BS 970-2:1988 pdf download.Wrought steels for mechanical and allied engineering purposes .
2 Definitions For the purposes of this Part of BS 970 the following definitions apply.
2.1 drawn bar bar of circular cross section obtained, usually after annealing and descaling by drawing of hot-rolled rod on a draw bench (cold deformation without removing material) followed by straightening and cutting. This operation gives the product special features with respect to shape, dimensional accuracy and surface finish but has only a small reducing effect on decarburization and defect depth
2.2 turned (or peeled) bar bar of circular cross section having the special features of drawn products, concerning shape, dimensional accuracy and bright surface finish produced by turning on a lathe (or peeling), together with the additional benefit of metal removal on decarburization and defect depth
2.3 ground bar bar of circular cross section having the special features of drawn products, concerning shape, dimensional accuracy and bright surface finish, produced by grinding or grinding and polishing, together with the additional benefit of metal removal on decarburization and defect depth
3 General The steel products shall comply with the general requirements of this standard and with the specific requirements applicable to the grade concerned. Where any of the options given in appendix A are called up at the time of the enquiry and order, the steel products shall, in addition, comply with the requirements of any such options.
4 Information to be supplied by the purchaser
4.1 General The following information shall be supplied at the time of enquiry and order. a) Details of the form of section, size and quantity (see clause 12). b) The grade of steel (see Table 1, Table 2 and Table 7).
4.2 Options A number of ordering options are given in appendix A. If the purchaser does not specify any of these options at the time of enquiry and order, the manufacturer shall supply in accordance with the basic specification. See option A.11.
5 Steelmaking processes and casting methods
5.1 Steelmaking Steelmaking shall be by any process except the air or mixed air and oxygen bottom blown basic converter process. 5.2 Casting methods The steel shall be cast into ingots or continuously cast. See also option A.1.
6 Chemical composition
6.1 Composition ranges The chemical composition of the steel, based on cast analysis, shall comply with the requirements of the appropriate material specification in Table 1 or Table 2. See also option A.2. NOTE 1 Table 2 gives the composition ranges for the steels in Table 7. NOTE 2 The recommended maximum section thickness for each of the steel grades is given in appendix B.BS 970-2 pdf download.