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由于我国现有轧钢设备能力有限,要满足各行业对型钢的需要,还必须由自由锻锤拔料来作一些补充。但自由锻锤上拔料、劳动强度
Due to the limited capacity of existing rolling equipment in our country, it is necessary to meet the needs of various industries for profiled steel. It must also be complemented by free forging hammer pulling. But free forging hammer on the pull material, labor intensity