ASTM B740-09 pdf download.StandardSpecification for Copper-Nickel-Tin Spinodal Alloy Strip.
6. Chemical Composition
6.1 The material shall conform to the chemical composition requirements specified in Table 1 for the copper alloy UNS No. designation specified in the ordering information.
6.2 These composition limits do not preclude the presence of other elements. By agreement between manufacturer or supplier and purchaser, limits may be established and analysis required for unnamed elements.
6.3 Copper may be given as remainder and taken as the difference between the sum of all the elements analyzed and 100%. When all the elements in the table including copper are analyzed, their sum shall be 99.7% min. 7. Materials and Manufacture
7.1 Manufacture—Spinodal Heat Treatment.
7.1.1 Solution-heat-treatment or solution-heat-treated and cold-worked material is normally spinodal hardened by the purchaser after forming or machining. 7.1.2 Mill-hardened products have been spinodal heat treated by the manufacturer. Further thermal treatment is not normally required.
8. Temper
8.1 The standard tempers for products described in this specification are given in Tables 2-4 8.1.1 TB00 (Solution Heat Treated) 8.1.2 TD01 to TD 12 (Solution Heat Treated with varying degrees of cold working)
8.1.3 TX00 ( Spinodal Hardened)
8.1.4 TS01 to TS12 (Hard and Spinodal Hardened) 8.1.5 TM00 to TS08 (mill hardened) 8.2 Other tempers are available and shall be subject to agreement between supplier or manufacturer and purchaser.
9. Grain Size for Annealed Tempers
9.1 Product over 0.010 in. (0.25 mm) in thickness shall have an average grain-size not exceeding the limits prescribed in Table 5. The determinations are made on the separate samples and in a plane perpendicular to the surface.
10. Mechanical Property Requirements
10.1 Tensile Strength Requirements :
10.1.1 The solution heat-treated or solution heat-treated and cold-worked material shall conform to the tensile property requirements specified in Table 2, when tested in accordance with Test Methods E8.
10.1.2 The spinodal heat-treated material shall conform to the tensile property requirements specified in Table 3.
10.1.2.1 Special combinations of properties such as in- creased ductility, electrical conductivity, dimensional accuracy, endurance life, improved stress relaxation resistance, resistance to elastic drift, and hysteresis in springs may be obtained by special spinodal-hardening treatments. The mechanical re- quirements of Table 3 do not apply to such special heat treatments.
10.1.3 The mill-hardened material shall conform to the tensile property requirements specified in Table 4. 11. Performance Requirements 11.1 Bend Testing—The bend test is a method for evaluating the ductility of mill-hardened copper-nickel-tin spinodal alloy strip in thicknesses of 0.004 to 0.020 in. (0.102 to 0.508 mm), inclusive. 11.1.1 Material in tempers TM00, TM02, TM04, and TM06 shall conform to the bend test requirements specified in Table 4 when tested in accordance with 15.2.1. 11.1.2 To pass the test, all three specimens tested from a lot must withstand the 90° bend without visible cracks of fracture when observed of the convex surface of the bend at a magnification of ×10.ASTM B740 pdf download.