SIST EN 4400-2:2019
(Main)Aerospace series - Aluminium and aluminium- and magnesium- alloys - Technical specification - Part 2: Aluminium and aluminium alloy sheet and strip
Aerospace series - Aluminium and aluminium- and magnesium- alloys - Technical specification - Part 2: Aluminium and aluminium alloy sheet and strip
This European Standard defines the requirements for the ordering, manufacture, testing, inspection and delivery of aluminium and aluminium alloy sheet and strip, clad or unclad. It shall be applied when referred to and in conjunction with the EN material standard unless otherwise specified on the drawing, order or inspection schedule.
Luft- und Raumfahrt - Aluminium und Aluminium- und Magnesiumlegierungen - Technische Lieferbedingungen - Teil 2: Bleche und Bänder aus Aluminium und Aluminiumlegierungen
Diese Europäische Norm legt die Anforderungen für die Bestellung, Herstellung, Prüfung, Inspektion und Lieferung von plattierten und von unplattierten Blechen und Bändern aus Aluminium und Aluminium-legierungen fest. Sie ist anzuwenden, sofern auf sie verwiesen wird, sowie in Verbindung mit der EN Werkstoffnorm, sofern in der Zeichnung, Bestellung oder Prüfanweisung nicht anders festgelegt.
Série aérospatiale - Aluminium et alliages d'aluminium et magnésium - Spécification technique - Partie 2: Tôles et bandes en aluminium et alliages d'aluminium
Aeronavtika - Aluminij in aluminijeve in magnezijeve zlitine - Tehnične specifikacije - 2. del: Aluminij in aluminijeva pločevina in trak
Ta evropski standard določa zahteve za naročanje, proizvodnjo, preskušanje, pregled ter dobavo aluminija in aluminijeve pločevine in traku, prevlečenih ali neprevlečenih. Uporablja se, kadar se nanj sklicuje, in v povezavi s standardom za materiale EN, razen če je na skici, naročilu ali razporedu pregledov navedeno drugače.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.KQLþQHLuft- und Raumfahrt - Aluminium und Aluminium- und Magnesiumlegierungen - Technische Lieferbedingungen - Teil 2: Bleche und Bänder aus Aluminium und AluminiumlegierungenSérie aérospatiale - Aluminium et alliages d'aluminium et magnésium - Spécification technique - Partie 2: Tôles et bandes en aluminium et alliages d'aluminiumAerospace series - Aluminium and aluminium- and magnesium- alloys - Technical specification - Part 2: Aluminium and aluminium alloy sheet and strip77.150.10Aluminijski izdelkiAluminium products49.025.20AluminijAluminiumICS:Ta slovenski standard je istoveten z:EN 4400-2:2019SIST EN 4400-2:2019en,fr,de01-junij-2019SIST EN 4400-2:2019SLOVENSKI
STANDARDSIST EN 2070-2:2001SIST EN 2070-1:2001/A1:2001SIST EN 2070-1:20011DGRPHãþD
SIST EN 4400-2:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4400-2
March
t r s { ICS
v {ä r t wä t r Supersedes EN
t r y ræ sã s { z {á EN
t r y ræ tã s { z {English Version
Aerospace series æ Aluminium and aluminiumæ and magnesiumæ alloys æ Technical specification æ Part
tã Aluminium and aluminium alloy sheet and strip Série aérospatiale æ Aluminium et alliages d 5aluminium et magnésium æ Spécification technique æ Partie
tã Tôleset bandes en aluminium et alliages d 5aluminium
Luftæ und Raumfahrt æ Aluminium und Aluminiumæ und Magnesiumlegierungen æ Technische Lieferbedingungen æ Teil
tã Bleche und Bänder aus Aluminium und Aluminiumlegierungen This European Standard was approved by CEN on
t z August
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
9
t r s { CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v v r ræ tã t r s { ESIST EN 4400-2:2019
EN 4400-2:2019 (E) 2 Contents
Page European foreword . 3 Introduction . 4 1 Scope . 4 2 Normative references . 4 3 Terms and definitions . 6 4 Wording of order . 7 5 Health and safety . 7 6 Technical requirements . 7
SIST EN 4400-2:2019
EN 4400-2:2019 (E) 3 European foreword This document (EN 4400-2:2019) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. 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 September 2019, and conflicting national standards shall be withdrawn at the latest by September 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 2070-1:1989, EN 2070-1/A1:1993, EN 2070-2:1989. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 4400-2:2019
