ASTM B208-14 (R2021) pdf free download.Standard Practice for Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and Continuous Castings.
1 .1 This practice establishes procedures for preparing test coupons and specimens (machined and unmachincd) for tension tests of copper alloys for sand, permanent mold, centrifugal and continuous castings.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This international standard was developed in accordance with in tel7zational!v recognized principles on standardiza (ion esblished in the I)ecision on Principles for the Developnient of In Wrn ational Standards, Guides and Recoin - mendauons issued by the World Trade Organization Technical Barriers to Trade (TBT) Coinmillee.
2. Referenced Documents
2. 1 ASTM Standards:
B846 Terminology for Copper and Copper Alloys
3. Terminology
3.1 Definitions of terms relating to copper alloys can he found in Terminology B846.
4. Significance and Use
4.1 The mechanical properties determined from test bars for sand, permanent mold, and centrifugal castings poured in accordance with this practice represent the properties of the metal going into castings poured from the same heat. These mechanical properties may not he the same as the properties of the corresponding castings because of the solidification effects of varying size, section, and design.
4.2 Test bars for continuous castings are taken from the castings and therefore represent the properties of the castings.
5. Test Coupons
5. 1 Sand castings—The test bar coupons shall he made by the same manufacturing process as the castings they represent wherever possible. If the castings are cast entirely in green sand, partial cores shall he permitted for the test bars but in no case shall chills be permitted. Unless otherwise agreed upon between the manufacturer and purchaser, test bars may be poured in cores on a production line. The use of filters in the gating system is permitted.
5. 1 . 1 Hiçh-Shriiiktn’e Sand-Cast Alloys—The test specimen coupons for copper casting alloys exhibiting high shrinkage during freezing and cooling shall be cast to the form and dimensions shown in Fig. I (a or b) or 2 (a or b). If specimens having threaded ends arc to be used in the tension tests, the length of the keel blocks in Fig. Ia may be reduced to 6¼ in. (159 mm). See Appendix XI for SI equivalents.
5. 1 .2 Low-Shrinkage Sand-cast Alloys—The test specimen coupons for copper casting alloys exhibiting low shrinkage during freezing and cooling shall be cast to the form and dimensions shown in Fig. 2 (A or B), Fig. 3, or Fig. 4 or as may be prescribed in the casting specifications.
5.2 Ce,itrifiigal Castings—Unless otherwise specified by the purchaser, the manufacturer shall pour the test bars in the same type of mold as the castings themselves. That is, test bars for sand mold castings shall be poured in sand molds, and test bars for chill mold castings shall be poured in chill molds.
5.2.1 The centrifugally cast test specimen coupons shall be cast to the tbrm and dimensions of Fig. 5a.
5.2.2 Static test bar coupons shall he cast in open keel block molds as dimensioned in Fig. 5b.ASTM B208-14 pdf download.