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Fe-Ni-Co系的无碳马氏体时效钢,具有良好的热硬性、韧性和耐热性,且在工作温度范围内容积变化小,适用于压铸黄铜的模具。试验研究所用的钢种成份如表。用碱性高频感应炉熔化钢水,然后浇成10公斤重钢锭。钢锭在950°～1100℃时轧成方料(14×14mm)和棒料(φ16mm):把棒料做成计算长度为70mm(φ4mm)的试样用来测定强度和塑性;冲击韧性用标准试样进行。试验前试样先经高温强化处理,之后在500℃下时效。
Fe-Ni-Co series of carbon-free martensitic steel with good heat resistance, toughness and heat resistance, and small changes in volume within the operating temperature range, suitable for die casting brass mold. The steel used in the experimental study is shown in the table. Alkaline high frequency induction furnace melting molten steel, and then poured into 10 kg heavy ingot. The steel ingot was rolled into pellets (14 × 14 mm) and bar stock (φ16 mm) at 950 ° -100 ° C: the bars were made into specimens having a calculated length of 70 mm (φ4 mm) for strength and ductility; the impact toughness The sample is carried out. Before the test samples were first treated with high temperature, then aging at 500 ℃.