1) US and Bethlehem 2) Becomes inflexible 3) Becomes resolved 4) Braces 5) Braces against 6) Braces for impact 7) Certain stocks 8) Fills with resolution 9) Fortifies 10) Fortifies or braces 11) Girds 12) Hardens 13) Iron products 14) Makes hard 15) Makes resolute 16) Makes strong 17) Makes tough 18) Market sector Found on https://www.crosswordclues.com/clue/steels