SIST EN 4700-002:2016
(Main)Aerospace series - Steel and heat resisting alloys - Wrought products - Technical specification - Part 002: Bar and section
Aerospace series - Steel and heat resisting alloys - Wrought products - Technical specification - Part 002: Bar and section
This European Standard defines the requirements for the ordering, manufacture, testing, inspection and
delivery of steel and heat resisting alloy bar and section. 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 - Stahl und Hochwarmfeste Legierungen - Umgeformte Erzeugnisse - Technische Lieferbedingungen - Teil 2: Stangen und Profile
Diese Europäische Norm legt die Anforderungen an die Bestellung, Herstellung, Prüfung, Kontrolle und Lieferung von Stangen und Profilen aus Stahl und hochwarmfesten Legierungen fest. Sie ist anzuwenden, wenn sie bei Verweisung auf oder in Verbindung mit der EN-Werkstoffnorm erwähnt wird, sofern in der Zeichnung, Bestellung oder der Prüfanweisung nichts anderes angegeben ist.
Série aérospatiale - Aciers et alliages résistant à chaud - Produits corroyés - Spécification technique - Partie 2: Barres et profilés
Cette Norme Européenne définit les exigences relatives aux commandes, fabrication, essais, contrôles et livraison des barres et profilés en acier et alliages résistant à chaud. La présente norme est applicable lorsqu'elle est citée et conjointement avec la norme de matériaux EN sauf instruction contraire figurant sur le dessin, la commande ou la fiche d'essais.
Aeronavtika - Jeklo in zlitine, odporne proti vročini - Gneteni izdelki - Tehnična specifikacija - 002. del: Palice in profili
Ta evropski standard opredeljuje zahteve za naročanje, proizvodnjo, preskušanje, pregled ter dobavo palic in profilov iz jekla in zlitine, odporne proti vročini. Uporablja se, kadar se nanj sklicuje, in v povezavi s standardom za materiale EN, razen če je na skici, naročilu ali programu pregledov navedeno drugače.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Stahl und Hochwarmfeste Legierungen - Umgeformte Erzeugnisse - Technische Lieferbedingungen - Teil 2: Stangen und ProfileSérie aérospatiale - Aciers et alliages résistant à chaud - Produits corroyés - Spécification technique - Partie 2: Barres et profilésAerospace series - Steel and heat resisting alloys - Wrought products - Technical specification
- Part 002: Bar and section77.140.60Jeklene palice in drogoviSteel bars and rods49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 4700-002:2016SIST EN 4700-002:2016en,fr,de01-junij-2016SIST EN 4700-002:2016SLOVENSKI
STANDARDSIST EN 4700-002:20111DGRPHãþD
SIST EN 4700-002:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4700-002
April
t r s x ICS
v {ä r t wä s r Supersedes EN
v y r ræ r r tã t r s rEnglish Version
Aerospace series æ Steel and heat resisting alloys æ Wrought products æ Technical specification
æ Part
r r tã Bar and section Série aérospatiale æ Aciers et alliages résistant à chaud æProduits corroyés æ Spécification technique æ Partie
r r tã Barres et profilés
Luftæ und Raumfahrt æ Stahl und Hochwarmfeste Legierungen æ Umgeformte Erzeugnisse æ Technische Lieferbedingungen æ Teil
r r tã Stangen und Profile This European Standard was approved by CEN on
t y September
t r s wä
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 Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v y r ræ r r tã t r s x ESIST EN 4700-002:2016
EN 4700-002:2016 (E) 2 Contents Page European Foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 7 4 Wording of order . 8 5 Health and safety . 8 6 Technical requirements. 8
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 3 European Foreword This document (EN 4700-002:2016) 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 October 2016, and conflicting national standards shall be withdrawn at the latest by October 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 4700-002:2010. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 4700-002:2016
EN 4700-002:2016 (E) 4 Introduction This 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.
