介绍了球墨铸铁曲轴的铸造方法、熔炼工艺和热处理工艺，同时描述了预防一般缺陷的措施。

Foundry method, melting process, heat treatment process for nodular iron crankshaft was introduced and the measures to prevent common defects were described.

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轻不合格品：有一个或一个以上一般缺陷或轻微缺陷，但不包含致命和严重缺陷的单位产品。

Slightly Unacceptable product: it refers to the unit product that has one more general or slight defects, but without fatal or severe defects.

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因此，要严格控制初始缺陷的大小使其在一般缺陷范围内，对于重要结构一定要将缺陷控制在小缺陷范围内。

Thus, the size of initial defectiveness should be controlled strictly and be made in the general range. For the important structure, the size of defectiveness must be controlled in the small range.

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