1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Classification ICS 77.080.10Founding Ausferritic spheroidal graphite cast irons BRITISH STANDARDBS
2、ISO 17804:2005BS ISO 14835-2:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 25 January 2006 BSI 25 January 2006ISBN 0 580 47497 6The British Standards which implement international publications referred to in this document may be found i
3、n the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsib
4、le for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to 30, an inside back cover and a back cover.The BSI
5、copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiries on the interpretation, or propo
6、sals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 17804:2005 and implements it as the UK national standard.The UK participation in its preparation was e
7、ntrusted to Technical Committee ISE/35, Cast iron, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any Reference numberISO 17804:2005(E)INTERNATIONAL STANDARD ISO17804First edition2005-11-01Founding Ausferritic sphero
8、idal graphite cast irons Classification Fonderie Fonte ausferritique graphite sphrodal Classification BS ISO 17804:2005ii iiiContents Page Foreword. v Introduction . vi 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Designation . 2 5 Order information . 2 6 Manufacture. 3 7 Requ
9、irements 3 7.1 General. 3 7.2 Test pieces machined from separately cast and cast-on samples . 3 7.3 Test pieces machined from samples cut from a casting 3 7.4 Hardness 5 7.5 Graphite structure. 5 7.6 Matrix structure. 5 8 Sampling 5 8.1 General. 5 8.2 Separately cast samples 5 8.3 Cast-on samples .
10、6 8.4 Samples cut from a casting . 7 9 Test methods. 8 9.1 Tensile test 8 9.2 Impact test, Charpy V . 8 9.3 Hardness test 8 10 Retests . 8 10.1 Need for retesting . 8 10.2 Test validity . 9 10.3 Non-conforming test results 9 10.4 Heat treatment of samples and castings 9 11 Additional information 9 A
11、nnex A (normative) Abrasion-resistant grades of ausferritic spheroidal graphite cast iron. 16 Annex B (normative) Minimum elongation values for a test piece with original gauge length L0= 4 d. 18 Annex C (informative) Guidance values for Brinell hardness . 19 Annex D (informative) Procedure for the
12、determination of the hardness range . 20 Annex E (informative) Guidance values for tensile strength and elongation for test pieces machined from samples cut from a casting 1 . 21 Annex F (informative) Unnotched impact test. 22 Annex G (informative) Additional information on mechanical and physical p
13、roperties. 24 Annex H (informative) Nodularity (or spheroidal graphite rate) 26 Annex I (informative) Machinability of ausferritic spheroidal graphite cast irons 27 BS ISO 17804:2005iv Annex J (informative) Cross-references of similar grades of ausferritic spheroidal graphite cast iron 29 Bibliograp
14、hy . 30 BS ISO 17804:2005vForeword 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 interested
15、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 Commi
16、ssion (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 technica
17、l 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 shal
18、l not be held responsible for identifying any or all such patent rights. ISO 17804 was prepared by Technical Committee ISO/TC 25, Cast irons and pig irons, Subcommittee SC 2, Spheroidal graphite cast irons. BS ISO 17804:2005vi Introduction Ausferritic spheroidal graphite cast iron is a cast alloy, i
19、ron and carbon based, carbon being present mainly in the form of spheroidal graphite particles. Compared with the spheroidal graphite cast-iron grades (see ISO 1083:2004), this material combines higher strength and toughness properties as a result of the austempering heat treatment. This Internation
20、al Standard deals with the classification of ausferritic spheroidal graphite cast irons in accordance with the mechanical properties of the material. The mechanical properties of these ausferritic spheroidal graphite cast irons depend on their structure, e.g. the form of the graphite and the structu
21、re of the matrix. The required structure is developed by selecting the appropriate composition and subsequent processing. The mechanical properties of the material can be evaluated on machined test pieces prepared from: separately cast samples with an appropriate gating system, able to provide metal
22、lurgical conditions similar to those of the castings they represent; samples cast onto either the casting or the running system, hereafter referred to as cast-on samples; samples cut from a casting (only by agreement between the manufacturer and the purchaser, the agreement specifying, in particular
23、, the conditions of sampling and the values to be obtained). Two grades of ausferritic spheroidal graphite cast iron are specified in Annex A, in accordance with their hardness. These cast irons are used in applications (e.g. mining, earth moving and manufacturing industries) where high abrasion res
24、istance is required. Five grades of ausferritic spheroidal graphite cast iron are specified by the mechanical properties. When, for these grades, hardness is a requirement for the application, Annex D provides means for determining appropriate hardness ranges. BS ISO 17804:20051Founding Ausferritic
25、spheroidal graphite cast irons Classification 1 Scope This International Standard defines the grades and the corresponding requirements for ausferritic spheroidal graphite cast irons. This International Standard specifies five grades of ausferritic spheroidal graphite cast iron by a classification b
26、ased on mechanical properties measured on machined test pieces prepared from: separately cast samples or cast-on samples; samples cut from a casting. This International Standard also specifies two grades by a classification as a function of hardness. 2 Normative references The following referenced d
27、ocuments 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 148-1, Metallic materials Charpy pendulum impact test Part 1: Test meth
28、od ISO 148-2, Metallic materials Charpy pendulum impact test Part 2: Verification of test machines ISO 148-3, Metallic materials Charpy pendulum impact test Part 3: Preparation and characterization of Charpy V reference test pieces for verification of test machines ISO 945, Cast iron Designation of