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 5 1 Scope This European Standard defines the requirements for the ordering, manufacture, testing, inspection and delivery of steel and heat resisting alloy bar and section. 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, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 2002-005, Aerospace series — Test methods for metallic materials — Part 005: Uninterrupted creep and stress-rupture testing
EN 2002-16, Aerospace series — Metallic materials — Test methods — Part 16: Non-destructive testing, penetrant testing1) 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 EN 2078, Aerospace series — Metallic materials — Manufacturing schedule, inspection schedule, inspection and test report — Definition, general principles, preparation and approval EN 2950, Aerospace series — Test method — Wrought heat resisting alloys — Semi-finished products and parts — Conditions for macrographic and micrographic examination — Atlas of structures and defects EN 2951, Aerospace series — Metallic materials — Test method — Micrographic determination of content of non-metallic inclusions1) EN 3874, Aerospace series — Test methods for metallic materials — Constant amplitude force-controlled low cycle fatigue testing1) 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 testing1) EN 4050-1, Aerospace series — Test method for metallic materials — Ultrasonic inspection of bars, plates, forging stock and forgings — Part 1: General requirements
1) Published as ASD-STAN Prestandard at the date of publication of this standard http://www.asd-stan.org/. SIST EN 4700-002:2016
EN 4700-002:2016 (E) 6 EN 4050-4, Aerospace series — Test method for metallic materials — Ultrasonic inspection of bars, plates, forging stock and forgings — Part 4: Acceptance criteria 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 terms1) EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defence Organizations EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts EN 10027-1, Designation systems for steels — Part 1: Steel names EN 10079, Definition of steel products EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1) EN ISO 642, Steel — Hardenability test by end quenching (Jominy test) (ISO 642) EN ISO 643, Steels — Micrographic determination of the apparent grain size (ISO 643) EN ISO 3651-1, Determination of resistance to intergranular corrosion of stainless steels — Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) (ISO 3651-1) EN ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels — Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels — Corrosion test in media containing sulfuric acid (ISO 3651-2) EN ISO 3887, Steels — Determination of depth of decarburization (ISO 3887) EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1) EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1) EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (ISO 6508-1) EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO 6892-1) EN ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature (ISO 6892-2) EN ISO 15549, Non-destructive testing — Eddy current testing — General principles (ISO 15549) ISO 4967, Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams SIST EN 4700-002:2016
EN 4700-002:2016 (E) 7 TR 2410, Metallic materials — Relationship between dimensional standards and material standards2) AMS 2315, Determination of Delta Ferrite Content3) AMS 2750, Pyrometry3)
ASTM A604, Standard Practice for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets4)
ASTM E45, Standard Test Methods for Determining the Inclusion Content of Steel4) ASTM E399, Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials4) ASTM E1444, Standard Practice for Magnetic Particle Testing4) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 4259 apply. For definitions specific to steel, see EN 10079. 3.1 batch: for the general case, see EN 4259; for heat treatment using a continuous furnace, a continuous run of less than or equal to 8 (eight) hours may be considered as the same heat treatment charge.
2) Published as ASD-STAN Technical Report at the date of publication of this standard http://www.asd-stan.org/. 3) Published by: SAE National (US) Society of Automotive Engineers http://www.sae.org/. 4) Published by: ASTM National (US) American Society for Testing and Materials http://www.astm.org/. SIST EN 4700-002:2016
EN 4700-002:2016 (E) 8 4 Wording of order The order shall clearly indicate: quantities to be supplied; dates of delivery; material standard number; delivery condition and metallurgical code of products; dimensions and tolerances or reference to an appropriate dimensional standard; product designation, when required; forwarding address; nature and type of packing, if required; surface protection, if appropriate; 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 current health and safety laws of the area of the country 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. Product shall satisfy the requirements of the material standard and/or order and shall be free from irregularities prejudicial to the subsequent manufacture or use of this product. Notwithstanding previous acceptance complying with this material standard, any product that is found, at a later stage, to contain such imperfection shall be rejected. 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. SIST EN 4700-002:2016
EN 4700-002:2016 (E) 9 6.2 Qualification requirements Qualification requirements when invoked by the material standard and/or order are detailed in Tables 1 and 2. The number of batches and casts shall be agreed between the manufacturer and the customer. 6.3 Release requirements 6.3.1 Release tests Release testing shall be the responsibility of the manufacturer. The customer 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 by the order, the manufacturer shall inform the customer of the planned dates for extraction of samples and release testing in order that these operations may be witnessed. Table 1 and Table 2 detail the requirements for each line of the material standard. Unless otherwise specifically requested by the customer, 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 in 6.3.5. 6.3.2 Retests If any requirement is not met, retests shall be carried out following an agreement between manufacturer and customer. Products shall be: rejected; or 100 % retested and the conforming products accepted; or partially or fully re-heat treated if heat treatment can rectify the cause of the failure and retested. For condition of use material the number if re-heat treatments shall not exceed the number specified in Table 1 (line 7). The reheat treatment shall be stated on the release test certificate. 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 customer. 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 customer.
