SIST EN 10294-2:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stahlrohre für die spanende Bearbeitung (Drehteilrohre) - Technische Lieferbedingungen - Teil 2: Nichtrostende Stähle mit spezifizierten ZerspanungseigenschaftenBarres creuses pour usinage - Conditions techniques de livraison - Partie 2: Aciers inoxydables à usinabilité spécifiéeHollow bars for machining - Technical delivery conditions - Part 2: Stainless steels with specified machinability properties77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific useICS:Ta slovenski standard je istoveten z:EN 10294-2:2012SIST EN 10294-2:2012en,fr,de01-maj-2012SIST EN 10294-2:2012SLOVENSKI
STANDARD



SIST EN 10294-2:2012



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 10294-2
February 2012 ICS 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 à usinabilité spécifiée
Stahlrohre für die spanende Bearbeitung (Drehteilrohre) - Technische Lieferbedingungen - Teil 2: Nichtrostende Stähle 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 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 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 bodies 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 United Kingdom.
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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 10294-2:2012: ESIST EN 10294-2:2012



EN 10294-2:2012 (E) 2 Contents Page Foreword . 41Scope . 52Normative references . 53Terms and definitions . 64Symbols . 65Classification and designation . 75.1Classification . 75.2Designation . 76Information to be supplied by the purchaser . 76.1Mandatory information . 76.2Options . 76.3Example of an order . 87Manufacturing process . 87.1Material making process . 87.2Manufacturing and delivery conditions . 87.2.1Manufacturing . 87.2.2Delivery conditions . 88Requirements . 98.1General . 98.2Chemical composition . 98.2.1Cast analysis . 98.2.2Product analysis . 98.3Mechanical properties . 118.4Corrosion resistance . 148.5Machinability . 148.5.1Guaranteed cutting speeds (semi-roughing and finishing) . 158.6Appearance and soundness . 158.6.1Appearance . 158.6.2Soundness . 168.7Straightness . 168.8Preparation of ends . 168.9Dimensions, masses and tolerances . 168.9.1Outside diameter and inside diameter . 168.9.2Mass . 168.9.3Lengths . 168.9.4Tolerances . 208.9.5Dimensions achievable after machining . 219Inspection . 219.1Type of inspection . 219.2Inspection documents . 219.2.1Types of inspection documents . 219.2.2Content of inspection documents . 219.3Summary of inspection and testing . 2210Sampling . 2210.1Test unit . 2210.1.1Number of samples per test unit . 2210.2Preparation of samples and test pieces . 2310.2.1General . 2310.2.2Test piece for the tensile test . 2310.2.3Test piece for the intergranular corrosion test . 23SIST EN 10294-2:2012



EN 10294-2:2012 (E) 3 11Test methods . 2311.1Chemical analysis . 2311.2Tensile test . 2311.3Dimensional inspection . 2311.4Visual examination . 2311.5Intergranular corrosion test . 2311.6Non-destructive test . 2411.7Machining data . 2411.8Retests, sorting and reprocessing . 2412Marking . 2413Temporary corrosion protection . 24Annex A (normative)
Method for establishing machining data . 25 SIST EN 10294-2:2012



EN 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 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 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 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 differs from ISO 2938, Hollow bars for machining. EN 10294 consists of the following parts, under the general title Hollow bars for 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 and 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 are 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, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 10294-2:2012



EN 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, 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 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, Designation 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 inspection 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 test 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 steels — 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 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 SIST EN 10294-2:2012



EN 10294-2:2012 (E) 6 3 Terms and definitions For the purpose of this document, the terms and 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 manufacturer 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 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) Maximum 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 diameter; 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. SIST EN 10294-2:2012



EN 10294-2:2012 (E) 7 5 Classification and designation 5.1 Classification According to the classification system 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 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 purchaser 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 (EN 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 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); SIST EN 10294-2:2012



EN 10294-2:2012 (E) 8 c) specify the machinability with reference 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 8.9.3). 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 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 Manufacturing 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 the 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 subsequent
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. SIST EN 10294-2:2012



EN 10294-2:2012 (E) 9 8 Requirements 8.1 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 shall 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 dependent not only on the steel, but also on the material thickness and the conditions of preparing for and carrying out welding.
SIST EN 10294-2:2012



