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ASTM A319, A126, A278 - Standards for Gray Iron Castings
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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