The press formability of high-purity ferritic stainless steel sheets was examined by a multi-stage cylindrical deep drawing test. The effects of mechanical properties on deep drawability and the characteristics of press forming techniques were studied. The results are summarized as follows: (1) The high-purity ferritic stainless steels can be arranged in order of decreasing deep drawability as follows: boron-added YUS 436S > boronfree YUS 436S, YUS 190 > SUS 304 SUS 430. The addition of boron is especially effective in preventing the cold work embrittlement of excessively formed parts. (2) For the mechanical property evaluation factors, the r value showed a relatively good correlation with the deep drawability. The other factors, or elongation, the n value, the Erichsen value and conical cup value, showed no clear-cut correlation with the deep drawability. (3) It is important that any multi-stage cylindrical deep drawing process should be designed to ensure metal flow from the flange to the center of the cylinder. The redrawing ratio of 0.86 produced good results for the high-purity ferritic stainless steels.
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机译：高纯度铁素体不锈钢板的冲压成形性通过多阶段圆柱深冲试验进行了检验。研究了机械性能对深冲性和压制成型技术特性的影响。结果总结如下：（1）可以按照降低深冲性的顺序排列高纯铁素体不锈钢，如下所示：添加硼的YUS 436S>无硼YUS 436S，YUS 190> SUS 304 SUS 430。硼的添加对防止过度成型零件的冷加工脆化特别有效。 （2）对于力学性能评估因素，r值与深冲性具有较好的相关性。伸长率，n值，埃里克森（Erichsen）值和锥形杯值是其他因素，与深冲性没有明显关系。 （3）重要的是，应设计任何多阶段的圆柱体深冲工艺，以确保金属从法兰流向圆柱体中心。 0.86的再拉伸比对于高纯度铁素体不锈钢产生了良好的结果。
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