1、 STD.BS1 BS EN IS0 8249-ENGL 2000 I 3624669 0863403 Th4 BRITISH STANDARD Welding - Determination of Ferrite Number (FN) in austenitic and duplex ferritic-aus t enitic Cr-Ni stainless steel weld metals The European Standard EN IS0 82492000 has the status of a British Standard ICs 25.160.20 BS EN IS0
2、3249:200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITFED BY COPYBIGHT LAW STD-BSI BS EN IS0 6249-ENGL 2000 3b24bb9 OBb3402 9TO 9 BS EN IS0 8249:20 direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2000
3、 Amd. No. National foreword Date Comments This British Standard is the official English language version of EN IS0 82492000. It is identical with IS0 82492000. It supersedes BS 67871987 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEEDQ, Welding co
4、nsumables, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible intedonavEuropean committee any enquiries on the interpretation, or proposais for change, and keep the UK interests informed; - monitor related internationai and European developments and
5、 promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Stanhds normaly include an annex which lists normative references to internationai publications with the
6、ir corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ fxiiity of the BSI Standards Electr
7、onic Catalogue. A British Standard does not purport to include ail the necessary provisions of a contract. Usem of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This docu
8、ment comprises a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the IS0 title page, pages ii to v, a blank page, pages 1 to 26, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued
9、. O BSI 082000 I I ISBN O 580 34843 1 STD-BSI BS EN IS0 6249-ENGL 2000 I Lb2Libb9 O6b3403 637 = EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 8249 May 2000 ICs 25.160 English version Welding - Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainles
10、s steel weld metals (IS0 8249:2000) Soudage - Dtermination de Ilndice de Ferrite (FN) dans le mtal fondu en acier inoxydable austnitique et duplex ferritique-austnitique au chrome-nickel (IS0 8249:ZOOO) Bestimmung der Ferrit-Nummer (FN) in austenitischem und ferritisch-austenitischem (Duplex-) Schwe
11、igut von Cr-Ni- Sthlen (IS0 8249:2000) This European Standard was approved by CEN on 13 April 2000. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-t
12、o-date lists and bibliographical references concerning such national standards may be obtained on application to the Centrai Secretariat 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
13、 the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Gennany, Greece, Iceland, Ireland, Italy, Luxem
14、bourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels O 2000 CEN All rights of exploitation in any form and
15、by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 82492000 E Foreword The text of the International Standard IS0 8249:2000 has been prepared by Technical Committee ISOTTC 44 “Welding and allied processes“ in collaboration with Technical Committee CENTTC 121 “Welding“, the sec
16、retariat of which is held by DS. 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 November 2000, and conflicting national standards shall be withdrawn at the latest by November 2000. According to t
17、he CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, S
18、weden, Switzerland and the United Kingdom. NOTE FROM CEWCS: The foreword is susceptible to be amended on reception of the German language version. The confirmed or amended foreword, and when appropriate, the normative annex ZA for the references to international publications with their relevant Euro
19、pean publications will be circulated with the German version. Endorsement notice The text of the International Standard IS0 8249:2000 was approved by CEN as a European Standard without any modification. STD-BSI BS EN IS0 824S-ENGL 2000 M Lb24bb9 08b3405 bOT EN IS0 8249:2000 INTERNATIONAL IS0 STANDAR
20、D 8249 Second edition 2000-05-01 Welding - Determination of Ferrite Number (FN) in austenitic and duplex ferritic- austenitic Cr-Ni stainless steel weld metals Soudage - Dtermination de Ilndice de Ferrite (FN) dans le mtal fondu en acier inoxydable austnitique et duplex ferritique-austnitique au chr
21、ome-nickel Reference number IS0 8249:2000(E) STD-BSI BS EN IS0 8249-ENGL 2000 Lb24bb9 OBb340b 54b EN IS0 8249:2000 Contents Page Foreword . iv Introduction . v 1 Scope 1 2 Normative reference 1 3 Principle 1 4 Calibration 2 5 Standard method for covered electrode test pads . 4 6 Standard methods for
22、 test pads of other processes and for production welds . 6 7 Other methods . 7 8 Procedures used to prepare secondary standards for delta ferrite in austenitic stainless steel weld metal . 8 Annex A (informative) Manufacture of secondary standards by strip cladding . 9 Annex B (informative) Manufact
23、ure of secondary standards by centrifugal chill casting 18 Bibliography 26 Previous page is blank iii STD-BSI BS EN IS0 8249-ENGL 2000 e 1624667 08b3407 482 EN IS0 8249:2000 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0
24、member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern
25、mental and non-governmental, in liaison with ISO, also take pari in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISOAEC Dir
26、ectives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the e
27、lements of this International Standard may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all such patent rights. International Standard IS0 8249 was prepared in collaboration with the International Institute of Welding which has been approved by the IS0 Co
28、uncil as an international standardizing body in the field of welding. This second edition cancels and replaces the first edition (IS0 8249:1985), which has been technically revised. Annexes A and B of this International Standard are for information only. iv STD=BSI BS EN IS0 8249-ENGL 2000 O Lb24bb9