EN 10294-2:2012 (E) 10 Table 1 — Chemical composition (cast analysis)a of austenitic stainless steels in % by mass Steel grade C max Si max Mn max P max S
N max Cr
Mo
Ni
Others
Steel name Steel number X2CrNi19-11 1.4306 0,030 1,00 2,00 0,040 0,015-0,030 0,10 17,0-19,0 - 10,0-12,0 - X2CrNi18-9 1.4307 0,030 1,00 2,00 0,040 0,015-0,030 0,10 17,5-19,5 - 8,0-10,5 - X5CrNi18-10 1.4301 0,07 1,00 2,00 0,040 0,015-0,030 0,10 17,5-19,5 - 8,0-10,5 - X8CrNiS18-9 1.4305 0,10 1,00 2,00 0,040 0,15-0,35 0,10 17,0-19,0 - 8,0-10,0 Cu ≤ 1.00 X2CrNiMo17-12-2 1.4404 0,030 1,00 2,00 0,040 0,015-0,030 0,10 16,5-18,5 2,00-2,50 10,0-13,0 - X5CrNiMo17-12-2 1.4401 0,07 1,00 2,00 0,040 0,015-0,030 0,10 16,5-18,5 2,00-2,50 10,0-13,0 - X6CrNiMoTi17-12-2 1.4571 0,08 1,00 2,00 0,040 0,015-0,030 - 16,5-18,5 2,00-2,50 10,5-13,5 Ti 5xC-0.70 X2CrNiMo18-14-3 1.4435 0,030 1,00 2,00 0,040 0,015-0,030 0,10 17,0-19,0 2,50-3,00 12,5-15,0 - a Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the suitability of the steel.
Table 2 — Chemical composition (cast analysis)a of austenitic-ferritic stainless steels in % by mass Steel grade C max Si max Mn max P max S max N
Cr
Mo
Ni
Steel name Steel number X3CrNiMoN27-5-2 1.4460 0,05 1,00 2,00 0,035 0,015 0,05-0,20 25,0-28,0 1,30-2,00 4,5-6,5 X2CrNiMoN22-5-3 1.4462 0,030 1,00 2,00 0,035 0,015 0,10-0,22 21,0-23,0 2,50-3,5 4,5-6,5 a Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the suitability of the steel.
SIST EN 10294-2:2012



EN 10294-2:2012 (E) 11 Table 3 — Permissible deviations of the product analysis from specified limits on cast analysis given in Tables 1 and 2 Element Limiting value for the cast analysis according to tables 1 and 2
% by mass Permissible deviation of the product analysisa % by mass Carbon ≤ 0,030 + 0,005 > 0,030 ≤ 0,10 ± 0,01 Silicon ≤ 1,00 ± 0,05 Manganese ≤ 2,00 + 0,04 Phosphorus ≤ 0,015 ± 0,003 > 0,015 ≤ 0,045 ± 0,005 Sulphur ≤ 0,030 + 0,003 > 0,030 ≤ 0,35 ± 0,005 Nitrogen ≤ 0,22 ± 0,01 Chromium ≥ 16,5 ≤ 20,0 ± 0,20 >20,0 ≤ 28,0 ± 0,25 Molybdenum > 1,30 ≤ 1,75 ± 0,05 > 1,75 ≤ 3,5 ± 0,10 Nickel > 4,5 ≤ 5,0 ± 0,07 > 5,0 ≤ 10,0 ± 0,10 > 10,0 ≤ 20,0 ± 0,15 > 20,0 ≤ 35,0 ± 0,20 a If several product analyses are carried out on one cast, and the contents of an individual element determined lie outside the permissible range of the chemical composition specified for the cast analysis, then it is only allowed to exceed the permissible maximum value or to fall short of the permissible minimum value, but not both for one cast.
8.3 Mechanical properties 8.3.1 The mechanical properties at room temperature shall conform to the requirements of Tables 4 and 5.
SIST EN 10294-2:2012



