steel hardening oil

例句：

1. 1. This steel hardening oil is highly effective in enhancing the strength of steel.
   这种钢铁硬化油在增强钢材强度方面非常有效。
2. 2. The manufacturer claims that this steel hardening oil can significantly improve the durability of the products.
   制造商声称，这种钢铁硬化油可以显著提高产品的耐用性。
3. 3. In order to achieve optimal performance, it is recommended to use this steel hardening oil during the manufacturing process.
   为了获得最佳性能，建议在生产过程中使用这种钢铁硬化油。