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.
|Published (Last):||4 May 2004|
|PDF File Size:||7.29 Mb|
|ePub File Size:||3.42 Mb|
|Price:||Free* [*Free Regsitration Required]|
Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron. SAE Standard Jc for automotive castings and similar applications identifies these five grades of ductile iron only by Brinell hardness. The properties of all cast metals are influenced by the manner in which they solidify and cool.
The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either as cast or by heat treatment.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as a28 of the standard. These grades are a measure of the tensile strength-to- Brinell hardness ratio.
ASTM A278/A278M – 01(2015)
It has a tensile strength comparable to many steel alloys and a modulus of elasticity between that of gray iron and steel.
We appreciate your input. For astk, if gray iron, CGI and ductile iron have a similar composition, the relative damping capacity of gray iron is 1, CGI is 0.
ADI Properties Austempering of ductile iron castings at aatm temperatures produces ADI with lower 2a78 and hardness, as well as higher ductility and toughness. From Wikipedia, the free encyclopedia. Gray iron is a common engineering alloy because of its relatively low cost and good machinabilitywhich results from the graphite lubricating the cut aatm breaking up the chips. 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.
Iron castings are produced by a variety of molding methods and are available with a wide range of properties. Data sheets for overmetals, plastics, ceramics, and composites. For over 60 years, Carson Castings continues to meet your raw and machined sand and investment casting needs with ISO certified facilities. Property Data This page displays only the text of a material data aetm. In heavy sections, its strength is reduced significantly.
To achieve a fully ferritic matrix the alloy must be annealed. Class 80 is the highest class available, but it is extremely brittle.
Iron Specifications – Jade Trading Casting Services | Jade Trading
Or if you don’t have an astn with us yet, then click here to register. However, the appropriate microstructure for the indicated hardness also is a requirement. Machining Cast Iron To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected.
These specifications give the minimum tensile and impact levels along with typical Brinell hardness values Table 5.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. It is the most machinable of w278 irons, and it can be die-strengthened or coined to bring key dimensions to close tolerance limits.
Iron used in supplying castings shall conform to the required tensile strength. Grey Iron Compressor Body. Abrasion Resistant Irons excel in applications with a high degree of wear and low impact. The acceptance of the castings is based on characteristics that a metalcasting facility or independent third party can evaluate and control during production.
Subscribe to Premium Services Searches: The graphite has no appreciable strength, so they can be treated as voids.
Grey cast iron’s high thermal conductivity and asrm heat capacity are often exploited to make cast iron cookware and disc brake rotors.
The majority of carbon is in the form of iron carbides making it very hard, a78 and in most cases unmachinable. Austempering of ductile iron castings at higher temperatures produces ADI with lower 2a78 and hardness, as well as higher ductility and toughness. A moderate cooling rate forms a more pearlitic matrix, while a fast cooling rate forms a more ferritic matrix. Ductile iron has the ability to be used as-cast and without heat treatments or other further refining.
The high-strength grades can be quenched and tempered by austempering. Ausferrite microstructures respond to shot peening, fillet rolling and grinding and lead to an increase in bending fatigue strength with atsm compressive residual stresses impacted on the surfaces.
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.
Ductile Iron Link Pin. Casting Processes The properties of all cast metals are influenced by the manner in which they solidify and cool.
ASTM A – Standard for Gray Iron Castings for Pressure Containing Parts
Grey iron — Flake graphite provides gray iron with unique properties such as excellent machinability at hardness levels that produce superior wear-resistant characteristics, the ability to resist galling and excellent vibration damping. To see MatWeb’s complete data sheet for this material including material property data, metal compositions, material suppliers, etcplease click the button below.
Link to Active This link will always route to the current Active version of the standard. 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. 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 needs of the end user.
Retrieved from ” https: Combining values from the two systems may result in non-conformance with the standard. Coated carbides, particularly those with aluminum oxide exteriors, are effective in production machining applications. Castings shall be stress-relieved by placing them in a suitable furnace and heating them uniformly to the temperatures and for the times specified.