Cast iron composition effects

Small variations in the composition of cast irons, or even the addition of small amounts of alloying elements, generally have little effect on the corrosion resistance. 

The chemical make-up of oxide substances is often very complex and the matrix frequently contains two or three compounds of almost equal concentration. The determination of individual interference effects is very complicated and time consuming, because the composition of these substances can be subject to wide variations. As in the case of steel, pig iron and cast iron the interference effects are generally not determined. 

Therefore, Fig. 15 suggests that reducing the grain size of TiC, Ti(C,N), or Ti(C,0)-reinforced composites may indeed increase the hardness and reduce the wear in turning hard cast iron, but the effect is limited, probably because of chemical... 

In the discussion which followed that paper (p. 361), one of the journal s editors, J.-J. Virey, pointed out that there were some products of inorganic chemistry that also had poorly defined compositions, notably the oils formed when cast iron was treated with acid, or when olefinic gases were burnt. He also pointed out that some chemical processes (e.g. Kirchhoff s conversion of starch into sugar with acid) resembled the effects of germination and that respiration could release simple materials such as carbonic acid and water. Thus the distinction between organic and inorganic chemistry was not as clearly defined as Beral had portrayed it, and it warranted further study. 

The use of FRP is convenient also in older metal constmctions, since the mechanical properties of composite materials are well suited to the stmctural features of buildings employing cast iron. The exceptional tensile strength of the fibers makes up for the low resistance of the cast iron and the corrosion resistance of both materials makes the intervention durable. The traditional techniques that rely on welding are unfavorable because fliey require flie complete disassembly of the work, along with an inevitable increase of costs and time consumption. It demonstrated, moreover, the effectiveness of flie application of FRP in improving the brittle behavior of cast iron. 

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