The "bow of steel" in (A.V.) 2 Samuel 22:35 ; Job 20:24 ; Psalms 18:34 is in the Revised Version "bow of brass" (Heb. kesheth-nehushah). In Jeremiah 15:12 the same word is used, and is also rendered in the Revised Version "brass." But more correctly it is copper (q.v.), as brass in the ordinary sense of the word (an alloy of copper and zinc) was not known to the ancients.
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.
[N] indicates this entry was also found in Nave's Topical Bible
[S] indicates this entry was also found in Smith's Bible Dictionary
Bibliography InformationEaston, Matthew George. "Entry for Steel". "Easton's Bible Dictionary".