BS 2970:1989 pdf download.Magnesium and magnesium alloy ingots and castings.
1 Scope This British Standard specifies requirements for chemical composition, mechanical properties and other characteristics for the following two types of product for general engineering purposes: a) magnesium and magnesium alloy ingots intended to be remelted for the production of castings; and b) magnesium and magnesium alloy castings. This standard applies to castings made by any metal casting process. For mechanical properties, however, requirements are specified only for castings made by the sand casting and chill casting processes. Details of information to be supplied by the purchaser in any enquiry or order are given in Appendix A. Appendix B describes chemical analysis procedures for ingots and castings and Appendix C describes tensile testing of castings. Appendix D gives guidance on additional inspection and test procedures for castings, including a classification system for castings that enables these test procedures to be agreed readily at the design stage, for quotation purposes and for order. Typical hardness values are given in Appendix E; Appendix F specifies colour coding for ingots; Appendix G gives guidance on the selection of alloys; and Appendix H gives design considerations for corrosion resistance. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.2.4 ingot batch a series of ingots cast from a single uniform melt
2.5 casting a product at or near finished shape, formed by solidification of a metal or alloy in a mould
2.6 sand casting a casting formed in a sand mould
2.7 chill casting a casting formed in a metal mould
2.8 gravity die casting a chill casting in which the molten metal is introduced by gravity
2.9 low-pressure casting a chill or sand casting in which the molten metal is introduced by a low-pressure feed
2.10 pressure die casting a chill casting in which the molten metal is introduced under a pressure in excess of 2 × 10 5 Pa
2.11 investment casting a casting formed from an expendable pattern which has been invested in a suitable mould material
2.12 cast (non-continuous melting) the product of either one furnace melt, or a number of furnace melts where such are aggregated and mixed prior to sampling or pouring
3 Ingots
3.1 Chemical composition The chemical composition of magnesium ingots shall be as given in Table 1 for the appropriate alloy, when determined in accordance with Appendix B.
3.2 Certificate of analysis A certificate of analysis shall be supplied with each cast of ingots. The certificate shall provide the analysis to the specified elements of sample(s) representative of the cast.BS 2970 pdf download.