- found: Wikipedia, Oct. 11, 2012 (Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. Element category: transition metal)
- found: NASA thesaurus, 2012, via WWW, Mar. 12, 2013 (under refractory metals: chromium)
- found: International journal of refractory metals and hard materials home page, Mar. 12, 2013 (The refractory metals comprise selected metals with melting points around 2000°C and higher, with similar powder metallurgical production and application. This includes the following metals and their alloys: Tungsten, Molybdenum, Chromium, Tantalum, Niobium and Rhenium.)
- found: Refractory metals: niobium, molybdenum and rhenium, via Key to Metals website, Mar. 12, 2013 (The refractory metals are conveniently described as those which, first of all, melt at temperatures well above the melting points of the common alloying bases, iron, cobalt, and nickel. Second, it seems appropriate to consider the refractory metals as those which have higher melting points than do titanium and zirconium, which are used chiefly at intermediate temperatures. On the other hand, chromium is usually classed as a refractory metal.)
- 1986-02-11: new
- 2014-03-28: revised
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