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| expand ratio (【技】表示管坯直径与毛坯直径之间的关系。毛管直径的增长率根据扩径率数值的不同分为：扩径穿孔、等径穿孔、减径穿孔。生产厚壁管时，扩径率为负值；生产薄壁管时，扩径率为正值。在生产中最好使用等径穿孔。) | |||
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扩径率 : 2 phrases in 2 subjects |
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