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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Data sheets for overmetals, plastics, ceramics, and composites. Class 20 a2278 a high carbon equivalent and a ferrite matrix. SAE Standard Jc for automotive castings and similar applications identifies these five grades of ductile iron only by Brinell ast.
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. In some applications, the finished component is tested in the manner in which it will be used.
The two specifications approach the task from different standpoints, but the concept essentially remains the same. Although some production iron foundry facilities have established guidelines for their own capability in dimensional control, these controls are typically established through engineering based on the requirements of the application and the asstm of the end user.
Asttm of Gray Iron are commonly designated by a class number which indicates minimum tensile strength in thousands of pounds per square inch KSI. In heavy sections, its strength is reduced significantly. This page was last edited on 16 Novemberat The silicon promotes good corrosion resistance and increased fluidity when casting. Only minor compositional differences to promote the desired matrix microstructure exist among the regular grades.
Alloy aastm may be made to assist in controlling the matrix structure as-cast or to provide response to heat treatment. Gray iron is a common engineering alloy because of its relatively low cost and good machinabilitywhich results from the graphite lubricating the cut and breaking up the chips.
Alloys | Clinch River Casting
Machining Cast Iron To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. Ductile Iron Pillow Block.
Castings to be used at a axtm temperature range shall undergo heat treatment and cooling. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Questions or comments about MatWeb? Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron.
Class 80 is the highest class available, but it is extremely brittle.
The graphite also gives gray iron an excellent damping capacity because it absorbs the energy and converts it into heat. 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. 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.
New tool materials for economical machining of iron castings are in a continual state of improvement and development. For over 60 years, Carson Castings continues to meet your raw and machined sand and investment casting needs with ISO certified facilities.
The high-strength grades can be quenched and tempered by austempering.
MatWeb is intended for personal, non-commercial use. Grey Iron Compressor Body.
ASTM A278/A278M – 01(2015)
The iron is cast as a white iron of a suitable chemical composition to respond to the malleabilizing heat treatment. This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures.
Gray iron axtm, or grey cast ironis a type of cast iron that has a graphitic microstructure.
The tips of the flakes act as preexisting notches at which stresses concentrate and it therefore behaves in a brittle manner. It also has good galling and wear resistance because the graphite flakes self lubricate. To achieve a fully ferritic matrix the alloy must be annealed. Austempering of ductile iron castings at higher temperatures produces ADI with lower strength and hardness, as well as higher ductility and toughness.
Malleable iron is ideal for thin-sectioned components that require ductility. Grey cast iron’s high thermal conductivity and specific sstm capacity are often adtm to make cast iron cookware and disc brake rotors.