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 10 6.3.5 Capability clause Where the capability clause is invoked and where sufficient statistical evidence exists, the test need not be carried out (unless specifically requested by the customer). 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 sufficient statistical evidence does not exist, the test shall be carried out at a frequency agreed between the manufacturer and customer. 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 customer 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: manufacturer's name and address and, if appropriate, identification of the plant; order number; material standard number; method of melting; delivery condition and metallurgical code of the product; quantity and dimensions; manufacturing and inspection schedule reference if required by the customer; cast and batch number; all heat treatment, including re-heat treatment and, where appropriate, straightening and stress relieving parameters, applied to the batch; test samples heat treatment; results of the tests and any retests if required by the customer. 6.4 Traceability Each product shall be traceable to the cast, production batch and/or heat treatment batch at all stages of manufacture, testing and delivery.
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 11 Table 1 — Technical requirements for lines 1 to 29, where appropriate (1 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 1 Material designation EN 2032-1 and EN 10027-1 if applicable − − 2 Chemical composition The chemical composition of the alloy shall comply with requirements of the material standard. The samples taken for analysis shall be representative of the melt. The method of analysis shall be at the option of the manufacturer, but in cases of dispute, the reference method set out in the relevant EN or ISO standard shall be used. If no EN or ISO standard exists, a fundamental and agreed method of chemical analysis calibrated against accepted reference standards shall be used. In the case of remelted material, samples shall be taken from positions and at frequencies as described on the right side of this table An analysis shall be made of each sample and certificates of analysis shall be supplied to the customer. The elements to be determined shall be as required by the material specification or as agreed between the manufacturer and the customer. Elements not quoted in the material standard shall not be intentionally added to the alloy without the agreement of the customer, except for the purpose of finishing the heat (e.g. addition of deoxidant); reasonable precautions shall be taken to prevent their inclusion during manufacture. The customer, in agreement with the manufacturer, may set a limit to the amount of one or more such elements and may require the amount of such elements to be stated in the certificate of analysis. The specified ranges of chemical composition are based on cast analyses. Any subsequent analytical checks shall take into consideration the heterogeneity normal to the alloy. Additionally for remelted products, the samples shall be representative for the remelted ingot, taking into account any macro segregation. a) 1 per cast in the case of air melted or vacuum induction melted product b) 2 per VAR or ESR ingot representing top and bottom positions a) 1 per cast in the case of air melted or vacuum induction melted product b) 1 per VAR or ESR ingot
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 12 Table 1 — Technical requirements for lines 1 to 29, where appropriate (2 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 3 Method of melting 1 General The alloy shall be made by the process required by the material standard, unless otherwise agreed between the manufacturer and customer. If the specification permits alternative processes, the manufacturer shall decide which of them shall be used unless the customer states a particular preference on his order. In all instances, the process by which the alloy was made shall be indicated on the release note. When materials standards require “Air melted”, chemical composition, cleanliness, internal imperfection, … requirements may impose to add refining operation process such as AOD, VOD or equivalent process. In this case, the same process used for material qualification should be used for material delivery. 2 Consumable electrode remelted material The manufacturer shall ensure that there is no contamination by foreign materials that may affect the properties and the homogeneity of the final product. The manufacturer shall establish a procedure for melting and remelting meeting the requierements as described above. − − 4.1 Form Bar and section − − SIST EN 4700-002:2016
EN 4700-002:2016 (E) 13 Table 1 — Technical requirements for lines 1 to 29, where appropriate (3 of 11)
Material standard line reference Requirements Frequency of testing Qualification Release No. Title 4.2 Method of production Mechanical hot working: The manufacturer shall establish a procedure for mechanical hot working. This procedure shall define: the homogenisation thermal cycle; the thermo-mechanical working processes; the manufacturing schedule for each process: the temperatures and durations of pre-heating; the temperature range for each working process; the dimensions of the products at each step and conditions for heat treatment between operations. Mechanical cold working: The manufacturer shall establish a procedure for the mechanical cold working. This procedure shall define: the mechanical working processes; the manufacturing schedule for each process; the dimensions of the products at each step and heat treatment conditions between operations. Final operation: Straightening and stress relieving operations shall be indicated in the manufacturing schedule and shall not cause any imperfection prejudicial to the intended use. Surface finishing: Unless otherwise specified, products shall be supplied in the condition specified in the material standard. − − 4.3 Limit dimension(s) Minimum and/or maximum size of the product expressed as nominal thickness, a, or nominal thicknesses for multi-legged/flanged sections, or as a nominal diameter, D, of round bar or as equivalent diameter De. − − 5 Technical specification Reference to this technical specification EN 4700-002. In cases of conflict, the requirements of the material standard shall take precedence over those of this technical specification. − −
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 14 Table 1 — Technical requirements for lines 1 to 29, where appropriate (4 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 6.1 Delivery condition Product shall be supplied in the delivery condition specified in this line in the material standard and/or as stated on the order. – –
Marking: 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 bars shall be marked legibly in a position chosen by the manufacturer as indicated in the following tables unless otherwise agreed between the manufacturer and customer:
Products
Continuous marking a
or end marking b
• Material grade • heat number
Fabrication lot number • Delivery condition • Manufacturer/identification
a Ink or similar product shall be used.
