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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ASTM A278/A278M – 01(2015)
Ductile Iron Pillow Block. Only q278 compositional differences to promote the desired matrix microstructure exist among the regular grades. Grey iron also has very good damping capacity and hence it is often used as the base for machine tool mountings.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. It can be cast in a wide range of casting sizes and section thickness; however, thinner sections may require annealing to obtain high ductility. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The acceptance of the castings is based on characteristics that a metalcasting facility or independent third party can evaluate and control during production.
Click here to view all the property values for this datasheet as they were originally entered into MatWeb. The three numbers in the Ductile Iron designation represent the physical properties of the iron. The properties of all cast metals are influenced by the manner in which they solidify and cool. Or if you don’t have an account with us yet, then click here to register.
It is ast, 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. Another factor affecting graphitization is the solidification rate; the slower the rate, the greater the time for the carbon to diffuse and accumulate into graphite.
We appreciate your input. A728 over 60 years, Carson Castings continues to meet your raw and machined sand and investment casting needs with ISO certified facilities. Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron. Please contact us at webmaster matweb. Ductile Iron Link Pin.
To achieve a fully ferritic matrix the alloy must be annealed.
The damping capacity of gray iron is about times higher than steel. Machining Cast Iron To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. For example, pressure-containing parts can be hydraulically proof tested.
Coated carbides, particularly those with aluminum oxide exteriors, are effective in production machining applications. From Wikipedia, the free encyclopedia.
Ausferrite microstructures respond to shot peening, fillet rolling and grinding and lead to a2278 increase in bending fatigue strength with favorable compressive residual stresses impacted on the surfaces. Chemical analysis shall be performed on each class of castings and shall meet the maximum requirement for carbon, phosphorus and sulfur.
SAE Standard Jc for automotive castings and similar applications identifies these five grades of ductile iron only by Brinell hardness. 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.
Cast iron is a generic term that designates a family of metals. Castings to be used at a particular temperature range shall undergo heat treatment and cooling. Combining values from the two systems may result in non-conformance with the standard.
The high-strength grades can be quenched and tempered by austempering. Lower Classes of Gray Iron provide better machinability with higher classes offering strength and wear resistance. It is the most machinable of cast irons, and it can be die-strengthened or coined to bring key dimensions to close tolerance limits.
The two specifications approach the task from different standpoints, but the concept essentially remains the same. Types of Specifications 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.
Alloys | Clinch River Casting
Iron used in supplying castings shall conform to the required tensile strength. This abstract is a brief summary of the referenced standard. In heavy sections, its strength is reduced significantly. In thin sections, the material can be hard and difficult to machine. Alloy additions may be made to assist in controlling the matrix structure as-cast or to provide response to heat treatment.
The graphite takes on the shape of a three-dimensional flake. To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. Austempered ductile iron ADI provides twice the strength of conventional ductile iron at a given level of ductility. The name, Gray Iron, is derived from the characteristic gray color of the casting when fractured.
A moderate cooling rate forms a more pearlitic matrix, while a fast cooling rate forms a more ferritic matrix.