To reduce the grain size the present invention includes {HEAD ~ an additive} constituted by {TAIL ~ a rare earth} or a mixture of rare earths, e.g. misch metal at between 0.001% and 1% by weight, and preferably at 0.2% 
constituted by
To reduce the grain size the present invention includes { HEAD ~ an additive } constituted by { TAIL ~ a rare earth } or a mixture of rare earths , e.g. misch metal at between 0.001 % and 1 % by weight , and preferably at 0.2 %
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH