1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 10294-2:2012Hollow bars for machining Technical delivery conditionsPart 2: Stainless steels with specifiedmachinability propertiesBS EN 10294-2:2012 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of EN 10294-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/110, Steel Tubes, and Iron and Steel Fittings.A list of organizations represented on this committee can beobtained on request to its secretary.T
3、his publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 63805 3ICS 77.140.75Compliance with a British Standard cannot confer i
4、mmunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationDate Text affectedBS EN 10294-2:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 10294-2 February 2012 IC
5、S 77.140.75 English Version Hollow bars for machining - Technical delivery conditions - Part 2: Stainless steels with specified machinability properties Barres creuses pour usinage - Conditions techniques de livraison - Partie 2: Aciers inoxydables usinabilit spcifie Stahlrohre fr die spanende Bearb
6、eitung (Drehteilrohre) - Technische Lieferbedingungen - Teil 2: Nichtrostende Sthle mit spezifizierten Zerspanungseigenschaften This European Standard was approved by CEN on 16 December 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
7、 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
8、 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 bodi
9、es 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, Turkey and Un
10、ited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10294-2:20
11、12: EBS EN 10294-2:2012EN 10294-2:2012 (E) 2 Contents Page Foreword 41 Scope 52 Normative references 53 Terms and definitions . 64 Symbols 65 Classification and designation . 75.1 Classification 75.2 Designation 76 Information to be supplied by the purchaser . 76.1 Mandatory information 76.2 Options
12、 . 76.3 Example of an order 87 Manufacturing process . 87.1 Material making process . 87.2 Manufacturing and delivery conditions . 87.2.1 Manufacturing 87.2.2 Delivery conditions 88 Requirements . 98.1 General 98.2 Chemical composition 98.2.1 Cast analysis 98.2.2 Product analysis 98.3 Mechanical pro
13、perties . 118.4 Corrosion resistance . 148.5 Machinability 148.5.1 Guaranteed cutting speeds (semi-roughing and finishing) 158.6 Appearance and soundness . 158.6.1 Appearance 158.6.2 Soundness 168.7 Straightness . 168.8 Preparation of ends . 168.9 Dimensions, masses and tolerances . 168.9.1 Outside
14、diameter and inside diameter 168.9.2 Mass 168.9.3 Lengths . 168.9.4 Tolerances 208.9.5 Dimensions achievable after machining . 219 Inspection . 219.1 Type of inspection . 219.2 Inspection documents . 219.2.1 Types of inspection documents . 219.2.2 Content of inspection documents 219.3 Summary of ins
15、pection and testing . 2210 Sampling . 2210.1 Test unit 2210.1.1 Number of samples per test unit 2210.2 Preparation of samples and test pieces 2310.2.1 General 2310.2.2 Test piece for the tensile test . 2310.2.3 Test piece for the intergranular corrosion test . 23BS EN 10294-2:2012EN 10294-2:2012 (E)
16、 3 11 Test methods . 2311.1 Chemical analysis . 2311.2 Tensile test . 2311.3 Dimensional inspection 2311.4 Visual examination 2311.5 Intergranular corrosion test . 2311.6 Non-destructive test 2411.7 Machining data 2411.8 Retests, sorting and reprocessing 2412 Marking . 2413 Temporary corrosion prote
17、ction 24Annex A (normative) Method for establishing machining data . 25BS EN 10294-2:2012EN 10294-2:2012 (E) 4 Foreword This document (EN 10294-2:2012) has been prepared by Technical Committee ECISS/TC 110 “Steel tubes, and iron and steel fittings”, the secretariat of which is held by UNI. This Euro
18、pean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the eleme
19、nts 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 differs from ISO 2938, Hollow bars for machining. EN 10294 consists of the following parts, under the general title Hollow bars for
20、machining Technical delivery conditions: Part 1: Non alloy and alloy steels; Part 2: Stainless steels with specified machinability properties. Another European Standard series covering tubes for mechanical and general engineering purposes are: EN 10297, Seamless circular steel tubes for mechanical a
21、nd general engineering purposes - Technical delivery conditions EN 10296, Welded circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries ar
22、e bound to implement this European Standard: 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, Sp
23、ain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 10294-2:2012EN 10294-2:2012 (E) 5 1 Scope This part of EN 10294 specifies the technical delivery conditions for seamless hollow bars made of austenitic (including creep resisting steels) and austenitic-ferritic (duplex) stainless steels,
24、 with specified machinability properties, intended for the manufacture of engineering components by machining. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated
25、references, the latest edition of the referenced document (including any amendments) applies. EN 10020, Definition and classification of grades of steel EN 10021, General technical delivery conditions for steel products EN 10027-1, Designation systems for steels Part 1: Steel names EN 10027-2, Desig
26、nation systems for steels Part 2: Numerical system EN 10052, Vocabulary of heat treatment terms for ferrous products EN 10088-1, Stainless steels Part 1: List of stainless steels EN 10168, Steel products Inspection documents List of information and description EN 10204, Metallic products Types of in
27、spection documents CEN/TR 10261, Iron and steel Review of available methods of chemical analysis EN 10266, Steel tubes, fittings and structural hollow sections Symbols and definitions of terms for use in product standards EN ISO 377, Steel and steel products Location and preparation of samples and t
28、est pieces for mechanical testing (ISO 377) EN ISO 2566-2, Steel Conversion of elongation values Part 2: Austenitic steels (ISO 2566-2) EN ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless st
