Abstract
The authors have completed the quantitative analysis method of tellurium slightly contained in pig iron and cast iron.
We have made some experiments on the effect of tellurium on the properties of gray and white cast iron. Conforming to these results, we made the study from various angles on the chilled dies.
The results obtained are as followings : —
(1) Tellurium remains well in cast iron, when it was added just before pouring at temperature 1300∼1320°C.
(2) Remelting of cast iron containing tellurium, however, will make tellurium in uneffective.
(3) Mechanical properties of hyper-eutectoid cast iron will not be improved by the tellurium addition.
(4) The extent of 0.005% tellurium in cast iron is not effective. Satisfactory results will be obtained by the content of tellurium of 0.02∼0.03%.
(5) Tellurium prevents the graphitization of cast iron powerfully and also it turns flake graphite into eutectic graphite.
(6) Characteristics of cast iron containing tellurium are its high hardness, high tensile strength and high impact value wi th fine crystal structures.
(7) High hardness will be observed in Te-Cr-Cu alloy cast irons.
(8) Tellurium should not be mixed with mold sand or wash. It will be recommended to apply the Tompkin's method to heavy castings and the Austin's to light castings.
(9) Chilled iron dies containing tellurium have the following excellence compared with ordinary forged steel dies ; twice as long in life, finer surface of manufactures, less fire cracks and lower in manufacturing cost.
