在机器制造业所应用的各种钢材中(尤其是国产钢材),我们往往发现有很多缺陷,影响着机件的质量并造成很多的废品;对於这些问题,我们必须瞭解了钢材在冶炼、锻造、压延过程中造成这些缺陷的原因和它对机械性质的影响后,才能有适当的处理。所以这个介绍一些在实际工作所常遇到的钢 In the various types of steel used in machine manufacturing industry (especially domestic steel), we often find that there are many defects that affect the quality of the machine parts and cause a lot of waste; for these problems, we must understand the steel smelting, Forging, rolling process caused by these defects and its impact on the mechanical properties, can be properly handled. So this introduces some of the steel that’s often encountered in real work