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| ASTM Standard E716 | |||||||||||||||||||||||
The ASTM E716 standard describes best practices for obtaining representative samples for quantometer analysis. You can obtain a copy of this standard at www.astm.org Please be aware of the safety disclaimer in section 1.3. It is the responsibility of the producing plant to ensure employee safety. Review the entire standard with special emphasis on the following sections: |
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Section 5.2 discusses the significant benefits from using the "Type B" center pour mold. See the drawing below. This mold produces a sample that can be analyzed along a band just inside its circumference.
Samples made from this ASTM mold are approximately 64mm in diameter and 6-13 mm thick. Samples greater than 65mm in diameter are not accepted at Logan. Producing plants should use the ASTM mold. Section 7.1.1 discusses the importance of machining to the correct depth in the sample. Machining to a depth of 14 to 22% of the original sample thickness presents a surface that will provide a representative chemistry (depending on the analytical capability of the spectrometer) of the bulk metal. Simple studies have shown that machining from the sprue side provides analysis less susceptible to mold and metal temperature. Each producing plant must develop best practices so that the chemistry provided to Logan accurately represents the bulk metal chemistry. Training / Reference Materials Quantometer Sample Quality Guide (.pdf file) Chemistry and Chemical Analysis (.pdf file)
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