ASTM-A48/A48M:03(R2021) pdf free download – Standard Specification for Gray lron Castings.
11 .5 When castings are stress-relieved, annealed, or otherwise heat-treated, test bars shall receive the same thermal treatment and shall be treated adjacent to the castings they represent.
12. Number of Tests and Retests
12.1 The tension test shall be conducted in accordance wiLh Test Methods E8IE8M.
12.2 One tension test shall be performed on each lot and shall conform to the tensile requirements specified.
12.3 If the results of a valid test fail to conform to the requirements of this specifIcation, two retests shall be made. If either retest fails to meet the specification requirements, the castings represented by these test specimens shall he rejected. A valid test is one wherein the specimen has been properly prepared and appears to be sound and on which the approved test procedure has been followed.
12.4 If sufficient separately cast test pieces are not available, the manufacturer shall have the option of removing a test specimen from a location of representative casting, as agreed upon between the manufacturer and purchaser.
12.5 If the first test results indicate that a heat treatment is needed to meet the Lest requirements, the entire lot of castings and the representative test specimens shall be heat treated together. Testing shall proceed in accordance with 12.1 — 12.3.
12.6 If, after testing, a test specimen shows evidence of a defect, the results of the test may be invalidated and another made on a specimen from the same lot.
13. Tension Test Specimens
13.1 For test bar A. the tension test specimen A, as shown in Fig. 1, shall be machined concentric with the axis of the test bar.
13.2 For test bar B. the tension test specimen B, as shown in Fig. 1, shall be machined concentric with the axis of the test bar.
13.3 For test bar C, tension test specimens B or C, as shown in Fig. 1, shall be machined concentric with the axis of the test bar. Unless the size of the tension test specimen to be machined from lest bar C is specified in writing by the purchaser, the decision whether to use tension test specimen B or C shall he made by the manufacturer of the castings.
13.4 For test bar S. the nature and dimensions of the tension test specimen shall he determined by agreement between the manufacturer and purchaser.
14. Tension Test
14.1 Tension test specimens shall fit the holders of the testing machine in such a way that the load shall be axial.
14.2 The elapsed time from the beginning of loading in the tension test to the instant of fracture shall be not less than 15 s for test specimen A and not less than 20 s for specimens B and C.