For the remainder, the powder can contain {HEAD ~ the conventional impurities} of {TAIL ~ a steel melt} 
of
For the remainder , the powder can contain { HEAD ~ the conventional impurities } of { TAIL ~ a steel melt }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL