What does the word steel mean?

Usage examples for steel

  1. Kurt had arms of steel. – The Desert of Wheat by Zane Grey
  2. Slowly, by agony of effort, she approached her bosom to the steel. – The Life and Death of Richard Yea-and-Nay by Maurice Hewlett
  3. The steel grip of Steve's hand did not relax, for a single sharp cry would mean death to him. – Steve Yeager by William MacLeod Raine