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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Another asttm affecting graphitization is the solidification rate; the slower the rate, the greater the time for the carbon to diffuse and accumulate into graphite. These grades are a measure of the tensile strength-to- Brinell hardness ratio.

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The cooling rate in any particular section factors heavily into the mechanical properties of the iron. 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.

It is the most machinable of cast irons, and it can be die-strengthened or coined to bring key dimensions to close tolerance limits. Malleable iron — In malleable iron, the graphite occurs as irregularly shaped nodules called temper carbon because it is formed in the solid state during heat treatment.

Combining values from the two systems may result in non-conformance with the standard. As its name implies, it has a high degree of ductility. The class then is identified as a grade. asfm

Machining Cast Iron To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. Please contact us at webmaster matweb. There is an insignificant amount of graphite present in Abrasion Resistant Irons.

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Ductile iron has the ability to be used as-cast and without heat treatments or other further refining. The damping capacity of gray iron is about times higher than steel. Class 20 has a asm carbon equivalent and a ferrite matrix. Free Trade Publications, Q278 Here!

From Wikipedia, the free encyclopedia. Subscribe to Premium Services Searches: Ductile Iron Pillow Block.

It has a tensile strength comparable to many steel alloys and a modulus of elasticity between that of gray iron and steel. Only minor compositional differences to promote the desired matrix microstructure exist 2a78 the regular grades. This abstract is a brief summary of the referenced standard. Characteristic properties of Gray Iron are excellent machinability, good wear resistance, high vibration absorption, and good fluidity.

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Property Comparisons for Gray Iron Classes. Retrieved from ” https: 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.

Or if you don’t have an account with us yet, then click here to register. This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures. Gray ironor grey cast ironis a type of cast iron that has a graphitic microstructure. These specifications give the minimum tensile and impact levels along with typical Brinell hardness values Table 5.

Excessive vibration causes inaccuracies in precision machinery and excessive wear on gear teeth and bearings. Alloy additions may be needed to obtain the higher-strength grades in heavy sections. Gray iron also experiences less solidification shrinkage than other cast irons that do not form a graphite microstructure.

Grey Iron Compressor Body. For example, pressure-containing parts can be hydraulically proof tested. The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either as cast or by heat treatment.

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ASTM A278/A278M – 01(2015)

Coated carbides, particularly those with aluminum oxide exteriors, are effective in production machining applications. There are no generally accepted standards for the surface finish, machining allowances or dimensional tolerances.

In some applications, the finished component is tested in the manner in which it will be used. Castings shall be stress-relieved by placing them in a suitable furnace and heating them uniformly to the adtm and for the times specified.

Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. Gray Iron is commonly referred to as Cast Iron. Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron.

Link to Active This link will always route to the current Active version of the standard. Ductile Iron is commonly known as Nodular Iron. Historical Version s – view previous versions of standard. The majority of carbon is in the form of iron carbides making it very hard, brittle and in most cases unmachinable. Property Data This page displays only the text of a material data sheet.

Ferritic malleable iron is astk to a lower strength range than pearlitic malleable iron but with higher ductility. Ductile Iron Link Pin. 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. We also ask that you refer to MatWeb’s terms of use regarding this information. MatWeb is intended for personal, non-commercial use.

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