| 摘要 |
<p>The steel has improved toughness and wear resistance as a result of the addition of 0.01 to 1.00% by weight of niobium. A first embodiment comprises 0.70 to 0.90% by weight of C; 0.80 to 1.10% by weight of Mn; 0.15 to 0.30% by weight of Si; 0.025% (maximum) by weight of P; 0.015% (maximum) by weight of S; 0.40 to 0.60% by weight of Cr, and, in this invention, including from 0.01 to 1.00% by weight of Nb and a second embodiment, comprises 0.70 to 0.90% by weight of C; 1.30 to 2.00% by weight of Mn; 0.15 to 0.30% by weight of Si; 0.025% (maximum) by weight of P; 0.015% (maximum) by weight of S, and, in this invention, 0.01 to 1.00% by weight of Nb.</p> |
