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1. 发明授权

US4889687A Nodular cast iron having a high impact strength and process of treating the same 失效
标题翻译：具有高冲击强度的球墨铸铁及其处理方法
公开(公告)号：US4889687A
公开(公告)日：1989-12-26
申请号：US165873
申请日：1988-03-09
申请人： Yasuoki Ishihara , Fumio Obato , Jun Sakai , Takeshi Natsume
发明人： Yasuoki Ishihara , Fumio Obato , Jun Sakai , Takeshi Natsume
IPC分类号： C22C37/04
CPC分类号： C22C37/04
摘要： Nodular cast iron having favorable mechanical properties, in particular a high impact strength at low temperatures, comprising: from 3.0 to 4.0% of carbon; from 1.5 to 2.3% of silicon; less than 0.3% of manganese; not more than 0.03% of phosphorus; less than 0.10% of chromium; from 0.02 to 0.06% of magnesium; and from 0.0015 to 0.0150 weight % of bismuth with the balance consisting of iron and inevitable impurities and the CE (carbon equivalent) value being from 3.9 to 4.6%. This material is characterized by a low silicon content. Adding from 0.5 to 2.0% of nickel thereto improves its tensile strength and yield strength. Preferably, from 0.005 to 0.03% of bismuth is added to this nodular cast iron in molten state so as to produce more than 300 graphite nodules per mm.sup.2. The remaining bismuth content is preferably from 0.0015 to 0.015%, more preferably from 0.0015 to 0.004%. The resulting nodular cast iron has improved mechanical properties, in particular a high low temperature impact strength and can be used either as cast or after a ferritizing process.
摘要翻译：球状铸铁具有良好的机械性能，特别是在低温下的高冲击强度，包括：3.0〜4.0％的碳; 1.5〜2.3％的硅; 小于0.3％的锰; 不超过0.03％的磷; 小于0.10％的铬; 0.02〜0.06％的镁; 和0.0015〜0.0150重量％的铋，余量由铁和不可避免的杂质组成，CE（碳当量）值为3.9〜4.6％。该材料的特征在于硅含量低。添加0.5〜2.0％的镍可以提高拉伸强度和屈服强度。优选地，在熔融状态下向该球墨铸铁中加入0.005〜0.03％的铋，以便每mm 2产生多于300个石墨结核。剩余的铋含量优选为0.0015〜0.015％，更优选为0.0015〜0.004％。所得到的球墨铸铁具有改善的机械性能，特别是高的低温冲击强度，并且可以用于铸造或在铁素体化过程之后使用。

2. 发明授权

US4619713A Method of producing nodular graphite cast iron 失效
标题翻译：生产球墨铸铁的方法
公开(公告)号：US4619713A
公开(公告)日：1986-10-28
申请号：US538821
申请日：1983-10-05
申请人： Makoto Suenaga , Mitsuru Yano , Yasuoki Ishihara , Kohki Ohtsuka
发明人： Makoto Suenaga , Mitsuru Yano , Yasuoki Ishihara , Kohki Ohtsuka
IPC分类号： C21D5/00
CPC分类号： C21D5/00
摘要： A method of producing a nodular graphite cast iron having high strength and toughness in shorter time and with reduced production cost. The method comprises the following steps: rapidly cooling the casting, which has been removed from the mold at a predetermined temperature above the A.sub.1 transformation point, at such a cooling rate as not to permit the generation of pearlite structure, after having been held for a predetermined time within the austenite temperature range or immediately after having been removed from the mold; once stopping the rapid cooling at a temperature above the Ms point; slowly cooling the casting within a temperature range above the Ms point for a predetermined time or holding the casting at a constant temperature within a predetermined temperature range above the Ms point for a predetermined time; and cooling the casting slowly down to the normal temperature.
摘要翻译：一种在较短时间内制造具有高强度和韧性的球墨铸铁并降低生产成本的方法。该方法包括以下步骤：以高于A1相变点的预定温度从铸模中除去的铸件以不允许产生珠光体组织的冷却速度在被保持为在奥氏体温度范围内或刚刚从模具中取出之后的预定时间; 一旦在Ms点以上的温度下停止快速冷却; 在高于Ms点的温度范围内缓慢冷却铸件预定时间，或将铸件保持在高于Ms点的预定温度范围内一段预定时间的恒温下; 并将铸件缓慢冷却至常温。

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