1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 5755:2012Sintered metal materials SpecificationsBS EN ISO 5755:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 5755:2012.
2、 The UK participation in its preparation was entrusted to Technical Committee ISE/65, Sintered metal components.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. U
3、sers are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 55815 3 ICS 77.160 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority
4、 of the Standards Policy and Strategy Committee on 30 September 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5755 September 2012 ICS 77.160 English Version Sintered metal materials - Specifications (ISO 5755:2012) Matriaux mtalliq
5、ues fritts - Spcifications (ISO 5755:2012) Sintermetalle - Anforderungen (ISO 5755:2012) This European Standard was approved by CEN on 25 August 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status
6、 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, Germ
7、an). 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
8、, 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 Unit
9、ed 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 ISO 5755:201
10、2: EBS EN ISO 5755:2012EN ISO 5755:2012 (E) 3 Foreword This document (EN ISO 5755:2012) has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at t
11、he latest by March 2013, and conflicting national standards shall be withdrawn at the latest by March 2013. 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 al
12、l such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations 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
13、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. Endorsement notice The text of ISO 5755:2012 has been approved by
14、 CEN as a EN ISO 5755:2012 without any modification. BS EN ISO 5755:2012ISO 5755:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Terms and definitions . 2 4 Sampling 3 5 Test methods for normative properties 3 5.1 General . 3 5.2 Chemical analys
15、is . 3 5.3 Open porosity 3 5.4 Mechanical properties . 4 6 Test methods for informative properties 5 6.1 General . 5 6.2 Density 5 6.3 Tensile strength . 5 6.4 Tensile yield strength 5 6.5 Elongation 5 6.6 Youngs modulus 5 6.7 Poissons ratio . 5 6.8 Impact energy 6 6.9 Compressive yield strength . 6
16、 6.10 Transverse rupture strength 6 6.11 Fatigue strength 6 6.12 Apparent hardness 7 6.13 Coefficient of linear expansion 7 7 Specifications 7 8 Designations 7 Annex A (normative) Designation system 33 Annex B (informative) Microstructures . 36 Bibliography 39 BS EN ISO 5755:2012ISO 5755:2012(E) iv
17、ISO 2012 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body intereste
18、d in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Com
19、mission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the techni
20、cal 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 elements of this document may be the subject of patent rights. ISO sh
21、all not be held responsible for identifying any or all such patent rights. ISO 5755 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 5, Specifications for powder metallurgical materials (excluding hardmetals). This third edition cancels and replaces the second editi
22、on (ISO 5755:2001), which has been technically revised. BS EN ISO 5755:2012INTERNATIONAL STANDARD ISO 5755:2012(E) ISO 2012 All rights reserved 1Sintered metal materials Specifications 1 Scope This International Standard specifies the requirements for the chemical composition and the mechanical and
23、physical properties of sintered metal materials used for bearings and structural parts. When selecting powder metallurgical (PM) materials, it should be taken into account that the properties depend not only on the chemical composition and density, but also on the production methods. The properties
24、of sintered materials giving satisfactory service in particular applications may not necessarily be the same as those of wrought or cast materials that might otherwise be used. Therefore, liaison with prospective suppliers is recommended. 2 Normative references The following referenced documents are
25、 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 437, Steel and cast iron Determination of total carbon content Combustion gravimetr
26、ic method ISO 1099, Metallic materials Fatigue testing Axial force-controlled method ISO 1143, Metallic materials Rotating bar bending fatigue testing ISO 2738, Sintered metal materials, excluding hardmetals Permeable sintered metal materials Determination of density, oil content and open porosity I
27、SO 2739, Sintered metal bushings Determination of radial crushing strength ISO 2740, Sintered metal materials, excluding hardmetals Tensile test pieces ISO 2795, Plain bearings Sintered bushes Dimensions and tolerances ISO 3325, Sintered metal materials, excluding hardmetals Determination of transve
28、rse rupture strength ISO 3928, Sintered metal materials, excluding hardmetals Fatigue test pieces ISO 3954, Powders for powder metallurgical purposes Sampling ISO 4498, Sintered metal materials, excluding hardmetals Determination of apparent hardness and micro-hardness ISO 5754, Sintered metal mater
29、ials, excluding hardmetals Unnotched impact test piece ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 7625, Sintered metal materials, excluding hardmetals Preparation of samples for chemical analysis for determination of carbon content BS EN ISO 5755:20
30、12ISO 5755:2012(E) 2 ISO 2012 All rights reservedISO 14317, Sintered metal materials, excluding hardmetals Determination of compressive yield strength ASTM E228, Standard Test Method for Linear Thermal Expansion of Solid Materials with a Push-Rod Dilatometer ASTM E1875, Standard Test Method for Dyna
