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分析了塑料模具标准件顶杆的工作条件和性能要求，研究了顶杆整体淬火用钢６５ＭｎＶ的热处理工艺、组织和力学、工艺性能，并与目前国内常用顶杆用钢进行了比较，同时探讨了６５ＭｎＶ钢的强韧化机制。研究结果表明，６５ＭｎＶ钢有较高的力学性能和良好的工艺性能，强度可达σ０．２＝２０５７．４ＭＰａ，σｂ＝２３４２．７ＭＰａ，冲击韧性ａＫ＝１０．４４Ｊ／ｃｍ２，淬火硬度在ＨＲＣ６２以上，是理想的顶杆整体淬火用钢。
The working conditions and performance requirements of standard mandrel of plastic mold were analyzed. The heat treatment process, microstructure and mechanical properties and process performance of 65MnV steel for mandrock whole quenching were studied and compared with the commonly used mandrel steel in China. 65MnV steel toughening mechanism. The results show that 65MnV steel has high mechanical properties and good process performance, strength up to σ0.2 = 2057.4MPa, σb = 2342.7MPa, impact toughness aK = 10.44J / cm2, quenching hardness above HRC62 , Is the ideal overall quenching mandrel steel.