Vibration can be critical in machinery and can cause unsatisfactory operation or even failure. Silicon also imparts corrosion and elevated temperature oxidization resistance to gray iron. Gray iron high carbon equivalent. However, for special applications some aspect of chemical composition may be specified to assure the suitability of the iron for a specific need. Increasing amounts of graphite result from increasing the total carbon content of the iron. How much graphite is present, the length of the flakes and how they are distributed in the matrix directly influence the properties of the iron. Metal Stamping Parts

Class 20 grey iron has a ferrite matrix and a high carbon equivalent. Properties determined from as-cast test bar The fracture toughness will generally vary with temperature, state of stress and strain-rate, all of which influence the amount of deformation, which precedes fracture. Questions or comments about MatWeb? Components made of materials with a high damping capacity can reduce noise such as chatter, ringing and squealing, and also minimize the level of applied stresses. The maximum stress that will allow this number of cycles is established as the endurance limit, or the fatigue strength or fatigue limit.

The damping capacity of gray iron is considerably greater than that of steel or other kinds of iron. Compression strength does correlate very well with hardness for all types of iron because hardness is essentially a compression test. Just like most other cast irons, it also has 2.

Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. I’m Online Chat Now. The basic strength and hardness of the iron is provided by the metallic matrix in which the graphite occurs.

Relative Damping Capacity Material.

Subscribe to Premium Services Searches: Data sheets for overmetals, plastics, ceramics, and composites. We appreciate your input. It is used for housings where the stiffness of the iroj is more important than its tensile strength, such as internal combustion engine cylinder blockspump housings, valve bodies, electrical boxes, and decorative castings.

Lroperties is the most commonly determined property of metal because it is a simple test and many of the useful properties of metal are directly rpoperties to its hardness. Green Sand Casting Process Machining: The amount of flake graphite present influences the two tests differently.


The fracture toughness will generally vary with temperature, state of stress and strain-rate, all of which influence the amount of deformation, which precedes fracture. Aluminium Die Casting Mating surfaces normally considered in steady contact can be caused to fret by vibration.

CNC machine, machining center, lathe, mill machine, drill machine, etc. For this reason, the sulfur content in iron is usually controlled within limits and with a selected ratio to irn manganese content since sulfur combines chemically with manganese to form manganese sulfide.

To get grey iron above class 40 requires alloying to provide solid solution strengthening. Subscribe to Premium Services Searches: Thus, the mechanical properties of the metal in a casting will depend on its shape, size and wall thickness as well as on the iron that is used to pour it. Class 80 is the highest class available for grey iron and it makes the iron have high tensile strength but low impact resistance because class 80 parts are more brittle. Questions or comments about MatWeb?

This behavior is attributed to the flake graphite structure of the gray iron, along with its propertiea stress-strain characteristics. Class 80 is the highest class available, but it is extremely brittle.

Comparison Table for Some Gray Iron Casting Grades

It is named after the gray color of the fracture it forms, which is due to the presence of graphite. In two dimensions, as a polished surface, the graphite flakes appear as fine lines. Gray irons can be alloyed to increase their strength and hardness as cast or to increase their response to hardening by heat treatment. Properties determined from as-cast test bar Questions or comments about MatWeb?

The matrix can be entirely ferrite for maximum machinability but the iron will have reduced wear resistance and strength. 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.

Within a class or type of gray iron, hardness is a good indicator of its engineering properties, but this relation is not useful between types of gray iron because differences in graphite structure have more of an effect on cats properties than on hardness. Class 20 grey iron has a ferrite matrix and a high carbon equivalent.

The Brinell hardness test is used for all irons because the Brinell test propertie is large enough to average the hardness of the constituents in the microstructure. It decreases these properties of the metallic matrix,however, the presence of the graphite provides several valuable characteristics to cast iron. Please click here if you are a supplier and would like information on how to add your listing to this material.


Gray Cast Iron ASTM A48 Class 20 30 GG20 SAE G Grey Iron Anti Rust Oil

In other projects Wikimedia Commons. The lower strength grades of gray iron can be consistently produced by simply selecting the proper melting stock.

If you have skype or whatsapp, pls tell me, we can chat more smoothly. Retrieved from ” https: This equation also, in effect, indicates that on the basis of percent by weight, the silicon and phosphorous contents of gray iron influence its tensile properties in the same manner as its total carbon content but only by one third as much.

MatWeb is intended for personal, non-commercial use. UNS F, 3g000, pearlitic, soft iron castings Vendors: Propeerties advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. The exceptionally high damping capacity of gray cast iron is one of the most valuable qualities of this material.

When the cross section of the remaining metal becomes insufficient to support the maximum load, complete failure occurs as it would under an excessive steady stress.

Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units.

Gray Cast Iron ASTM A48 Class 20 30 GG20 SAE G3000 Grey Iron Anti Rust Oil

Manganese in excess of this amount is a mild carbide stabilizer, refining the pearlite and increasing the hardness and tensile strength. From Wikipedia, the free encyclopedia. These differences in structure produce differences in mechanical properties.

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