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55SiMoVA钢是耐冲击工具钢,经热处理后具有高的强度(σ_b≥238公斤力/毫米~2)和屈服强度(σ_(0·2)≥196公斤力/毫米~2),高的硬度和耐磨性,高的疲劳强度和冲击韧性以及优良的工艺性能。特别是冲击韧性和滚珠压碎负荷比GCr15钢大大提高:冲击韧性提高5倍左右,滚珠压碎负荷提高60％左右。通过二万多个钻头的现场使用试验证明,牙轮钻头滚动体用55SiMoVA钢比GCr15钢的钻头寿命提高0.5～1倍,而且大大地改善牙轮钻头滚动体的失效形式。该钢含Si、Mo元素较多,在热处理过程中易脱碳,因此在热加工过程中要注意防止钢材表面脱碳。这种钢适用于制造牙轮钻头滚动体,还可制造耐冲击工具。可以进行化学热处理,如渗碳或碳氮共渗等,以提高其耐磨性能。
55SiMoVA steel is an impact-resistant tool steel with high strength (σ_b ≥ 238 kgf / mm 2) and yield strength (σ 0 (2.2) ≥ 196 kgf / mm 2 after heat treatment), high hardness and Wear resistance, high fatigue strength and impact toughness and excellent process performance. In particular, the impact toughness and ball crushing load are much higher than that of GCr15 steel: the impact toughness is increased by about 5 times and the ball crush load is increased by about 60%. Field tests with more than 20,000 drill bits have shown that the life of 55SiMoVA steel for the roller bit rolling body is increased by 0.5 to 1 time compared to that of the GCr15 steel and the failure mode of the roller bit rolling body is greatly improved. The steel containing Si, Mo more elements, easy decarburization in the heat treatment process, so in the hot working process should pay attention to prevent decarburization of the steel surface. This steel is suitable for making roller bit rolling elements and also for making impact-resistant tools. Can be chemical heat treatment, such as carburizing or carbonitriding, etc., in order to improve its wear resistance.