EN 4400-2:2019 (E) 4 Introduction This European Standard is part of the series of EN metallic material standards for aerospace applications. The general organization of this series is described in EN 4258. 1 Scope This European Standard defines the requirements for the ordering, manufacture, testing, inspection and delivery of aluminium and aluminium alloy sheet and strip, clad or unclad. It shall be applied when referred to and in conjunction with the EN material standard unless otherwise specified on the drawing, order or inspection schedule. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 515, Aluminium and aluminium alloys — Wrought products — Temper designations EN 2002-001, Aerospace series — Metallic materials — Test methods — Part 001: Tensile testing at ambient temperature EN 2002-002, Aerospace series — Metallic materials — Test methods — Part 002: Tensile testing at elevated temperature EN 2002-6, Aerospace series — Metallic materials — Test methods — Part 6: Bend testing 1) EN 2002-8, Aerospace series — Metallic materials — Test methods — Part 8: Micrographic determination of grain size 1) EN 2004-1, Aerospace series — Test methods for aluminium and aluminium alloy products — Part 1: Determination of electrical conductivity of wrought aluminium alloys EN 2004-10, Aerospace series — Test methods for aluminium and aluminium alloy products — Part 10: Preparation of micrographic specimens for aluminium alloys 1) EN 2007, Aerospace series — Test methods for aluminium and aluminium alloy products — Metallographic determination of cladding thickness and copper diffusion in the cladding for rolled products 1) EN 2021, Aerospace series — Metallic materials — Test methods — Shear testing for thin flat product 1) EN 2032-001, Aerospace series — Metallic materials — Part 001: Conventional designation EN 2032-2, Aerospace series — Metallic materials — Part 2: Coding of metallurgical condition in delivery condition
1) Published as ASD-STAN Prestandard at the date of publication of this standard by AeroSpace and Defence industries Association of Europe - Standardization (ASD-STAN) , http://www.asd-stan.org SIST EN 4400-2:2019
EN 4400-2:2019 (E) 5 EN 2078, Aerospace series — Metallic materials — Manufacturing schedule, inspection schedule, inspection and test report — Definition, general principles, preparation and approval EN 2716, Aerospace series — Test method — Determination of susceptibility to intergranular corrosion — Wrought aluminium alloy products — AL-P2XXX- series, AL-P7XXX- series and aluminium-lithium alloys 1) EN 2720, Aerospace series — Test method for metallic materials — Testing of susceptibility to exfoliation corrosion in 2XXX and 7XXX series wrought aluminium alloy products for aerospace constructions 1) EN 3874, Aerospace series — Test methods for metallic materials — Constant amplitude force-controlled low cycle fatigue testing 1) EN 3987, Aerospace series — Test methods for metallic materials — Constant amplitude force-controlled high cycle fatigue testing EN 3988, Aerospace series — Test methods for metallic materials — Constant amplitude strain-controlled low cycle fatigue testing 1) EN 4258, Aerospace series — Metallic materials — General organization of standardization — Links between types of EN standards and their use EN 4259, Aerospace series — Metallic materials — Definition of general terms 1) EN 4268, Aerospace series – Metallic materials – Heat treatment facilities — General requirements EN 4522, Aerospace series — Metallic materials — Test methods — Pin-type bearing test of yield strength 1) EN 4523, Aerospace series — Metallic materials — Test methods — Compression testing 1) EN 4524, Aerospace series — Metallic materials — Test methods — Measurement of fatigue crack growth rates 1) EN 4526, Aerospace series — Metallic materials — Test methods — Sharp edge-notch tensile testing for sheet and strip EN 6018, Aerospace series — Test methods for metallic materials — Determination of density according to displacement method EN 6019, Aerospace series — Test methods for metallic materials — Recommended practice for R-Curve and Kco determination 1) EN 6072, Aerospace series — Metallic materials — Test methods — Constant amplitude fatigue testing EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defence Organizations EN 9133, Aerospace series — Quality Management Systems — Qualification Procedure for Aerospace Standard Products EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method EN 12258-1, Aluminium and aluminium alloys — Terms and definitions — Part 1: General terms SIST EN 4400-2:2019
