thickness for hot-rolled circle and circle stock shall conform to Table 2.Tolerances on thickness for cold-rolled circle and circle stock shall conform to Table 3. The partition into group I and group II of most common materials which may be used for the present application, in conformance with EN 602, shall be as shownin Table 4.6.4 Tolerances on flatness for circleTolerances on flatness for circles, expressed as a percentage of the diameter D and/or the measured chord length L, shall conform to Table 5.Deviation from flatness d, resulting from arching or buckling, shall be measured as shown in Figure 1 and Figure 2, using a lightweight straightedge and a feeler gauge, dial gauge or scale, while the circle is resting on a horizontal base plate, concave side upwards.Two measurements shall be carried out with the straight edge respectively parallel and perpendicular to the rolling direction.6.5 Edge burr tolerances for circleThe edge burr shall not be detachable under slight pressure with the thumb, in order not to induce mechanical defects on the surface during the subsequent forming operations (deep-drawing, spinning, etc.).NOTE It is recommended that the height of the total burr as measured from the flat surface of the circle (see Figure 3) should not exceed: 0,2 mm for thicknesses up to 2 mm; 10 % of the nominal thickness for thicknesses above 2 mm.7 Other requirementsParticular surface roughness requirements may be agreed between supplier and customer. In that case the maximum acceptable roughness shall be specified as well as the method of measurement, according to an appropriate standard or specification, and the location and number of measuring points.Table 1 Tolerances on diameterSpecified thicknessMethod of productionDiameter tolerances for specified diameteraOverUp toUp to 600Over 600 up to1 000Over 1 000 up to1 6000,24,0Blanking 0,3 0,3Circular sawing or shearing+30+40+704,06,0Blanking 0,5 0,5Circular sawing or shearing+40+50+806,012,0Blanking 0,7 0,7Circular sawing or shearing+40+50+80a These tolerances include the tolerances on roundness.Table 2 Thickness tolerances for hot-rolled circle and circle stockDimensions in millimetresDimensions in millimetresSpecified thicknessThickness tolerance for specified diameter or widthOverUp toUp to 1 250Over 1 250Up to 1 6002,54,0 0,28 0,284,05,0 0,30 0,305,06,0 0,32 0,326,08,0 0,35 0,358,010,0 0,40 0,4510,012,0 0,45 0,55Table 3 Thickness tolerances for cold-rolled circle and circle stockDimensions in millimetresSpecified thicknessThickness tolerance for specified diameter or widthaOverUp toUp to 1 000Over 1 000 Up to 1 250Over 1 250 Up to 1 600GroupIGroupIIGroupIGroupIIGroupIGroupII0,20,5 0,02 0,03 0,03 0,03 0,04 0,050,50,6 0,03 0,03 0,04 0,04 0,05 0,060,60,8 0,03 0,04 0,04 0,04 0,05 0,070,81,0 0,04 0,04 0,05 0,05 0,06 0,071,01,2 0,04 0,05 0,06 0,07 0,07 0,081,21,5 0,04 0,05 0,07 0,08 0,09 0,101,51,8 0,05 0,06 0,08 0,09 0,101,82,0 0,05 0,06 0,10 0,102,02,5 0,06 0,07 0,10 0,102,53,0 0,07 0,08 0,12 0,133,03,5 0,10 0,13 0,133,54,0 0,11 0,15 0,174,05,0 0,15 0,20 0,205,06,0 0,20 0,22 0,246,08,0 0,24 0,26 0,28a When measuring the thickness, a zone 10 mm wide from the edges of the product shall be disregarded.Table 4 Material groupsGroup IEN AW-1080A, EN AW-1070A, EN AW-1050A, EN AW-1200EN AW-3003, EN AW-3103, EN AW-3005, EN AW-3105EN AW-4006, EN AW-4007EN AW-5005, EN AW-5050EN AW-8011AGroup IIEN AW-3004, EN AW-3104EN AW-5049, EN AW-5251, EN AW-5052, EN AW-5154A EN AW-5454, EN AW-5754Table 5 Flatness tolerances for circlesDimensions in millimetresSpecified thicknessMaximum total deviationdmax/L%Maximum partial deviation (for a chord of at least 300 mm)dmax/D%OverUp to0,20,5By agreementBy agreement0,53,00,40,53,06,00,40,46,012,00,30,4Figure 1 Arch (see 6.4)Figure 2 Buckle (see 6.4)Figure 3 Edge burr (see 6.5)BS EN 851:1996List of referencesSee national foreword. 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