EN 10294-2:2012 (E) 12 Table 4 — Mechanical properties of austenitic corrosion resisting steels in the solution annealed condition
Steel grade Proof strength Proof strength Tensile strength Elongationa A min (%) Reference heat treatment conditions Resistance to intergranular corrosion Name Number Rp0,2 min MPa Rp1,0 min MPa Rm MPa l t Solution temperaturebCooling inc d Method in
EN ISO 3651-2 X2CrNi19-11 1.4306 180 215 460-680 40 35 1000-1100 w,a yes A X2CrNi18-9 1.4307 180 215 460-680 40 35 1000-1100 w,a yes A X5CrNi18-10 1.4301 195 225 500-700 40 35 1000-1100 w,a yese A X8CrNiS18-9 1.4305 190 225 500-700 35 30 1000-1100 w,a no - X2CrNiMo17-12-2 1.4404 190 225 490-690 40 30 1020-1120 w,a yes A X5CrNiMo17-12-2 1.4401 200 235 500-700 40 30 1020-1120 w,a yese A X6CrNiMoTi17-12-2 1.4571 190 225 490-690 35 30 1020-1120 w,a yes A X2CrNiMo18-14-3 1.4435 190 225 490-690 40 30 1020-1120 w,a yes A a l = longitudinal t = transverse b The maximum temperatures are for guidance only. c w = water
a = air; cooling sufficiently rapidly. d When tested according to EN ISO 3651-2 (Appropriate method A or B or C as indicated). e In delivery condition (Normally not fulfilled in the sensitized condition).
SIST EN 10294-2:2012



EN 10294-2:2012 (E) 13 Table 5 — Mechanical properties of austenitic–ferritic stainless steels in the solution annealed condition Steel grade Proof strength Tensile strength ElongationaA min (%) Reference heat treatment conditions Resistance to intergranular corrosion Name Number Rp0,2 min MPa Rm MPa l t Solution temperatureb Cooling inc d Method in
EN ISO 3651-2 X3CrNiMoN27-5-2 1.4460 460 620-880 20 20 1050-1100 w,a yes A X2CrNiMoN22-5-3 1.4462 450 640-880 22 22 1020-1100 w,a yes B al = longitudinal
t = transverse b The maximum temperatures are for guidance only. c w = water
a = air; cooling sufficiently rapidly. d When tested according to EN ISO 3651-2 (Appropriate method A or B or C as indicated). SIST EN 10294-2:2012



EN 10294-2:2012 (E) 14 For wall thicknesses TN > 50 mm, the mechanical properties shall be agreed between the manufacturer and the purchaser at the time of enquiry and order. 8.4 Corrosion resistance The information given in Tables 4 and 5 refer to the resistance of the steels to intergranular corrosion when tested in accordance with EN ISO 3651-2 to the indicated method A or B or C. Guideline values for the limit temperature for susceptibility to intergranular corrosion are indicated in Tables 4 and 5. Option b: A test for the verification of resistance to intergranular corrosion is specified. If other specific corrosion tests are required, they shall be agreed between the manufacturer and the purchaser at the time of enquiry and order. 8.5 Machinability 8.5.1 General The machinability of a material is characterised by the number of parts produced in a certain time, i.e. productivity, and the surfaces and tolerances that can be achieved during that operation. The machining operations are made in two principal steps, semi-roughing followed by finishing. In order to achieve as high productivity as possible the tool-life should be in the area of 10 min to 20 min depending on combination of cost of production, material, and tools. Due to this the cutting speed should be kept at as a high level as possible and at a guaranteed minimum level. NOTE The productivity is limited by many factors, e.g. power, chip formation, tool-life and surface quality. To achieve a problem-free production a predictable tool-life is desired together with good chip breaking performance. The cutting data chosen should be chosen to minimise the production cost and at the same time consider surface quality and tolerances. The machining operations are made in two principal steps, semi-roughing followed by finishing. Semi-roughing is used to form the part to near-net shape and where high productivity is important. Finishing is used to form the part to finished shape and where surface quality and close dimensional tolerance are limiting the productivity. To achieve a high productivity in machining the way to fulfil the requirement of tool life, is to guarantee a certain lowest level of machinability as per the general requirements of this standard which is "Guaranteed cutting speeds" as expressed in 8.5.2 and in Annex A. Unless Option c is specified, the hollow bars are delivered only to a "Guaranteed cutting speed" as expressed in 8.5.2. Option c: Machinability with reference to the Taylor method. The general requirements in 8.5.2 shall be completed by additional machinability properties based on the Taylor method
The test shall be carried out in accordance with ISO 3685 (applicab
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