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STANDARD
SIST EN 3388:2009
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3388
April 2009 ICS 49.030.20 English Version
Aerospace series - Fasteners, externally threaded, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification 1 275 MPa/650 °C - Manufacturing method optional - Technical specification
Série aérospatiale - Eléments de fixation, filetés, en alliage base nickel résistant à chaud NI-PH2601 (Inconel 718) - Classification : 1 275MPa/650 °C - Mode de fabrication non imposé - Spécification technique
Luft- und Raumfahrt - Verbindungselemente mit Außengewinde aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse : 1 275 MPa/650 °C - Herstellverfahren nach Wahl - Technische Lieferbedingungen This European Standard was approved by CEN on 5 October 2008.
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 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3388:2009: ESIST EN 3388:2009
EN 3388:2009 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .54Certification and quality assurance .6
SIST EN 3388:2009
EN 3388:2009 (E) 3 Foreword This document (EN 3388:2009) 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 2009, and conflicting national standards shall be withdrawn at the latest by October 2009. 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. 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, 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 the United Kingdom. SIST EN 3388:2009
EN 3388:2009 (E) 4 1 Scope This standard specifies the technical and quality assurance requirements for externally threaded fasteners in material NI-PH2601 (Inconel 718) of tensile strength class 1 275 MPa at room temperature, maximum test temperature of material 650 °C. The externally threaded fasteners specified herein may be manufactured by machining from bar or by forging at the manufacturer's option, if forged there is no requirement for control of grainflow. Primarily for Aerospace applications it is applicable to such externally threaded fasteners when referenced on the product standard or drawing. 2 Normative references The following referenced documents are indispensable for the application 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. ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3452, Non-destructive testing — Penetrant inspection — General principles. ISO 3534:1977, Statistics — Vocabulary and symbols. ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and procedures for the assessment of surface texture. ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T). ISO 7961, Aerospace — Bolts — Test methods. ISO 9000, Quality management systems — Fundamentals and vocabulary. EN 2952, Aerospace series — Heat resisting alloy NI-PH2601 — Solution treated and cold worked — Bar for forged fasteners — D ≤ 50 mm — 1 270 MPa ≤ Rm ≤ 1 550 MPa. 1) EN 2961, Aerospace series — Heat resisting alloy NI-PH2601 — Solution treated — Bar for machined fasteners — D ≤ 50 mm — Rm ≥ 1 270 MPa. 1) EN 3219, Aerospace series — Heat resisting nickel base alloy (Ni-P100HT) — Cold worked and softened — Bar and wire for continuous forging or extrusion for fasteners — 3 ≤ D ≤ 30 mm. 1) EN 9100, Aerospace series — Quality management systems — Requirements (based on ISO 9001:2000) and Quality systems — Model for quality assurance in design, development, production, installation and servicing (based on ISO 9001:1994).