31、mic Youngs Modulus, Shear Modulus, and Poissons Ratio by Sonic Resonance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tensile strength Rm ability of a test specimen to resist fracture when a pulling force is applied in a direction parallel
32、 to its longitudinal axis expressed in MPa NOTE It is equal to the maximum load divided by the original cross-sectional area. 3.2 tensile yield strength Rp0,2load at which the material exhibits a 0,2 % offset from proportionality on a stress-strain curve in tension, divided by the original cross-sec
33、tional area expressed in MPa 3.3 Youngs modulus E ratio of normal stress to corresponding strain for tensile or compressive stresses below the proportional limit of the material expressed in GPa 3.4 Poissons ratio v absolute value of the ratio of transverse strain to the corresponding axial strain,
34、resulting from uniformally distributed axial stress below the proportional limit of the material 3.5 impact energy measurement of the energy absorbed when fracturing a specimen with a single blow measured in Joules (J) 3.6 compressive yield strength stress at which a material exhibits a specified pe
35、rmanent set expressed in MPa 3.7 transverse rupture strength stress, calculated from the bending strength formula, required to break a specimen of a given dimension expressed in MPa 3.8 fatigue strength maximum alternating stress that can be sustained for a specific number of cycles without failure,
36、 the stress being reversed with each cycle unless otherwise stated expressed in MPa BS EN ISO 5755:2012ISO 5755:2012(E) ISO 2012 All rights reserved 33.9 radial crushing strength radial stress required to fracture a hollow cylindrical part of specified dimensions expressed in MPa 3.10 density mass p
37、er unit volume of the material expressed in g/cm33.11 apparent hardness resistance of a powder metallurgical (PM) material to indentation, tested under specified conditions; for PM materials, it is a function of the density of the material 3.12 open porosity oil content after full impregnation, divi
38、ded by the volume of the test piece, and multiplied by 100 expressed as a volume percentage 3.13 coefficient of linear expansion change in length per unit length per degree change in temperature expressed in 106K14 Sampling Sampling of powders to produce standard test pieces shall be carried out in
39、accordance with ISO 3954. 5 Test methods for normative properties 5.1 General The following test methods shall be used to determine the normative properties given in Tables 1 to 18. 5.2 Chemical analysis The chemical composition table for each material lists the principal elements by minimum and max
40、imum mass percentage before any additional process, such as oil impregnation, resin impregnation or steam treatment, has taken place. “Other elements” may include minor amounts of elements added for specific purposes and is reported as a maximum percentage. Whenever possible, and always in cases of
41、dispute, the methods of chemical analysis shall be those specified in the relevant International Standards. If no International Standard is available, the method may be agreed upon and specified at the time of enquiry and order. Samples for the determination of total carbon content shall be prepared
42、 in accordance with ISO 7625. Determination of the total carbon content shall be in accordance with ISO 437. 5.3 Open porosity The open porosity shall be determined in accordance with ISO 2738. BS EN ISO 5755:2012ISO 5755:2012(E) 4 ISO 2012 All rights reserved5.4 Mechanical properties 5.4.1 General
43、The as-sintered mechanical properties given in Tables 1 to 18 were determined on pressed and sintered test pieces with a mean chemical composition. The heat-treated mechanical properties given in Tables 1 to 18 were determined on test bars which were either pressed and sintered or machined from pres
44、sed and sintered blanks. They are intended as a guide to the initial selection of materials (see also Clause 1). They may also be used as a basis for specifying any special tests that may be indicated on the drawing. The mechanical properties shall neither be calculated from hardness values nor be d
45、etermined on tensile test pieces taken from a component and used for verifying the values given in Tables 1 to 18. If the customer requires that a specified level of mechanical properties be obtained by tests on the component, these shall be agreed with the supplier and shall be stated on the drawin
46、g and/or any technical documentation of the customer referred to on the drawing. 5.4.2 Tensile properties The ultimate tensile strength and the yield strength shall be determined in accordance with ISO 2740 and, ISO 6892-1. For heat-treated materials, tensile strength and yield strength are approxim
47、ately equal and in this case, tensile strength is specified. The normative yield strengths (as-sintered condition) and ultimate tensile strengths (heat-treated condition) are shown as minimum values. These strengths may be used in designing PM part applications. To select a material which is optimum
48、 in both properties and cost-effectiveness, it is essential that the part application be discussed with the PM parts manufacturer. The minimum values were developed from tensile specimens prepared specifically for evaluating PM materials. Tensile specimens machined from commercial parts may differ f
49、rom those obtained from prepared tensile specimens. To evaluate the part strength, it is recommended that static or dynamic proof-testing be agreed between the purchaser and the manufacturer and carried out on the first production lot of parts. The results of testing to failure can be used statistically to determine a minimum breaking force for future production lots. Acceptable strength can also be demonstrated by processing tensile specimens prepared specifically for evaluating PM
