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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It also has good galling and wear resistance because the graphite flakes self lubricate. Retrieved from ” https: The majority of carbon is in the form of iron carbides making it very hard, brittle and in most cases unmachinable. 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. Ductile Iron Pillow Block.

SAE Standard Jc for automotive castings and similar applications identifies these five grades of ductile iron only by Brinell hardness. Grey iron is sometimes spelled gray iron. The silicon promotes good corrosion resistance and increased fluidity when casting.

The damping capacity of gray iron is considerably greater than that of steel and other iron types. Free Trade Publications, Click Here! The acceptance of the castings is based on characteristics that a metalcasting facility or independent third party can evaluate and control during production. Types of Specifications When mechanical properties are important, the most common a728 to qualify gray or ductile iron castings is to use a standard test bar poured separately with the specified lot of general engineered castings.

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The other gray iron specifications build off of these two primary a2778.

Gray iron also experiences less solidification shrinkage than other cast irons that do not form a graphite microstructure. It is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blockspump housings, valve bodies, electrical boxes, and decorative castings. The properties of all cast metals are influenced by the manner in which they solidify and cool. However, the appropriate microstructure for the indicated hardness also is a requirement.

The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either as cast or by heat treatment. In two dimensions, as a polished surface, the graphite flakes appear as fine lines.

Historical Version s – view previous versions of standard. Asfm iron above class 40 requires alloying to provide solid solution strengtheningand heat treating is used to modify the matrix.

ASTM A278/A278M – 01(2015)

ast Ferritic malleable iron is produced to a lower strength range than pearlitic malleable iron but with higher ductility. 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.

Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron. Property Data This page displays only the text of a material data sheet. In other projects Wikimedia Commons. Ductile iron has the ability to be used as-cast and without heat treatments or other further refining. a2788


Alloys | Clinch River Casting

Gray iron high carbon equivalent. The name, Gray Iron, is derived from the characteristic gray color of the casting when fractured.

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By using this site, qstm agree to the Terms of Use and Privacy Policy. However, ductile iron is replacing malleable iron in many applications because the engineering properties of ductile iron castings are almost identical to that of malleable iron, and ductile iron does not require extensive heat treatment to precipitate graphite.

This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures. Subscribe to Premium Services Searches: For example, the number in a Class 30 gray iron refers to the minimum tensile strength in ksi.

Combining values from the two systems may result in non-conformance with the standard. For example, pressure-containing parts aatm be hydraulically proof tested. New tool materials for economical machining of iron castings are in a continual state of improvement and development.

Excessive vibration causes inaccuracies in precision machinery and excessive wear on gear teeth and bearings. We appreciate your input.