Rare earth treatment steel :
The ability of deoxidization of Lathanum(La), Cerium(Ce), Praseodymium(Pr) and Neodymium(Nd), under 1600 íŠ steel liquid, is stronger than that of Zirconium(Zr) and Aluminium(Al), so La, Ce, Pr and Nd are proved to be the very strong deoxidizer. While mischmetal is consisted of La, Ce, Pr, Nd, and other trace rare earth elements such as Samarium(Sm) & Yttrium(Y), hence mischmetal is the strong and ideal deoxidizer in steelmaking, from technical point, in which, what the ability of deoxidization increased by degrees is that La, Pr, Nd, Ce. Note : the ability of deoxidization of the alloying elements in steel liquid increased by degrees from Chromium(Cr), Manganese(Mn), Carbon(C), Silicon(Si), Vanadium(V), Titanium(Ti), Boron(B), Aluminium(Al), Zirconium(Zr) to Calcium(Ca).
Steel desulphurization, one of the aims of the addition of mischmetal into the steel is to control the sulphur sundries and its shape. It is often to add Mn while steelmaking, the coalescence Manganese(Mn) and Sulphur(S) can form the sulfuride sundries, which will be deformed while milling the steel, however what the addition of mischmetal in steel can produce the sulphuride and rare earth sulphuride & oxide, they keep its shapes unchangeable while milling steel, which may improve the steel property.
Mischmetal is used to control residual elements, thus influencing graphite morphology in ductile iron and also as an inclusion modifier(modification) in steelmaking.
With the continuous increases from the consumption of stainless steel and Low Alloy High Strength(LAHS) steel, it is predicted that the demand of rare earth alloying elements will increase largely.
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