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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Because the modulus of elasticity for gray iron is higher in compression than it is in tension, the use of standard structural formulas results in a conservative design.
ASTM A – Standard for Gray Iron Castings for Pressure Containing Parts
Gray iron also experiences less solidification shrinkage than other cast irons that do not form a graphite microstructure. However, the appropriate microstructure for the indicated hardness also is a requirement. Excessive vibration causes inaccuracies in precision machinery and excessive wear on gear teeth and bearings.
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These grades are a measure of the tensile strength-to- Brinell hardness ratio. 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. To see MatWeb’s complete data sheet for this material including material property data, metal compositions, material suppliers, etcplease click the button below.
Coated carbides, particularly those with aluminum oxide exteriors, are effective in production machining applications. In other projects Wikimedia Commons. Users requiring more precise data for a287 or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units.
Austempering of ductile iron castings w278 higher temperatures produces ADI with lower strength and hardness, as well as higher ductility and toughness. The different metals within this family are separated further into the following classifications:. Ductile Iron Pillow Block. The damping capacity of gray iron is considerably greater than that of steel and other iron types. In thin sections, the material can be hard and difficult to machine. The other gray iron specifications build off of these two primary specifications.
Types of Gray Iron are commonly designated by a class number which indicates minimum tensile strength in thousands of pounds per square inch KSI. Iron used in supplying castings shall conform to the required tensile strength.
SAE Standard Jc for automotive castings and similar applications identifies these five grades of ductile iron only by Brinell hardness.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. There is an insignificant amount of graphite present in Abrasion Resistant Irons. 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.
In two dimensions, as a polished surface, the graphite flakes appear as fine lines.
The individual design of a casting the molding process, the way the molten metal is introduced into the cavity and the pouring temperature determines the rate of cooling in the various parts of an iron casting. It is named after the gray color of the fracture it forms, which is due to the presence of graphite.
The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either as cast or by heat treatment.
A Class ASTM :: Total Materia
Login to see your most recently viewed materials here. Cast iron is a generic term that designates a family of metals.
The two w278 approach the task from different standpoints, but the concept essentially remains the same. This provides the metal with considerable elasticity, impact resistance and high yield strength.
ASTM A278/A278M – 01(2015)
We appreciate your input. The graphite also gives gray iron an excellent damping capacity because it absorbs the energy and converts it s278 heat. To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. Tension test shall be performed on each lot and materials shall conform to the tensile requirements specified.
This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures. As its name implies, it has a high degree of ductility.