ASTM A278 PDF

Cast Test Bars Allowance may be made forreasonable pattern draft within the tolerances shown in Table 4. Test bars A, B, and C are all standard test bars in the form ofsimple cylinders. Test bar S is special and is intended for usewhere the standard bars are not satisfactory. The average grain size of thesand shall approximate that of the sand in which the castingsare poured. Molds for the test bars shall be approximately atroom temperature when poured.

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More A Castings shall be stress-relieved by placing them in a suitable furnace and heating them uniformly to the temperatures and for the times specified. Castings to be used at a particular temperature range shall undergo heat treatment and cooling.

Chemical analysis shall be performed on each class of castings and shall meet the maximum requirement for carbon, phosphorus and sulfur. Iron used in supplying castings shall conform to the required tensile strength. Separately cast test bars having the required dimensions shall be poured from the same lot as the castings represented.

The test bars shall be cast in dried siliceous sand molds maintained at approximately room temperature. Tension test shall be performed on each lot and materials shall conform to the tensile requirements specified. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Scope 1. 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 non-conformance with the standard.

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