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提出了制作热推弯管机芯棒的新型铸钢成分设计原则。研究了这种钢的回人稳定性及热疲劳性能，并进行了生产应用。
The design principle of a new type of steel castings for making hot-pushed pipe mandrel is proposed. The return stability and thermal fatigue properties of this kind of steel were studied and the production application was carried out.