ASTM B240-2017 铸造与模铸件用锌和锌铝合金锭的规格 Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings

1.1 This specification covers commercial zinc and zinc-aluminum (ZA) alloys in ingot form for remelting for the manufacture of pressure die castings, foundry castings and continuous cast bar stock as designated and specified in Table 1. Seven alloy compositions are specified, designated as follows: Common Traditional ASTMA UNSA         Alloy 3 Zamak 3 AG 40A Z33524 Alloy 7 Zamak 7 AG 40B Z33526 Alloy 5 Zamak 5 AC 41A Z35532 Alloy 2 Zamak 2 AC 43A Z35544 ZA-8 ZA-8  ... Z35637 ZA-12 ZA-12 ... Z35632 ZA-27 ZA-27 ... Z35842 ACuZinc52 ACuZinc5 ... Z46540(A) See Table 1, footnote B. (A) Zinc alloy ingot for die casting may contain nickel, chromium, silicon, and manganese in amounts of up to 0.02, 0.02, 0.035 and 0.05 %, respectively. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations and, therefore, analyses are not required for these elements, except that nickel analysis is required for Z33526.(B) ASTM alloy designations were established in accordance with Practice B275. UNS assignations were established in accordance with Practice E527. The last digit of a UNS number differentiates between alloys of similar composition. UNS designations for ingot and casting versions of an alloy were not assigned in the same sequence for all alloys.(C) For purposes of acceptance and rejection, the observed value or calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures, used in expressing the specified limit, in accordance with the rounding procedure prescribed in Practice E29.(D) When this material is required to conform to ISO Standard 301, the chemical limits for thallium and indium each shall not exceed 0.001 %.(E) Zinc-aluminum ingot for foundry and pressure die casting may contain nickel, chromium, and manganese in a