oxygen blown steel

例句：

1. 1. The steel is so hard that it can't be easily worked with by ordinary tools.
   这种钢太硬了，普通工具难以加工。
2. 2. The steel was made using a special process to enhance its strength and toughness.
   这种钢是通过一种特殊的工艺制造的，以增强其强度和韧性。
3. 3. The steel industry relies heavily on the availability of oxygen for its production processes.
   钢铁工业严重依赖氧气供应，用于其生产过程。