1、BRITISH STANDARD BS 1591:1975 Incorporating Amendment No. 1 Specification for Corrosion resisting high silicon iron castings UDC 669.15 78219614:669.14.018.8BS1591:1975 This British Standard, having been approved by the Iron and Steel Industry Standards Committee, was published under the authority o
2、f the Executive Board on 30 May 1975 BSI 07-1999 First published October 1949 First revision May 1975 The following BSI references relate to the work on this standard: Committee reference ISE/35/5 Draft for comment 74/40074 DC ISBN 0 580 08544 9 Co-operating organizations The Iron and Steel Industry
3、 Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The Government department and scientific and industrial organizations marked with an asterisk in the ab
4、ove list, together with the following were directly represented on the committee entrusted with the preparation of this British Standard: British Cast Iron Research Association* Institution of Mechanical Engineers British Constructional Steelwork (Automobile Division)* Association Institution of Pro
5、duction Engineers* British Ironfounders Association Institution of Structural Engineers British Mechanical Engineering Lloyds Register of Shipping* Confederation Ministry of Defence British Steel Industry* National Association of Drop Forgers and Concrete Society Stampers Council of Ironfoundry Asso
6、ciations* National Physical Laboratory Department Council of Iron Producers of Industry Department of Employment Oil Companies Materials Association Department of Trade (Marine Division)* Process Plant Association* Engineering Equipment Users Association* Royal Institute of British Architects Federa
7、tion of Civil Engineering Contractors Shipbuilders and Repairers National Greater London Council Association Institute of British Foundrymen* Society of Motor Manufacturers and Traders Institute of Iron and Steel Wire Ltd.* Manufacturers Steel Castings Research and Trade Association Institute of Mar
8、ine Engineers Tin Research Institute British Malleable Tube Fittings Association National Association of Malleable Ironfounders British Railways Board North East Coast Institution of Engineers and British Valve Manufacturers Association Shipbuilders Meehanite Research Institute of Great Britain Indi
9、vidual firms Amendments issued since publication Amd. No. Date of issue Comments 8636 September 1995 Indicated by a sideline in the marginBS 1591:1975 BSI 07-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Reference 1 3 Information to be supplied by the pur
10、chaser 1 4 Manufacture 1 5 Chemical composition 1 6 Heat treatment 1 7 Freedom from defects 1 8 Provision of samples for chemical analysis 1 9 Method of analysis 1 10 Pressure testing 1 11 Marking and packing 2 12 Inspection 2 13 Testing facilities 2 14 Manufacturers certificate 2 Table 1 Chemical c
11、omposition 2 Publication referred to Inside back coverBS1591:1975 ii BSI 07-1999 Foreword This revised British Standard, prepared under the authority of the Iron and Steel Industry Standards Committee, specifies requirements for high silicon iron castings for use where highly corrosive media are to
12、be handled, such as in the chemical, petrochemical, textile and other such industries. High silicon iron is also used for the manufacture of anodes used in cathodic protection. It is generally accepted that the protective properties of high silicon iron against strong aggressive liquids results from
13、 a thin surface film of hydrated oxides of silicon which forms when strong oxidizing media are being handled. Initially there may be a relatively high rate of the attack which takes place until the film is formed, after which, the rate will reduce to a negligible amount, usually after a period of se
14、veral hours. On occasions when the film is disrupted, corrosion resistance is then dependent on the metallic material of the iron itself and losses will be evident until film healing has occurred. High silicon iron is more brittle than grey cast iron and, in consequence, greater care and precautions
15、 in handling and transporting to avoid accidental breakages are necessary. Since, however, mechanical strength is of secondary importance with this material, no mechanical properties or tests are specified. A method of stress relieving has been added as a precaution to eliminate tendencies to failur
16、es on castings of poor design. Heat treatment is dependent on the size and nature of the casting being such as to allow stress relieving to be carried out as described in clause 6. Grades are designated by the chemical symbols of the main alloying elements and figures indicating their approximate mi
17、nimum levels, e.g. Si14, Si Cr14 4. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summa
18、ry of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front
19、cover.BS1591:1975 BSI 07-1999 1 1 Scope This British Standard specifies requirements for corrosion resisting high silicon iron castings for chemical engineering purposes and for cathodic protection anodes. 2 Reference The title of the British Standard publication referred to in this standard is give
