ASTM B969/B969M-2017 用模压铸造、触变铸造和流变铸造半固体铸件法生产的铝合金铸件的规格 Standard Specification for Aluminum-Alloy Castings Produced by Squeeze Casting,Thixocast and Rheocast Semi-Solid Casting Processes

1.1 This specification covers aluminum-alloy castings, produced by the thixocast, rheocast, semi-solid, and squeeze casting processes shown in Table 1. (A) When single units are shown, they indicate the maximum amounts permitted.(B) Analysis shall be made for the elements for which limits are shown in this table.(C) The following applies to all specified limits in this table: For purposes of determining conformance to these limits, an observed value or a calculated value obtained from analysis shall 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-off method of Practice E29.(D) In case of discrepancy between the values listed in Table 1 and those listed in the “œDesignations and Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (known as the “œPink Sheets”)”€œ, the composition limits registered with the Aluminum Association and published in the “œPink Sheets” shall be considered the controlling composition.(E) “Others” includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samples for trace elements not specified in the specification. However, such analysis is not required and may not cover all metallic “Others” elements. Should any analysis by the producer or the purchaser establish that an “Others” element exceeds the limit of “Each” or that the aggregate of several “Others” elements exceeds the limit of “Total,” the material shall be considered nonconforming.(F) Other Elements—Total shall be the sum of unspecified metallic elements 0.010 % or more, rounded to the second decimal before determining the sum.(G) If iron exceeds 0.45, manganese content shall