The process of cooling is called quench. special improved patented steel wire
这种冷却过程叫做淬硬。特号铅淬火冷拉钢丝
This article introduces the application of lead liquid covering flux to the production of patented steel wire, this flux was made in Tianjin a certain Co.
介绍天津某公司生产的铅液覆盖剂在钢丝铅淬火生产中的应用情况。
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