Abstract
Cast Iron FC250 with phosphorus alloy is used as electrode connector in the aluminum electrolysis process at PT. Indonesia Asahan Aluminium (Inalum), that is used to connect the rod with carbon anode. It will be crushed after the carbon anode dimension is reduced, that takes approximately 30 days. In order to make crushing process easier, phosphorus alloy then added into such FC250. The objective of the study is determining phosphorus effect on FC 250. The methodology consists of determine the test specimens, initiate such specimen of casting by varying the amount of phosphorus percentage of 0.3%, 0.5%, 0.7% and 0.9%, then perform mechanical testing and microstructure observation on each specimen. The result is, as the percentage of phosphorus in FC 250 increased, so its hardness value whereas the value of the tensile strength even decreased. Form the microstructure point of view, the “steadit” increased as well in line with the rise of phosphorus.
Highlights
Gray cast iron is a material that is widely used in industry because it has several advantages, including; easy to pour, easy machining process, is able to dampen vibrations well, the strength is high enough and the price is relatively cheap
In the chart above can be seen that the tensile strength values have a declining graph of the percentage of phosphorus 0,42%, 0.81 %, 1.06 and 1.12 % %
It is inversely proportional to the hardness value using methods a Brinell
Summary
Gray cast iron is a material that is widely used in industry because it has several advantages, including; easy to pour , easy machining process , is able to dampen vibrations well , the strength is high enough and the price is relatively cheap. FC 250 is a gray cast iron with lamellar graphite which has a minimum tensile strength of 250 MPa. The content of the alloy material in FC 250 , among others; Carbon ( C ) 3.4 % , silicon ( Si ) 2.0 % and phosphorus (P) 0.1-0.5 % , and the addition of manganese ( Mn ) depending on the desired microstructure. Occurs in two distinct forms in cast irons with more than 0,06 % phosphorus. The pseudo-binary form is the normal form, consisting of ferrite and iron-phosphide (Fe3P). The pseudo-binary form is the normal form, consisting of ferrite and iron-phosphide (Fe3P). [2]
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