The method made the X-ray beam harden at first, and then the kinds of prehardening materials and correction rule of beam hardening artifacts were obtained through experiment.

该方法对X射线进行一定程度的预硬化，通过实验获得预硬化材料种类及射束硬化伪像的校正规律。

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The new domestic - developed plastic mould steels include prehardening steel . age hardening steel, quenching-tempering steel, cold -forming steel, and anti - corrosion steel, etc.

国产新型塑料模具钢主要有预硬钢、时效硬化钢、淬火——回火钢、冷挤压成型模具钢、耐蚀钢等类型。

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