A kind of high strength and High Toughness Nodular Cast Iron and manufacturing method thereof, belonging to the technical field of casting, which is composed of the following formula: C 3.8%, Si 2.7%, Mn is less than or equal to 0.35%, P = 0.05%, S = 0.03%, Mg = 0.035%, RE = 0.02%, the rest of the molten iron and impurities. The invention has the advantages of novel component, the production process is reasonable and clear, the tensile strength is not less than 600MPa at more than 10%, the tensile strength and yield strength than conventional inoculation increased 30%, elongation increased by about 45%, the hardness is increased by about 15%, without normalizing or annealing can be cast with high strength and high toughness nodular cast iron. Save the cost of heat treatment. It can replace the cast steel parts with complex shape and hot joint, which not only improves the production rate, but also does not need heat treatment, which greatly reduces the production cost.
【技术实现步骤摘要】
一种高强度高韧性球磨铸铁及其制作方法
本专利技术属于铸造
,涉及一种球磨铸铁,特别是涉及一种高强度高韧性球磨铸铁及其制作方法。
技术介绍
铸铁主要由铁、碳和硅组成的合金的总称。铸铁可分为:灰口铸铁、白口铸铁、可锻铸铁、球磨铸铁、蠕墨铸铁以及合金铸铁。球墨铸铁是通过球化和孕育处理得到球状石墨,其有效地提高了铸铁的机械性能,特别是提高了塑性和韧性,从而得到比碳钢还高的强度。球墨铸铁是20世纪五十年代发展起来的一种高强度铸铁材料,其综合性能接近于钢,正是基于其优异的性能,已成功地用于铸造一些受力复杂,强度、韧性、耐磨性要求较高的零件。球墨铸铁已迅速发展为仅次于灰铸铁的、应用十分广泛的铸铁材料。从球磨铸铁的国家标准中可以看出:随着抗拉强度的升高,伸长率下降的很快,抗拉强度大于600MPa以上时,需进行正火热处理才能获得且伸长率依然很低。
技术实现思路
本专利技术为了解决传统球磨铸铁件随着抗拉强度升高,伸长率下降较快等不足,提供一种高强度高韧性球磨铸铁及其制作方法,在不增加额外的加工工序以及加工成本的条件下,获得较高的强度和韧性,能满足高要求场合的使用。本专利技术的技术方 ...
【技术保护点】
一种高强度高韧性球磨铸铁,其特征在于:由如下质量百分比的原料组成,C 3.8%、Si 2.7%、Mn≤0.35%、P≤0.05%、S≤0.03%、Mg≤0.035%、RE ≤0.02%、其余为铁水和杂质。
【技术特征摘要】
1.一种高强度高韧性球磨铸铁,其特征在于:由如下质量百分比的原料组成,C3.8%、Si2.7%、Mn≤0.35%、P≤0.05%、S≤0.03%、Mg≤0.035%、RE≤0.02%、其余为铁水和杂质。2.如权利要求1所述的一种高强度高韧性球磨铸铁的制作方法,其特征在于,包括如下制作步骤:(1)选用500kg中频电炉进行熔炼,采用纯净的低碳钢并通过含碳量为90%的增碳剂进行增碳来制作原铁水...
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