ASTM A278 PDF
ASTM A Standard Specification for Gray Iron Castings for Pressure- Containing Parts for Temperatures up to Degrees F. Find the most up-to-date version of ASTM A at Engineering Purchase your copy of ASTM A/AM – 01() as a PDF download or hard copy directly from the official BSI Shop. All BSI British.
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The test bars shall be cast in dried siliceous sand molds maintained at approximately room temperature. The tips of the flakes act as preexisting notches at which stresses concentrate and it therefore behaves in a brittle manner.
Iron Castings Properties – Foundry Source
Gray iron also experiences less solidification shrinkage than other cast irons that do not form a graphite microstructure. Alloy additions may be needed to obtain the higher-strength grades in heavy sections. Characteristic properties of Gray Iron are excellent machinability, good wear asttm, high vibration absorption, and good fluidity.
Iron castings are produced by a variety of molding methods and are available with a wide range of properties.
ASTM A278/A278M – 01(2015)
Click here to view all the property values for this datasheet as they were originally entered into MatWeb. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. Grey iron is sometimes spelled gray iron. Austempered ductile iron ADI provides twice the strength of conventional ductile iron at a given level of ductility.
Grey iron also has very good damping capacity a2278 hence it is often used as the base for machine tool mountings. Types of Gray Iron are commonly designated by a class number which indicates minimum tensile strength in thousands of pounds per square inch KSI. The cooling rate in any particular section factors heavily into the mechanical properties of the iron. Free Trade Publications, Click Here!
To achieve a fully ferritic matrix the alloy must be annealed. This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures. It can be cast in a wide range of casting sizes and section thickness; however, thinner sections may require annealing to obtain high ductility. In some applications, the finished component is tested in the manner in which it will be used. Gray iron high carbon equivalent.
For over 60 years, Carson Adtm continues to meet your raw and machined sand and investment casting needs with ISO certified facilities. The damping capacity of gray iron is about times higher than steel. Gray ironor grey cast ironis a type of cast iron that has a graphitic microstructure.
The majority of carbon is in the form of iron carbides making it very hard, brittle and in most cases unmachinable. The graphite takes aa278 the shape of a three-dimensional flake. It has a tensile strength comparable to many steel alloys and a modulus of elasticity between that of gray iron and steel. Views Read Edit View history.
Questions or comments about MatWeb? Cast iron Ferrous alloys Iron. The two specifications approach the task from different standpoints, but the concept essentially remains the same. For example, if gray iron, CGI and ductile iron have a similar composition, the relative damping capacity of gray iron is 1, CGI is 0. Abrasion Resistant Irons excel in applications with a high degree of wear and low impact. A typical chemical composition to obtain a graphitic microstructure is 2.
In heavy sections, its strength is reduced significantly. Grey cast iron’s high thermal conductivity and specific heat capacity are often exploited to make cast iron cookware and disc brake rotors. Chemical analysis shall be performed on each class of castings and shall meet the maximum requirement for carbon, phosphorus and sulfur. Malleable iron — In malleable iron, the graphite occurs as irregularly shaped nodules called temper carbon because it is formed in the solid state during heat treatment.
Historical Version s – view previous versions of standard. The different metals within this family are separated further into the following classifications:.
ASTM class 60 Standard gray iron test bars, as cast
Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. MatWeb is intended ashm personal, non-commercial use. It is the most machinable of cast irons, and it can be die-strengthened or coined to bring key dimensions to close tolerance limits.