subject: Astm A319, A126, A278 - Standards For Gray Iron Castings [print this page] ASTM A319 - 71(2011) Standard Specification for Gray Iron Castings for Elevated Temperatures for Non Pressure Containing Parts
Abstract: This specification covers gray iron castings exposed to elevated temperatures for non-pressure containing parts such as grate bars, stoker links, stoker parts, oil still furnace parts, firebox parts, ingot molds, glass molds, caustic pots, and metal melting pots. The three classes of gray iron covered here are: Class I, possessing superior thermal shock resistance; Class II, possessing average thermal shock resistance and moderately good tensile strength; and Class III, possessing a higher tensile strength than either Classes I or II. It is the intention of this specification to classify the irons in accordance with their carbon content equivalent, wherein the equation for its calculation is given herein.
ASTM A126 - 04 (2009) Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings
Abstract: This guide covers standard specification for three classes of gray iron for castings intended for use as valve pressure retaining parts, pipe fittings, and flanges. Chemical analysis shall be performed in each lot and shall conform to the required chemical composition for phosphorous and sulfur. Tension test shall be conducted on each class of gray iron castings and shall conform to the specified values of tensile strength. Tension test specimens shall have threaded ends and shall conform to the prescribed dimensions.
ASTM A278 - 01 (2011) / A278M - 01 (2011) Standard Specification for Gray Iron Castings for Pressure Containing Parts for Temperatures Up to 650 176F (350 176C)
Abstract: This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures. 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.
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