29、microstructure of graphite ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6892, Metallic materials Tensile testing at ambient temperature ISO/TR 15931, Designation system for cast irons and pig iro
30、ns BS ISO 17804:20052 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ausferritic spheroidal graphite cast iron cast material, iron and carbon based, carbon being present mainly in the form of spheroidal graphite particles, subjected to an au
31、stemper heat treatment in order to produce an ausferritic matrix NOTE Ausferritic spheroidal graphite cast iron is also known as austempered ductile iron (ADI). 3.2 graphite spheroidising treatment process which brings the liquid iron into contact with a substance to produce graphite in spheroidal f
32、orm during solidification 3.3 austemper heat treatment of spheroidal graphite cast iron process, consisting of heating the castings above the AC1temperature (at which austenite starts to form during heating), cooling at a rate sufficient to avoid the formation of pearlite, and transforming the matri
33、x structure for a time and a temperature (above the martensite start temperature) sufficient to produce the desired properties NOTE This process produces a microstructure that consists predominantly of ferrite and austenite. This microstructure is called ausferrite. 3.4 relevant wall thickness secti
34、on of the casting, agreed between the manufacturer and the purchaser, to which the determined mechanical properties apply NOTE Relevant wall thickness may be associated with a range of casting sections and/or with a sample type and size according to Table 3. The association is made by considering th
35、e cooling conditions during solidification and heat treatment. 4 Designation The material shall be designated in accordance with ISO/TR 15931. Annex J gives a selection of approximate cross-references of grade designations in this International Standard to standard grades from EN, ASTM, JIS and SAE
36、standards. 5 Order information The following information shall be supplied by the purchaser: a) the complete designation of the material; b) any special requirements. All agreements shall be made between the manufacturer and the purchaser by the time of acceptance of the order. BS ISO 17804:200536 M
37、anufacture The method of producing ausferritic spheroidal graphite cast iron, its chemical composition and heat treatment, shall be left to the discretion of the manufacturer, who shall ensure that the casting process and heat treatment process are carried out with the same process parameters as the
38、 approved first samples. 7 Requirements 7.1 General The property values for these materials apply to castings cast in sand moulds or moulds of comparable thermal behaviour. Subject to amendments to be agreed upon in the order, they can apply to castings obtained by alternative methods. The material
39、designation is based on the minimum mechanical properties obtained in separately cast or cast-on samples, cast in a sand mould or a mould of comparable thermal behaviour, corresponding to a relevant wall thickness 12,5 mm L0(in principle, Lc L0 d); Ltis the total length of the test piece, which depe
40、nds on Lc. NOTE The method of gripping the ends of the test piece, together with their length lt, may be agreed between the manufacturer and the purchaser. aPreferred dimension. Figure 5 Tensile test piece BS ISO 17804:200515Dimensions in millimetres Figure 6 Charpy V-notched impact test piece BS IS
41、O 17804:200516 Annex A (normative) Abrasion-resistant grades of ausferritic spheroidal graphite cast iron A.1 Scope This annex defines the grades of abrasion-resistant ausferritic spheroidal graphite cast iron. It specifies the grades in terms of hardness. A.2 Requirements The Brinell hardness for t
42、he different grades shall be as specified in Table A.1. Table A.1 also gives other properties for information only. Table A.1 Abrasion-resistant ausferritic spheroidal graphite cast irons Brinell hardness Other properties (for information only) HBW RmRp0,2A Material designation minimum N/mm2N/mm2% I
43、SO17804/JS/HBW400 400 1 400 1 100 1 ISO17804/JS/HBW450 450 1 600 1 300 NOTE 1 The manufacturer and the purchaser may agree on the maximum Brinell hardness. NOTE 2 1 N/mm2= 1 MPa. NOTE 3 If the type of sample is to be specified, a “/“ is added to the designation, followed by a letter indicating the t
44、ype of sample: S for a separately cast sample; U for a cast-on sample; C for a casting. A.3 Sampling Unless otherwise specified by the purchaser by the time of acceptance of the order, the number and frequency of Brinell hardness tests shall be in accordance with the in-process quality assurance pro
45、cedures used by the manufacturer. If it is not possible to carry out the hardness test on the casting, then by agreement between the manufacturer and the purchaser, the hardness test may be carried out on a knob cast onto, and heat treated with, the casting. BS ISO 17804:200517A.4 Hardness test The
46、Brinell hardness test shall be carried out in accordance with ISO 6506-1. NOTE 1 Hardness determined by one test method is not necessarily comparable to hardness determined by other test methods. Hardness conversion from other test methods can be done by agreement between the manufacturer and the pu
47、rchaser. Each Brinell hardness test shall be carried out on a casting at locations agreed between the manufacturer and the purchaser, or on a cast-on test block. Unless otherwise specified by the purchaser, the dimensions and location of the cast-on block shall be left to the discretion of the manuf
48、acturer. NOTE 2 A cast-on test block can be used when the size of the casting or the number of castings to be tested makes direct testing on the castings impracticable. If the test is to be carried out on a cast-on block, the latter shall not be removed from the casting until after the heat treatmen
49、t has been carried out. When castings are too large or too difficult to be tested in a conventional hardness testing machine or when there is the need for on-line inspection of a large number of castings, a portable hardness-testing device may be used. When using portable hardness-testing devices, reference shall be made to appropriately calibrated test blocks. A.5 Retests Retests shall be permitted and carried out under the same conditions as those specified in Clause 10. BS IS