EN 4400-2:2019 (E) 6 TR 2410, Aerospace series — Metallic materials — Relationship between dimensional standards and material standards 2) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 4259 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp For definitions of temper designation, see EN 515. For definitions specific to aluminium alloys, see EN 12258-1 and with the following additions for aluminium alloy sheet and strip: 3.1 batch as defined in EN 4259 with the following additions: • for solution heat treatment using a continuous furnace, a continuous run of t ≤ 8 h may be considered as the same heat treatment charge. • the batch size shall be as stated in the following table, unless otherwise agreed between manufacturer and purchaser: Strip Sheet Maximum 20 coils which shall not exceed a total mass of 3 000 kg a
Maximum 100 sheets a Except in the case of very large seamless coils ≥ 3 000 kg; where the batch shall be a single coil. 3.2 controlled stretching stretching performed after solution heat treatment and quenching for the purpose of reducing internal stresses and/or deviation from flatness Note 1 to entry: The stretching is defined by a minimum and maximum permanent elongation stated in the material standard. Note 2 to entry: In certain cases controlled stretching is also critical to the achievement of mechanical properties.
2) Published as ASD-STAN Technical Report at the date of publication of this standard by AeroSpace and Defence industries Association of Europe - Standardization (ASD-STAN) (www.asd-stan.org) SIST EN 4400-2:2019
EN 4400-2:2019 (E) 7 4 Wording of order The order shall clearly indicate: a) quantities to be supplied; b) dates of delivery; c) material standard number; d) delivery condition; e) dimensions and tolerances or reference to an appropriate dimensional standard; f) forwarding address; g) nature and type of packing, if required; h) surface protection, if appropriate; i) definition and frequency of any special tests and their retest procedures, if required. 5 Health and safety The product in the delivery condition shall fulfil the health and safety laws of the area of the country when and where it is to be delivered. A product safety data sheet shall be available. 6 Technical requirements 6.1 General The product shall be manufactured in accordance with the requirements of the relevant material standard and the applicable requirements of this specification. A manufacturing schedule shall be established and applied in accordance with EN 2078. The product shall satisfy the requirements of the material standard and/or order. Instructions for the use of the material standard are contained in EN 4258. Unless otherwise specified, the requirements in Tables 1 and 2 shall apply in conjunction with those of the relevant material standard. Table 1 relates to lines 1 to 29 (inclusive) of the material standard and Table 2 relates to lines 30 onwards in which the sub-line format is also used. Lines 2 to 98 may also be opened in line 100 if the material standard details specific qualification requirements. If a specific line number is not shown in Tables 1 and 2, the requirement is stated in the material standard and/or order. 6.2 Qualification requirements Qualification requirements when invoked by the material standard and/or order are detailed in Tables 1 and 2. Unless otherwise agreed between the manufacturer and purchaser the qualification phase shall be as shown below: SIST EN 4400-2:2019
