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大连钢厂过去生产的碳素弹簧钢丝,机械性能均匀性差,大尺寸钢丝靱性较低,达不到标准的要求,造成大量
Dalian Steel past the production of carbon spring steel wire, poor mechanical properties, large-size steel wire is low, less than the standard requirements, resulting in a large number