1) Published as ASD Prestandard at the date of publication of this standard. SIST EN 3388:2009
EN 3388:2009 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 production batch quantity of finished parts fabricated by the same process from a single material cast (single heat of alloy), having the same basic part number and diameter, heat treated together to the same specified condition and produced as one continuous run 3.2 inspection lot quantity of parts from a single production batch of the same part number which completely defines the part 3.3 Surface discontinuities 3.3.1
crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystallyne in character 3.3.2
seam longitudinal surface defect in the form of an unwelded open fold in the material 3.3.3
lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface 3.3.4
inclusion non-metallic particles originating from the material making process. They may exist as discrete particles or strings of particles extending longitudinally 3.4 test temperature ambient temperature, unless otherwise specified 3.5 simple random sampling the taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen [ISO 3534, see definition] 3.6 critical defect defect that according to judgment and experience is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product or that is likely to prevent performance of the function of a major end item [ISO 3534, see definition] 3.7 major defect defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose [ISO 3534, see definition] SIST EN 3388:2009
EN 3388:2009 (E) 6 3.8 minor defect defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product [ISO 3534, see definition] 3.9 sampling plan plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision [ISO 3534, see definition] 3.10 limiting quality (LQ10) in a sampling plan, a quality limit which corresponds to a specified and relatively low probability of acceptance in this case 10 % probability of acceptance; it is the limiting lot quality characteristic that a lot of this quality would occur When expressed as a per cent defective, it may be referred to as a lot tolerance per cent defective. [ISO 3534, see definition] 3.11 acceptable quality limit (AQL) quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average. [ISO 3534, see definition] 3.12 finished part part ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the dimensional standard or drawing 4 Certification and quality assurance 4.1 Qualification 4.1.1 Purpose The purpose of acceptance tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the bolts constituting the batch satisfy the requirements of this standard. 4.1.2 Conditions The acceptance tests are summarized in Table 3. They shall be performed on each batch. Table 1 specifies, the test method and sampling plan to be used for each test. Bolts from the batch to be tested shall be selected by simple random sampling. Each boIt may be submitted to several tests. The bolts to be subjected to destructive tests may be those on which non-destructive tests have been performed. SIST EN 3388:2009
EN 3388:2009 (E) 7 4.2 Quality system certification 4.2.1 Purpose The purpose of quality system certification is to ensure that the manufacturer has demonstrated the acceptability of his quality system and his ability for continuing production of parts to this standard, to the required limit of quality. 4.2.2 Requirements and procedure The requirements and procedures for quality system certification shall be to the requirements of ISO 9000 and EN 9100. 4.3 Responsibility for inspection and tests The manufacturer is responsible for the performance of all inspection and test requirements as specified herein. Each manufacturer will use their own or exceptionally, any other facilities approved in accordance with 4.2 for the implementation of these inspection and test requirements. 4.4 Inspection and test report A test report showing actual numerical values shall be provided at the purchaser's option as part of the terms of the purchase order. Table 1 — Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.1
Material Material NI-PA2601 to specification EN 2952, EN 2961 or EN 3219 supplied by an approved source: shall be used for the manufacture of bolts to this standard. As stated in the material specification.
5.2
Dimensions, tolerances and tolerances of form and position; threads and quality
A Tables 4 and 5
5.2.1
Dimensions The dimensions of the finished parts shall conform to the product standard or drawing. All dimensions shall be controlled by an approved system of gauging.
5.2.2
Tolerances of form and position Tolerances of form and position shall conform to the product standard or drawing. Tolerances of form and position shall be controlled by an approved system of gauging.
5.2.3
Threads Threads shall conform to the product standard or drawing. Threads shall be gauged by an approved system of gauging.
5.3
Manufacturing Parts may be manufactured by machining from material EN 2961 or by forging from material EN 2952 or EN 3219.
continued SIST EN 3388:2009
EN 3388:2009 (E) 8 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.3.1
Machined from bar parts Parts manufactured from material in the softened, cold worked and solution treated condition shall be semi-finish machined and then precipitation heat treated per 5.3.3.2 prior to final machining, and thread rolling.Parts manufactured from material in the softened, cold worked, solution treated and precipitation treated condition shall be finish machined, thread rolled, etc. without further heat treatment.
5.3.2
Forged parts Forged parts may be formed by hot or cold forging. If hot forged, the forging temperature shall not exceed 1 150 °C and shall be air cooled. The heating equipment for forging shall be of a type which ensures a consistent temperature throughout the batch. The forged blanks shall be solution treated and precipitation treated.
5.3.3
Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination except as permitted by 5.5.2. The heat treatment equipment shall be approved.
Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting. The equipment for abrasive blasting shall be approved.
5.3.3.1
Solution heat treatment Forged parts shall be solution treated at a temperature of 930 °C – 1 010 °C, holding at the selected temperature within ± 15 °C for not less than 1 hour, and air cool or faster.
continued SIST EN 3388:2009
EN 3388:2009 (E) 9 Table 1 (continued) Clause Characteristic Requirement Inspection and test meth
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