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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These grades are a measure of the tensile strength-to- Brinell hardness ratio.
ASTM class 60 Standard gray iron test bars, as cast
The majority of carbon is in the form of iron carbides making it very hard, brittle and in most cases unmachinable. To achieve a fully ferritic matrix the alloy must be annealed.
Retrieved from ” https: In some applications, the finished component is tested in the manner in which it will be used. Alloy additions may be needed to obtain the higher-strength grades in heavy sections. It also has good galling and wear resistance because the graphite flakes self lubricate.
Castings to be used at a particular temperature range shall undergo heat treatment and cooling. 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.
Castings shall be stress-relieved by placing them in a suitable furnace and heating them uniformly to the temperatures and for the times specified. The high-strength grades can be quenched and tempered by austempering. 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.
Property Comparisons for Gray Iron Classes. In thin sections, the material can be hard and difficult to machine. Click here to view all the property values for this datasheet as they were originally entered into MatWeb. Gray iron above class 40 requires alloying to provide solid solution strengtheningand heat treating is used to modify the matrix. Gray ironor grey cast ironis a type of cast iron that has a graphitic microstructure. Abrasion Resistant Irons are low in silicon and are generally alloyed with Nickel and Chrome.
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.
Ausferrite microstructures respond to shot peening, fillet rolling and grinding and lead to an increase in bending fatigue strength with favorable compressive residual stresses impacted on the surfaces. This provides the metal with considerable elasticity, impact resistance and high yield strength. Iron castings are produced by a variety of molding methods and are available with a wide range of properties.
A Class ASTM :: Total Materia
When mechanical properties are important, the most common procedure to qualify gray or ductile iron castings is to use a standard test bar poured separately with the specified lot of general engineered castings.
The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either a27 cast or a78 heat treatment. Login to see your most recently viewed materials here. Lower Classes of Gray Iron provide better machinability with higher classes offering strength and wear resistance.
ASTM A278/A278M – 01(2015)
The damping capacity of gray iron is about times higher than steel. Alloy additions may be made to assist in controlling the matrix structure as-cast or to provide response to heat treatment. Grey Iron Compressor Head.
Views Read Edit View history. Abrasion Resistant Irons excel in applications with a high degree of wear and low impact.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.