29、 08b3408 317 E EN IS0 8249:2000 Introduction At present, there is no universal opinion concerning the best experimental method that gives an absolute measurement of the amount of ferrite in a weld metal, either destructively or non-destructively. This situation has led to the development and use, in
30、ternationally, of the concept of a “Ferrite Number“ or FN. A Ferrite Number is a description of the ferrite content of a weld metal determined using a standardized procedure. Such procedures are laid down in this International Standard. The Ferrite Number of a weld metal has been considered approxim
31、ately equivalent to the percentage ferrite content, particularly at low FN values. More recent information suggests that the FN may overstate the volume percent ferrite at higher FN by a factor in the order of 1,3 to 13, which depends to a certain extent upon the actual composition of the alloy in q
32、uestion. Although other methods are available for determining the Ferrite Number, the standardized measuring procedure, laid down in this International Standard, is based on assessing the tear-off force needed to pull the weld metal sample from a magnet of defined strength and size. The relationship
33、 between tear-off force and FN is obtained using primary standards consisting of a non-magnetic coating of specified thickness on a magnetic base. Each non-magnetic coating thickness is assigned an FN value. The ferrite content determined by this method is arbitrary and is not necessarily the true o
34、r absolute ferrite content. In recognition of this fact, the term “Ferrite Number“ (FN) shall be used instead of “ferrite per cent“ when quoting a ferrite content determined by this method. To help convey the message that this standardized calibration procedure has been used, the terms “Ferrite Numb
35、er“ and “FN“ are capitalized as proper nouns. V STD.BSI BS EN IS0 8249-ENGL 2000 W 1ib24bb9 0863409 255 EN IS0 82492000 Welding - Determination of Ferrite Number (FN) in austenitic and duplex ferritic-austenitic Cr-Ni stainless steel weld metals 1 Scope This International Standard specifies the meth
36、od and apparatus for - the measurement of the delta ferrite content, expressed as Ferrite Number (FN), in largely austenitic and duplex ferritic-austenitic stainless steel) weld metal through the attractive force between a weld metal sample and a standard permanent magnet; - the preparation and meas
37、urement of standard pads for manual metal arc covered electrodes. The general method is also recommended for the ferrite measurement of production welds and for weld metal from other processes, such as gas tungsten arc welding, gas shielded metal arc welding and submerged arc welding (in these cases
38、, the way of producing the pad should be defined); - the calibration of other instruments to measure FN. The method laid down in this International Standard is intended for use on weld metals in the as-welded state and on weld metals after thermal treatments causing complete or partial transformatio
39、n of ferrite to any nonmagnetic phase. Austenitizing thermal treatments which alter the size and shape of the ferrite will change the magnetic response of the ferrite. The method is not intended for measurement of the ferrite content of cast, forged or wrought austenitic or duplex ferritic-austeniti
40、c steel samples. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, this publication do not apply. However, parties to
41、 agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain regi
42、sters of currently valid International Standards. ISOTTR 1551 0:1997, Stainless steels - Chemical composition. 3 Principle The measurement of the ferrite content of largely austenitic stainless steel weld metal through the attractive force between a weld metal sample and a permanent magnet is based
43、upon the fact that the attractive force between a two-phase (or multiphase) sample containing one ferromagnetic phase and one (or more) non-ferromagnetic phase(s) increases as the content of the ferromagnetic phase increases. In largely austenitic and duplex ferritic- austenitic stainless steel weld
44、 metal, ferrite is magnetic, whereas austenite, carbides, sigma phase and inclusions are non-ferromagnetic. 1) The term “austenitic-ferritic (duplex) stainless steel“ is sometimes applied in place of “duplex ferritic-austenitic stainless steel“. 1 STDeBSI BS EN IS0 8249-ENGL 2000 1624567 0863410 T77
45、 EN IS0 8249:2000 4 Calibration 4.1 Coating thickness standards The coating thickness standards shall consist of non-magnetic copper applied to an unalloyed steel base of size 30 mm x 30 mm. The thickness of the unalloyed steel base shall be equal to or greater than the experimentally determined min
46、imum thickness at which a further increase of the thickness does not cause an increase of the attractive force between the standard permanent magnet and the coating thickness standard. The thickness of the non-magnetic copper coating shall be known to an accuracy of I 5% or better. The chemical comp
47、osition of unalloyed steel shall be within the following limits: Element C Limit % 0,08 to 0,13 si 0,lO max. Mn 0,30 to 0,60 P 0,040 max. S 0,050 max. The copper coating may be covered by a chromium flash. The force required to tear off a given permanent magnet from the copper coating side of such a
48、 standard increases as the thickness of the copper coating decreases. NOTE To ensure adequate reproducibility of the calibration, the coating thickness standards defined above should be used. In particular, coating thickness standards produced by the US National Institute of Standards and Technology
49、 (NIST, formerly National Bureau of Standards or NBS) may be used. 4.2 Magnet The standard magnet shall be a permanent magnet of cylindrical shape, 2 mm in diameter and about 50 mm in length. One end of the magnet shall be hemispherical, with a 1 rnm radius and polished. As an example, such a magnet can be made of 36 % cobalt magnet steel, 48,45 mm I 0,05 mm long, magnetically saturated and then diluted to 85 %. The magnetic strength of the magnet shall be such that the force needed to tear off the standard magnet from the different coating thickness
