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p22厚壁合金管产品展示-350vip葡亰集团
URL description:
p22 厚壁合金管 生产一般主要变形工序有三个：穿孔、轧管和定减径，其各自的工艺目的和要求如下。穿孔是将实心的管坯穿制成空心的毛管，(1)要穿出的毛管壁厚均匀，椭圆度小，几
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