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Normas ASTM – AENOR
ASTM B618/B618M-18

ASTM B618/B618M-18

Standard Specification for Aluminum-Alloy Investment Castings

Fecha:
2018-08-03 /Historical
Superseeded by:
Abstract:

This specification covers aluminum-alloy investment castings. Unless otherwise specified, only aluminum alloy conforming to the requirements shall be used in the remelting furnace from which molten metal is taken for pouring directly into castings. The castings shall conform to the chemical composition requirements specified. The determination of chemical composition shall be made in accordance with suitable chemical (test methods E 34), or spectrochemical (test methods E 607 and E 1251) methods. Unless otherwise specified, only aluminum alloy conforming to the requirements shall be used in the remelting furnace from which molten metal is taken for pouring directly into castings. Foundry control shall consist of examination of castings by radiographic or other approved methods for determining internal discontinuities until the gating, pouring, and other foundry practices have been established to produce castings meeting the required quality standards. The tensile properties shall be determined in accordance with test methods B 557 and B 557M. Heat treatment of castings shall be performed in accordance with practice B 917/B 917M.

Scope:

1.1 This specification covers aluminum-alloy investment castings designated as 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 “Designations and Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (known as the ‘Pink Sheets’),” the composition limits registered with the Aluminum Association and published in the “Pink 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 not be less than one half of the iron content.
(H) The Aluminum Association ruling on the number of decimal places to which Mg percent is expressed is exempted for some long standing alloys. See A2.2.6.
(I) 710.0 formerly A712.0, 712.0 formerly D712.0, 851.0 formerly A850.0, 852.0 formerly B850.0.
(J) For a cross reference of current and former alloy designations see the Aluminum Association’s “Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (The Pink Sheets).”

1.2 This specification is for aluminum-alloy investment castings used in general purpose applications. It may not address the mechanical properties integrity testing and verification required for highly loaded or safety critical applications.

1.3 Alloy and temper designations are in accordance with ANSI H35.1/H35.1 (M).

1.4 Unless the order specifies the “M” specification designation, the material shall be furnished to the inch-pound units.

1.5 For acceptance criteria for inclusion of new aluminum and aluminum alloys and their properties in this specification, see Annex A1 and Annex A2.

1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Keywords:
aluminum; investment casting ;
57,64
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