29、eels Corrosion test in media containing sulphuric acid (ISO 3651-2) EN ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature (ISO 6892-1) EN ISO 10893-10, Non-destructive testing of steel tubes Part 10: Automated full peripheral ultrasonic testing of seamless and
30、welded (except submerged arc-welded) steel tubes for the detection of longitudinal and/or transverse imperfections (ISO 10893-10) ISO 3685, Tool-life testing with single-point turning tools BS EN 10294-2:2012EN 10294-2:2012 (E) 6 3 Terms and definitions For the purpose of this document, the terms an
31、d definitions given in EN 10021, EN 10052 and EN 10266 and the following apply. 3.1 hollow bar circular hollow product for machining made by a seamless tube manufacturing process or by drilling a bore into a rolled or forged bar 3.2 guaranteed cutting speed lowest cutting speed guaranteed by the man
32、ufacturer to obtain a specified minimum tool-life time with a fixed set of machining parameters for a certain steel grade 3.3 centring on the outside diameter first chucking is made on the outside diameter and machining is performed on the outside surface and/or on the inside surface 3.4 centring on
33、 the inside diameter first chucking is made on the inside diameter and machining is performed on the outside surface and/or on the inside surface 4 Symbols In addition to (or deviating from) the symbols defined in EN 10266 the following symbols apply: D Outside diameter; d Inside diameter; D(e)Maxim
34、um achievable outside diameter when centring on the outside diameter; d(e)Minimum achievable inside diameter when centring on the outside diameter; D(i)Maximum achievable outside diameter when centring on the inside diameter; d(i) Minimum achievable inside diameter when centring on the inside diamet
35、er; TN Nominal wall thickness, calculated as the half difference between the nominal outside diameter D and the nominal inside diameter d; vc(Velocity cutting) Cutting speed. BS EN 10294-2:2012EN 10294-2:2012 (E) 7 5 Classification and designation 5.1 Classification According to the classification s
36、ystem in EN 10020 and to their structure, the steel grades in this European Standard are classified as: austenitic stainless steels (corrosion resisting or creep resisting steels); austenitic-ferritic (duplex) stainless steels. For more details see EN 10088-1. 5.2 Designation For hollow bars covered
37、 by this part of this European Standard the steel designation consists of: the number of this part of this European Standard (EN 10294-2); plus either: the steel name in accordance with EN 10027-1; or: the steel number allocated in accordance with EN 10027-2. 6 Information to be supplied by the purc
38、haser 6.1 Mandatory information The following information shall be supplied by the purchaser at the time of enquiry and order: a) quantity (mass or total length or number); b) term “hollow bar“; c) hollow bar size code (outside diameter and inside diameter); d) reference to this European Standard (E
39、N 10294-2); e) steel designation (steel name or steel number) (see 5.2); f) mechanical properties for tubes with wall thicknesses TN 50 mm. 6.2 Options A number of options are specified in this European Standard and these are listed below. In the event that the purchaser does not indicate a wish to
40、implement any of these options at the time of enquiry and order, the hollow bars shall be supplied in accordance with the basic specification (see 6.1). a) product analysis (see 8.2.2); b) corrosion resistance (see 8.4); BS EN 10294-2:2012EN 10294-2:2012 (E) 8 c) specify the machinability with refer
41、ence to the Taylor method (specification of constants and C) (see 8.5); d) special requirements on surface condition, either outside or inside, as specified by the purchaser (see 8.6.1); e) non-destructive testing (see 8.6.2); f) other dimensional requirements (see 8.9.1); g) exact lengths (see 8.9.
42、3). 6.3 Example of an order 50 tonnes of hollow bars, 140 mm outside and 90 mm inside diameter, in accordance with EN 10294-2, made of steel grade 1.4307 (X2CrNi18-9): 50 t hollow bars 140 X 90 EN 10294-2 1.4307 or 50 t hollow bars 140 X 90 EN 10294-2 X2CrNi18-9 7 Manufacturing process 7.1 Material
43、making process The steels covered by this European Standard are characterized by their suitability for machining (see 8.5). The material making process is left at the discretion of the manufacturer provided all requirements defined in Clause 8 can be fulfilled with the material produced. 7.2 Manufac
44、turing and delivery conditions 7.2.1 Manufacturing The hollow bars shall be made by a seamless process or by drilling from round bars. At the discretion of the manufacturer the hollow bars may be hot finished or cold finished. The terms “hot finished“ and “cold finished“ apply to the condition of th
45、e hollow bar before it is heat treated in accordance with 7.2.2. 7.2.2 Delivery conditions The hollow bars shall be supplied in the solution annealed condition over their full length in either: reference heat treatment conditions; solution annealed condition obtained directly by extrusion and subseq
46、uent rapid cooling provided the mechanical properties, corrosion resistance and other properties are in accordance with this European Standard. All specified mechanical properties shall be met even after a subsequent reference heat treatment. BS EN 10294-2:2012EN 10294-2:2012 (E) 9 8 Requirements 8.
47、1 General The hollow bars, when supplied in the delivery condition in 7.2.2 and inspected in accordance with Clause 9, Clause 10 and Clause 11, shall comply with the requirements of this part of this European standard. In addition, the general technical delivery requirements specified in EN 10021 sh
48、all apply. 8.2 Chemical composition 8.2.1 Cast analysis The cast analysis reported by the material manufacturer shall apply and comply with the requirements of Tables 1 and 2. 8.2.2 Product analysis In case of dispute the permissible deviations of a product analysis from the limits of cast analysis specified in Tables 1 and 2 are given in Table 3. Option a: Product analysis shall be supplied. NOTE When welding hollow bars produced according to this European Standard, account shall be taken of the fact that the behaviour of the steel during and after welding is
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