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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A typical chemical composition to obtain a graphitic microstructure is 2. From Wikipedia, the free encyclopedia. Types of Gray Iron are commonly designated by a class number which indicates minimum tensile strength in thousands of pounds per square inch KSI.
Combining values from the two systems may result in non-conformance with the standard. These specifications give the minimum tensile and impact levels along with typical Brinell hardness values Table 5. For over 60 years, Carson Castings continues to 2a78 your raw and machined sand and investment satm needs with ISO certified facilities.
Gray iron above class 40 requires alloying to provide solid solution strengtheningand heat treating is used to modify the matrix. This provides the metal with considerable elasticity, impact resistance and high yield strength. The properties of all cast metals are influenced by the manner in which they solidify and cool. Gray Iron is commonly referred to as Cast Iron.
ASTM A278/A278M – 01(2015)
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. Questions or comments about MatWeb?
Strength and hardness are sensitive to section thickness in gray iron castings. Machining Cast Iron To efficiently machine cast irons, the appropriate tool material of the correct grade and shape must be selected. Ferritic malleable iron is produced to a lower strength range than pearlitic malleable iron but with higher ductility.
The silicon promotes good corrosion resistance and increased fluidity when casting. Ausferrite microstructures respond to shot peening, fillet rolling and grinding and lead to an increase in bending fatigue strength with favorable compressive residual stresses impacted on the surfaces. This specification covers gray iron for castings suitable for pressure-containing parts at elevated temperatures.
Iron Specifications – Jade Trading Casting Services | Jade Trading
Lower Classes of Gray Iron provide better machinability with higher classes offering strength and wear resistance. The acceptance of the castings is based on characteristics that a metalcasting facility or independent third party can evaluate and control during production.
It is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blockspump housings, valve bodies, electrical boxes, and decorative castings.
Grey Iron Compressor Head. Characteristic properties of Gray Iron are excellent machinability, good wear resistance, high vibration absorption, and good fluidity. Ductile Iron has steel like mechanical properties with the castability, machinability, and corrosion resistance of Gray Iron.
The test bars shall be cast in dried siliceous sand molds maintained at approximately room temperature. The two specifications approach the task from different standpoints, but the concept essentially remains a2778 same.
Excessive vibration causes inaccuracies in precision machinery and excessive wear on gear teeth and bearings. Free Trade Publications, Click Here! Austempering of ductile iron castings at higher temperatures produces ADI with lower strength and hardness, as well as higher ductility and toughness. SAE Standard Jc for aatm castings and similar applications identifies these five grades of ductile iron only by Brinell hardness.
Ductile Iron Link Pin. Or if you don’t have an account with us yet, then click here to register. In heavy sections, its strength is reduced significantly. Chemical analysis shall be performed on each class of castings and shall meet the maximum requirement for carbon, phosphorus and sulfur. Castings are intended for general engineering use.
We appreciate your input. Types of Specifications When mechanical properties are important, the most common procedure to qualify gray or ductile iron castings is to use astj standard test bar poured separately with the specified lot of general engineered castings. The cooling rate in any particular section factors heavily into the mechanical properties of the iron.
The graphite takes on the shape of a three-dimensional flake.
ASTM A – Standard for Gray Iron Castings for Pressure Containing Parts
Retrieved from ” https: The damping capacity of gray iron is about times higher than steel. It can be cast in a wide range of casting sizes and section thickness; however, thinner sections may require annealing to obtain high ductility.
The actual asgm of the metal in the casting will depend upon its characteristics and the cooling rate of the metal in its various sections. Iron used in supplying castings shall conform to the required tensile strength. Grey cast iron’s high thermal conductivity and specific heat capacity are often exploited to make cast iron cookware and disc brake rotors. In two dimensions, as a aatm surface, the graphite flakes appear as fine lines.
Only minor compositional differences to promote the desired matrix microstructure exist among the regular grades. Cast iron Ferrous alloys Iron.