20、n on the inside back cover. 3 Information to be supplied by the purchaser The purchaser shall state the following information on the enquiry and order: a) the grade required, e.g. BS1591 Grade Si 14; b) whether the castings are required to be pressure tested (see clause 10); c) whether the castings
21、are to be inspected during manufacture and tested in the presence of the purchasers representative (see clause 12); d) whether a manufacturers certificate is required and, if so, which of the types specified in clause 14: e) any special requirements, e.g.penetrant testing and packing of castings. 4
22、Manufacture The castings may be made by any process at the option of the manufacturer, who shall ensure that the requirements defined in this standard, or as agreed between the purchaser and the manufacturer, are complied with for the grade of iron required by the order. The castings shall be accura
23、tely moulded in accordance with the pattern or working drawings supplied by the purchaser, and properly fettled and dressed. 5 Chemical composition The chemical composition of castings shall be in accordance with the requirements in Table 1. 6 Heat treatment Heat treatment shall be carried out at th
24、e discretion of the manufacturer. The procedure, if necessary, shall be as follows. The castings shall be stripped from the mould while hot, and, as soon as possible after solidification and with the least possible delay, the hot castings shall be charged direct to a furnace previously heated to a t
25、emperature of approximately600 C and maintained at that temperature during the period of charging the castings. When the furnace is finally charged, the castings shall be uniformly heated to a temperature of not less than750 C and not more than850 C. They shall be soaked at this temperature for a pe
26、riod varying from2h for small castings of simple form and maximum thickness of18mm, to8h for heavy castings of intricate design. After soaking, the castings shall be slowly cooled in the furnace and not removed until the temperature has fallen below300 C. 7 Freedom from defects The castings, as deli
27、vered to the purchaser, shall be free from defects which may impair the performance of the finished component. Rectification of defects shall not be carried out except with the approval of the purchaser. 8 Provision of samples for chemical analysis Material for chemical analysis shall be obtained fr
28、om gates or risers of actual castings or a test sample representing all the castings made from a cast. A cast shall be understood to mean the full content of a batch furnace whether tapped into one or more ladles. 9 Method of analysis The method of analysis shall be as described in BS Handbook No. 1
29、9. 10 Pressure testing If specified by the purchaser on the enquiry and order castings shall be subjected to an air or hydraulic test. The pressure and medium shall be specified by the purchaser on the enquiry and order. Castings showing leakage under this test shall be rejected.BS1591:1975 2 BSI 07
30、-1999 Table 1 Chemical composition 11 Marking and packing The method of marking and packing shall be agreed between the purchaser and the manufacturer. 12 Inspection If castings are to be inspected during manufacture and tested in the presence of the purchasers representative it shall be so stated i
31、n the enquiry and order. In such cases the purchaser or his representative shall have access at all reasonable times to those parts of the manufacturers works engaged on the order. He shall be at liberty to inspect the manufacture at any stage, to witness the required tests and to reject any materia
32、l that does not comply with the requirements of this British Standard. 13 Testing facilities The manufacturer shall supply the material required for testing, furnish and prepare the necessary test pieces and supply labour and appliances for such testing as may be carried out at his works. If facilit
33、ies for making the prescribed tests are not available at his own works, the manufacturer shall arrange for the tests to be carried out elsewhere. 14 Manufacturers certificate When requested by the purchaser, the manufacturer shall supply one of the following types of certificate as agreed with the p
34、urchaser: a) a certificate stating that the castings comply with requirements of this British Standard or b) as for a) above but giving, in addition, the results of the chemical analysis for the elements specified. Chemical composition % Grade C max. Si Mn max. P max. S max. Cr Si 10 1.2 10.0012.00
35、1.0 0.25 0.1 Si 14 1.0 14.2515.25 1.0 0.25 0.1 Si Cr 14 4 1.4 14.2515.25 1.0 0.25 0.1 4.05.0 Si 16 0.8 16.0018.00 1.0 0.25 0.1 NOTEGrade Si 14 is recommended for general applications involving corrosion resistance. Grade Si 10 has greater tensile strength than grade Si 14 but a reduced corrosion res
36、istance. Grade Si 16 is recommended where greater corrosion resistance is required at the expense of tensile strength. Grade Si Cr 14 4 is normally used for the manufacture of cathodic protection anodes.BS1591:1975 BSI 07-1999 Publication referred to This standard makes reference to the following BS
37、I publication: BS Handbook No 19, Methods for the sampling and analysis of iron, steel and other ferrous metals. BS 1591:1975 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK vi
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