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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Iron used in supplying castings shall conform to the required tensile strength. Higher strength gray a2778, up to class 40, have lower carbon equivalents and a pearlite matrix. The other gray iron specifications build off of these two primary specifications. 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.
As its name implies, it has a high degree of ductility.
ASTM A278/A278M – 01(2015)
In ashm projects Wikimedia Commons. Grey Iron Compressor Head. Login to see your most recently viewed materials here. Gray iron above class 40 requires alloying to provide solid solution strengtheningand heat treating is used to modify the matrix. In some applications, the finished component is tested in the manner atm which it will be used. Ductile iron has the ability to be used as-cast and without heat treatments or other further refining.
Ductile Iron Pillow Block. 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.
Abrasion Resistant Irons are low in silicon and are generally alloyed with Nickel and Chrome. Alloy additions may be needed to obtain the higher-strength grades in heavy sections. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of asfm standard.
Tension test shall be performed on each lot and materials shall conform to the tensile requirements specified. Only minor compositional differences to promote the desired matrix microstructure exist among the regular grades. Cast iron is a generic term that designates a family of metals. Xstm from ” https: Castings to be used at a particular temperature range shall undergo heat treatment and cooling. The tips of the flakes act as preexisting notches at which stresses concentrate and asm therefore behaves in a brittle manner.
ADI Properties Austempering of ductile iron castings at higher temperatures produces ADI with lower strength and hardness, as well as higher ductility and toughness. Abrasion Resistant Irons excel in applications with a high degree of wear and low impact. Historical Version s – view previous versions of standard.
Cast iron Ferrous alloys Iron. Gray iron high carbon equivalent. The graphite takes on the shape of a three-dimensional flake. The three numbers in the Ductile Iron designation represent the physical properties of the iron. MatWeb is intended for personal, non-commercial use. The silicon promotes good corrosion resistance and increased fluidity when casting.
Ferritic malleable iron is produced to a lower strength range than pearlitic malleable iron but with higher ductility.
Strength and hardness are sensitive to section thickness in gray iron castings. Views Read Edit View history. Combining values from the two systems may result in non-conformance with the standard.
This page was last edited on atm Novemberat It also has good galling and wear resistance because the graphite flakes self lubricate. 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. The graphite also gives gray iron an excellent damping capacity because it absorbs the energy and converts it into heat.
The different grades of ductile iron castings are produced by controlling the matrix structure around the graphite either as cast or by heat treatment. The two specifications approach the task from different standpoints, but the concept essentially remains the atm.
Property Data This page displays only the text of a material data sheet.
The cooling rate in any particular section atsm heavily into the mechanical properties of the iron. Austempered ductile iron ADI provides twice the strength of conventional ductile iron at a given level of ductility.
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. The acceptance of the castings is based on characteristics that a metalcasting facility or independent third party can evaluate and control during production.
Grey Iron Compressor Body. The majority of carbon is in the form of iron carbides making it very hard, brittle and in most asfm unmachinable. We appreciate your input.
ASTM A – Standard for Gray Iron Castings for Pressure Containing Parts
The actual properties of the metal in the casting will depend upon its characteristics and the cooling rate of the metal in its various sections. Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron.
The different metals within this family are separated further into the following classifications:.