| 摘要 |
Road-working cutters are made of a steel containing 0.2- 0.4% of carbon, 1.0-2.0% of silicon, 0.8-2.0% of manganese and 0.5-1.5% of chromium, the rest being composed of iron and impurities. The cutters obtained from this steel have a good notch-bar impact strength, combined with a good tempering resistance. Due to this last quality, the resistance to wear is not greatly reduced by local hot spots formed in the cutting edge due to friction when used on a hard road surface. The cutters can be hardened by quenching in oil, which produces a fine-grained structure of so-called rib martensite when the cutters have a thickness of 9-14 mm. |