EN 4400-2:2019 (E) 8 Qualification phase Starting Intermediate 1st , 2nd and 3rd batches 4th and 5th batches 6.3 Release requirements 6.3.1 Replacement/Release tests Release testing shall be the responsibility of the manufacturer. The purchaser reserves the right to perform any of the inspections and/or tests required by the material standard and/or order. The test samples shall be representative of the product. When required the manufacturer shall inform the purchaser of the planned dates for extraction of samples and release testing in order that these operations may be witnessed. Tables 1 and 2 detail the requirements for each line of the material standard. Unless otherwise specifically requested by the purchaser, a particular inspection and/or test for release shall be carried out if corresponding acceptance criteria and/or values are stated in the applicable material standard, but see also section 6.3.5 "Capability clause". 6.3.2 Replacement/Retests If any requirement is not met, replacement or retests shall be carried out under the following conditions unless otherwise stated in the material standard or order. Replacement: If the test procedure or test piece preparation is faulty, testing shall be re-applied at the original frequency after rectification of the original cause of failure, on a test piece located near the original one. Retests: When failure cannot be attributed to faulty testing, or test piece preparation, further test samples shall be selected at twice the original frequency from the product, 1 (one) of which shall be that on which the original results were obtained unless already withdrawn by the manufacturer after suitable identification of the cause of failure. If all retest results are satisfactory, the batch shall be accepted. If 1 (one) or more tests are unsatisfactory, the batch shall be: • rejected, or • 100 % retested and the conforming product accepted, or • partially or fully re-heat treated if heat treatment can rectify the cause of the failure and tested as a completely new batch except for chemical composition. The re-heat treatment shall be stated on the inspection and test report. No product or test sample shall be re-heat treated more than twice. SIST EN 4400-2:2019
EN 4400-2:2019 (E) 9 6.3.3 Rejection Any failure to meet the requirements of the material standard shall be cause for rejection. 6.3.4 Special tests Special tests may be required by the purchaser. In such cases, the nature of the test, method, frequency and technical requirements shall be specified on the order or inspection schedule and shall be mutually agreed by the manufacturer and the purchaser. 6.3.5 Capability clause Where sufficient statistical evidence exists that the required acceptance criteria can be routinely achieved and with the agreement of the purchaser, the “capability clause“ may be invoked when and where stated in the material standard and / or this technical specification. In such cases, the test need not be carried out for release purposes unless specifically requested by the purchaser. However, this in no way reduces the obligations of the manufacturer to fulfil the requirements. If subsequent testing indicates that the product does not comply with the requirements, the batch shall be rejected. If the “capability clause“ is invoked but sufficient statistical evidence does not exist, the test shall be carried out for release purposes at a frequency agreed between the manufacturer and purchaser. 6.3.6 Statistical process control Reduction in the extent of release testing, other than that defined in 6.3.5 above may be negotiated with the purchaser on the basis of appropriate statistical process control and/or statistical data. 6.3.7 Inspection and test report The manufacturer shall furnish, with each delivery, a report conforming to the requirements of EN 2078 stating the following: a) manufacturer's name and address; b) order number; c) the following statement: "This product has been tested according to EN 4400-2"; d) material standard number; e) delivery condition and metallurgical code of the product; f) quantity and dimensions; g) manufacturing and inspection schedule reference, if appropriate; h) cast and batch number; i) batch and/or test sample heat treatment, if required by the purchaser; j) results of all tests and chemical analysis and re-tests.
