coarse pearlite

例句：

1. 1. The steel was made from a mixture of iron and carbon, with the carbon content varying according to the desired properties of the steel.
   这种钢是由铁和碳混合制成的，碳含量根据所需的钢铁性质而变化。
2. 2. Coarse pearlite is typically found in cast iron, where it provides strength and wear resistance.
   粗粒状铁素体通常存在于铸铁中，它提供了强度和耐磨性能。
3. 3. In some cases, the presence of coarse pearlite can indicate that the steel has been heat-treated to improve its mechanicalproperties.
   在某些情况下，粗粒状铁素体的发现可以表明该钢材已经经过热处理以改善其机械性能。