产品质量是我国机械工业赶超国际先进水平要抓的主要矛盾,包括铸造在内的基础工艺又是矛盾的主要方面。本文全面介绍了日本铸锻钢株式会社铸造的300吨转炉耳轴(其主动侧耳轴净重96吨)的质量情况,铸造工艺概要以及超声波探伤检验的方法与标准,读者可从中找到借鉴,也可找出我国铸造业与国际先进水平的差距。 Product quality is China’s machinery industry catch up with the international advanced level to grasp the main contradictions, including the foundry, including the basic process is the main contradiction. This article provides an overview of the quality of castings forged 300-ton converter trunnion (its active side trunnion net weight of 96 tons), casting process summary and methods and standards of ultrasonic flaw detection, which readers can learn from, or Find out the gap between China’s foundry industry and the international advanced level.