b Hard stamping on one end of the bar.
For small cross sections, there is a third option:
Products of diameter or major sectional dimension, a or D < 35 mm
• The information stated in the above table shall be indelibly marked on a durable label attached to each bundle or products.
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 15 Table 1 — Technical requirements for lines 1 to 29, where appropriate (5 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 6.1 Delivery condition (concluded) Packing: All necessary precautions shall be taken to prevent damage to the product, especially where the delivered surface finish shall be maintained. 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 (Delivery condition) 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 to be 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 water quench WQ
time t oil quench OQ
hour h forced air quench AQ
minute min air cool AC
second s furnace cool FC
Temperature control shall be in accordance with AMS 2750 unless otherwise agreed between the customer and supplier’.
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 16 Table 1 — Technical requirements for lines 1 to 29, where appropriate (6 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 6.1 Heat treatment (Delivery condition) (concluded) If a specific temperature (value and tolerance) is stated in the material standard or order, that temperature 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 total volume of 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:
Selected temperatures °C Tolerances °C
θ < 750 ± 5
750 ≤ θ ≤ 1 250 ± 10
θ > 1 250 ± 15
When the duration of the heat treatment is stated as a fixed value, the tolerance shall be: (020+) %.
When the duration of the heat 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
6.2 Delivery condition code See EN 2032-2. − − 7 Use condition The use condition treatment of the product is stated in the material standard. − −
Heat treatment (Use condition) 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. No product shall be re-hardened or re-solution heat treated more than once without the agreement of the customer. − −
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 17 Table 1 — Technical requirements for lines 1 to 29, where appropriate (7 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title 7 Heat treatment (Use condition) (concluded) 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 to be applied. No product shall be subject to refining, hardening, normalising, softening, solution treatment, primary hardening or precipitation or combination thereof more than twice without the agreement of the customer. 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 water quench WQ
time t oil quench OQ
hour h forced air quench AQ
minute min air cool AC
second s furnace cool FC
Temperature control shall be in accordance with AMS 2750 unless otherwise agreed between the customer and supplier’ If a specific temperature (value and tolerance) is stated in the material standard or order, that temperature 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 total volume of 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:
Selected temperatures °C Tolerances °C
θ < 750 ± 5
750 ≤ θ ≤ 1 250 ± 10
θ > 1 250 ± 15
SIST EN 4700-002:2016
EN 4700-002:2016 (E) 18 Table 1 — Technical requirements for lines 1 to 29, where appropriate (8 of 11) Material standard line reference Requirements Frequency of testing Qualification Release No. Title
When the duration of the heat treatment is stated as a fixed value, the tolerance shall be: (020+) %.
When the duration of the heat 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.
8.1 Test sample(s) This line relates to test samples for the tests defined in lines 12 to 26. The taking and preparation of test samples shall not affect the properties of the product they represent. Test samples and associated test pieces shall be marked in such a manner that their identity, with respect to the product and batch is maintained. − − 8.2 Test piece(s) This line relates to test pieces for the tests defined in lines 12 to
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