ASTM B85/B85M: Standard Specification for Aluminum-Alloy Die Castings. With respect to mechanical properties, alloys A, and are substantially inter- changeable. Sources: ASTM Ba; Aluminum Association. Sources: ASTM Ba; ASM; SAE; Wabash Alloys. E Registration or REACH ( the European Union]s Directive on Registration, Evaluation, and Authorization o .
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.
Thirteen of sstm most commonly die cast alloy compositions are speci? The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.
Current edition approved April 10, Originally approved in Last previous edition approved in as B 85 — If, however, the presence of other elements is suspected, or indicated in the course of routine analysis, v85 analysis shall be made to determine that the total of these other elements are not present in excess of speci?
B For astmm of acceptance and rejection, the observed value or calculated value awtm from analysis should be rounded off to the nearest unit in the last right-hand place of?
C Limits are in percent maximum unless shown otherwise. Die castings of alloys A UNS designations were established in accordance with Practice E The producer may analyze samples for trace elements not speci?
G With respect to mechanical properties, alloys A Location of ejector pin marks or parting lines shall be at the option of the producer; unless speci? Axtm shall be speci? Additions of small amounts of modi? Except as otherwise speci? The purchaser shall have the right to aatm any of the inspections and tests set forth in this speci? Quality assurance standards shall be agreed upon between the producer or supplier and purchaser at the time a contract or order is placed. Die castings inspected by b885 method shall be so marked or handled during the?
The producer or supplier may use a system of statistical quality control for such examinations.
Conformance shall be determined by the producer by analyzing samples taken at the time castings are made. If the producer has determined the chemical composition of the metal during the course of manufacture, he shall not be required to sample and analyze the?
Sampling shall be in accordance with Practices E 88 or Eor both. Other methods may be used only when no published ASTM test method is available. In case of dispute, the methods of analysis shall be agreed upon between the producer and the purchaser. When tension or impact tests are made, the tension test specimen shown in Fig. Dimensions, Mass, and Permissible Variations The number and extent of imperfections shall not exceed those speci?
The standards or requirements may consist of radiographs in accordance with Reference Radiographs Ephotographs or sectioned die castings.
All tests and inspection shall be so conducted as not to interfere unnecessarily with the operation of the works. Rejection and Retest The producer or supplier shall be responsible only for replacement of the rejected castings to the purchaser. As much of the rejected original material as possible shall be returned to the producer or supplier.
The marking shall consist of raised Arabic numerals, and when applicable capital letters, cast integral. The location of the identi? When the location is not speci? Packaging and Package Marking Each package shall contain only one type of item unless otherwise agreed upon.
Marking for shipment shall be in accordance with Fed. The applicable levels shall be as speci? Characteristics of Die Casting Alloys The characteristics are rated from 1 to 51 being the best and 5 being the least desirable for that sstm.
In considering these ratings, it should be noted that all the alloys have sufficiently good characteristics to be accepted by users and producers of die castings. Hence the rating for each characteristic is a relative measure of that attribute compared to the same attribute in another alloy. For the products described, mechanical property limits for the respective size ranges are based on the analyses of at least data from standard production material with no more than ten data from astn given lot.
All tests are performed in accordance with the appropriate ASTM test methods. A designation not in con? Unalloyed aluminum contains a minimum of A rating of 1 gives the best performance, 5 the poorest performance.
No one alloy is xstm in all categories. A rating of 5 in any one or more categories does not rule an alloy out of commercial usefulness if its other attributes are especially favorable. However, ratings of 5 may present manufacturing difficulties.
B Die castings are not usually solution heat treated. Low temperature aging treatments may be used for stress relief or dimensional stability.
Die castings are not generally gas or arc welded or brazed. D Ability of alloy to bb85 stresses from contraction while cooling through hot-short or brittle temperature range. E Ability of molten alloy to? F Ability of molten alloy to? Ratings given for h85 are based on nominal iron compositions of approximately 1. G Based on resistance of alloy in standard type salt spray test. H Composite rating based on ease of cutting, chip characteristics, quality of?
ASTM B85 Grade SC84B
I Composite rating based on ease and speed of polishing and quality of? J Ability of the alloy to take and hold an electroplate applied by present standard methods. K Rated on lightness xstm color, brightness and uniformity of clear anodized coating applied in sulphuric acid electrolyte. Generally aluminum die castings are unsuitable for light color anodizing where pleasing appearance is required.
ASTM International – Standard References for ASTM B85 / B85M – 18e1
L Rated on combined resistance of coating and base alloy to corrosion. Different machines and dies continue to be necessary for die castings and test bars. Comparison between static breakdown or proof tests and the mechanical properties of separately die cast test bars will show that test bars made in a different machine in a different die have no correlation with the die casting other than a common chemical TABLE X2. Moore Specimen, cycles, ksi MPa 20 18 20 20 It should be thoroughly understood that the data in Table X2.
For this reason, it is considered that the only practical method qstm mechanical property control is proof testing the h85 die casting. The derived SI unit for force is the newton Nwhich is de?
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