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Table 1 — Technical requirements for lines 1 to 29, where appropriate (1 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 1 Material designation See EN 2032-001. −
2 Chemical composition The test samples used for chemical analysis shall be representative of the product and may be taken from the molten metal. Any subsequent analytical checks taken from the solid product shall take into consideration the heterogeneity normal to the alloy. The method of chemical analysis shall be at the discretion of the manufacturer unless otherwise stated in the material standard or order. In cases of dispute, the method of chemical analysis shall be agreed between the manufacturer and purchaser. The measured chemical composition shall meet the requirements of the material standard and shall be stated in the inspection and test report. 1 (one) per cast 1 (one) per cast 1 (one) per cast 3 Method of melting At the discretion of the manufacturer or unless otherwise stated in the material standard. −
4.1 Form Sheet or strip
4.2 Method of production Rolling The product shall satisfy the requirements of the relevant material standard and this technical specification. The manufacturer shall define the raw materials, processes and inspection requirements in a manufacturing schedule in accordance with EN 2078 and EN 9133. The manufacturer shall make this available to the purchaser upon request. Changes to any manufacturing schedule agreed during qualification and which may adversely affect the quality of the product shall be advised by the manufacturer and shall be subject to written approval from the purchaser. Each product shall be traceable to the cast, production batch and/or heat treatment batch at all stages of manufacture, testing and delivery. −
4.3 Limit dimension(s) Minimum and/or maximum size of the product expressed as nominal thickness, a. See also line 96. −
5 Technical specification Reference to this technical specification EN 4400-2. In cases of conflict, the requirements of the material standard shall take precedence over those of this technical specification. See also EN 4258.
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Table 1 — Technical requirements for lines 1 to 29, where appropriate (2 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 6.1 Delivery condition (1 of 2) The product shall be supplied in the delivery condition specified in this line in the material standard and/or as stated on the order. When required, semi-finished product designations shall conform to the requirements of the order. −
Marking: Sheet: The method of marking used shall not cause corrosion, crack initiation, contamination or unacceptable deformation. The marking shall remain permanently visible after handling and contact with protective products Unless otherwise specified, the nature and colour of marking ink and type of marking characters shall be left to the discretion of the manufacturer. The marking inks shall be removable with cleaning products which do not leave a residue which could affect further processing. The cleaning products shall not give rise to corrosion. All products shall be marked legibly as indicated in the following table. Additional marking shall be agreed between the manufacturer and purchaser and stated on the order.
Continuous marking a (Ink or similar product) End marking b (Ink or similar product)
Material standard Dimensional standard Delivery condition and code Manufacturer and plant identification Nominal product thickness. The following shall be marked in 1 (one) corner of each product: • batch number; • product number; • inspection stamp.
a All indications shall be visible on any separate piece of product of 300 mm x 300 mm. b If required by the purchaser and specified on the order.
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Table 1 — Technical requirements for lines 1 to 29, where appropriate (3 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 6.1 Delivery condition (2 of 2) Strip: Each coil of product shall have attached a durable label indelibly marked with the information shown in the above table. Preservation: Unless otherwise agreed and stated on the order, the product shall be delivered with corrosion protection. The type of corrosion protection shall be agreed between the purchaser and manufacturer. Packing: All necessary precautions shall be taken to prevent damage to, or corrosion of the product. The packing shall be suitable for the type of transportation used. The exterior of the packing shall bear the following information: • name and address of recipient,
• mass, • order number and sufficient information to enable the contents to be related to the relevant documentation. Shipment: The responsibility for shipping shall be detailed in a transport contract. – – –
Heat treatment (1 of 2) Thermal and/or thermomechanical operations shall be applied to the product as specified in the material standard and are listed in the same order as they are applied. Abbreviations and symbols used in the material standard are shown in the following table: all other terms are written in full. −
Term Abbreviation/Symbol Term Abbreviation/Symbol
temperature θ minute min
time t second s
day d water quench WQ
hour h air cool AC
Unless otherwise specified, heat treatment facilities shall conform to EN 4268. If a specific temperature (value and tolerance) and time are stated in the material standard or order, these parameters shall be mandatory. If a temperature range is stated, a temperature within that range, reduced by the tolerances of the furnace, shall be selected. The charge shall be maintained at the temperature selected, subject to the furnace tolerances in the following table, for the period stated in the material standard:
SIST EN 4400-2:2019
EN 4400-2:2019 (E) 13
Table 1 — Technical requirements for lines 1 to 29, where appropriate (4 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 6.1 Heat treatment (2 of 2)
– – –
Heat treatment Temperature range specified in material standard Maximum tolerance (°C)
Solution heat treatment ≥ 10 °C r 5
Artificial ageing t 10 °C r 5
10 °C r 3
When the duration of the treatment stage is stated as a range, a time within that range shall be selected. When the duration is not specified, it shall be at the discretion of the manufacturer. Where "ramping" to the treatment temperature is allowed in the material standard and is used, this shall be stated in the inspection and test report. Where controlled stretching, performed after solution heat treatment is required, this is defined as a stage within the heat treatment. A permanent elongation within the range stated in the material standard shall be selected. Further straightening and/or flattening operations following controlled stretching are not permitted unless agreed between the manufacturer and purchaser.
6.2 Delivery condition code See EN 2032-2. −
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Table 1 — Technical requirements for lines 1 to 29, where appropriate (5 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 7 Use condition The use condition or temper of the product is stated in the material standard. −
Heat treatment x If the delivery condition is the use condition, no further heat treatment shall be applied to the product. • If the delivery condition is not the use condition, the product shall be subject to heat treatment(s) in the same order as those specified in the material standard. Abbreviations and symbols used in the material standard are shown in the following table: all other terms are written in full. −
Term Abbreviation/Symbol Term Abbreviation/Symbol
temperature θ minute min
time t second s
day d water quench WQ
hour h air cool AC
Unless otherwise specified, heat treatment facilities and procedures shall conform to EN 4268. If a specific temperature (value and tolerance) and time are stated in the material standard or order, these parameters shall be mandatory. If a temperature range is stated, a temperature within that range, reduced by the tolerances of the furnace, shall be selected. The charge shall be maintained at the temperature selected, subject to the furnace tolerances in the following table, for the period stated in the material standard:
Heat treatment Temperature range specified in material standard Maximum tolerance (°C)
Solution heat treatment ≥ 10 °C r 5
Artificial ageing t 10 °C r 5
10 °C r 3
When the duration of the treatment stage is stated as a range, a time within that range shall be selected. When the duration is not specified, it shall be at the discretion of the manufacturer / body carrying out the heat treatment. Where "ramping" to the heat treatment temperature is allowed in the material standard and is used, this shall be stated on the inspection and test report. Where the use condition is not the delivery condition the inspection and test report shall detail the heat treatment applied to the test samples representing the use condition: see line 8.3.
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Table 1 — Technical requirements for lines 1 to 29, where appropriate (6 of 8) Material standard line reference Requirements Frequency of testing Qualification phase Release No. Title Starting Intermediate 8.1 Test sample(s) This line relates to test samples for the tests defined in lines 12 to 16. Test samples shall be selected such that they are clear of any stretcher jaw marks. Test samples shall not be worked after removal from the product they represent, excepting any necessary straightening / flattening of samples from coil. Test samples and associated test pieces and test specimens shall be identified in such a manner that their orientation with respect to the product and traceability to the batch is maintained. Where the product is supplied in the use condition and hardness and/or electrical conductivity testing is used for batch uniformity assessment, see line 82, then such testing shall be carried out prior to selection of the tensile test sample(s). In such cases the product(s) showing the lowest hardness and/ or highest electrical conductivity values shall be selected for tensile testing. Where electrical conductivity measurements (line 32) are used as an indirect assessment of resistance to exfoliation corrosion, such measurements shall be made on the test sample(s) selected for tensile testing. −
8.2 Test piece(s) This line relates to test pieces for the tests defined in lines 12 to 16. Test pieces shall be machined from the test samples taken in accordance with the requirements of line 8.1 of this technical specification. Test pieces shall be in the heat treatment condition of the test samples from which they are taken, that is, no further heat treatment shall be carried out. Test piece type and dimensions shall be as specified for the appropr
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