台车用QT500—7A铸态球墨铸铁生产中成分及打箱时间的控制.pdfVIP

学兔兔 铸 造 Sep．2011 · 914· FOUNDRY VOI．60 NO．9 台车用QT500—7A铸态球墨铸铁生产中成分 及打箱时间的控制 滕志远，孙立军 (鞍钢重型机械责任有限公司冶炼设备制造厂，辽宁鞍山114000) 摘要：采用中频感应电炉熔炼，选取鞍山本地生铁、重稀土球化剂和钡硅铁孕育剂等原材料，生产出铸态铁素体和珠光 体混合基体的球墨铸铁。生产实践及试验表明，在给定工艺条件下，材质成分及打箱时间的控制，对铸态下稳定地获得 球铁的期望组织和性能至关重要。打箱时间控制在16～21h的条件下，可以有效控制伸长率在7％～12％范围内，以适量Cu 进行合金化，可有效控制球铁珠光体比例。同时，还给出了台车铸态球铁生产中相应的具体成分、球化和孕育工艺。 关键词：QT500．7A；化学成分；伸长率；打箱时间 中图分类号：TG143．5 文献标识码：B 文章编号：1001—4977(201 1)09—0914—03 Control of Chem ical Com position and Shakeout Time in Production of As--Cast QT500—-7A Ductile I ron for Trolley TENG Zhi—yuan，SUN Li-jun (Angang Heavy Machinery Responsibility Co．，Ltd．，Smelting Equipment Plant， Anshanl 14000，Liaoning，China) Abstract：The medium—frequency induction furnace was employed to produce the ductile cast Iron， whose matrix is the mixture of fetrite and pearlite．The IocaI pig iron fr0m Anshan was used as raw material。and heavy rare earth as nodulizer and ferrosilicon barium as inoculant．The production practice and tests show that under the given condition．the controI of chemicaJ composition and shakeout time is of cruciaIimpo~ance for obtaining the expected microstructure and mechanicaI prope~y in as-cast state．If the shakeout time is between 1 6．21 h．the elongation can be controlled In the range of 7％ -1 2％ ．Alloying by adding adequate Cu element can controI the volume percentage of pearlite in duclile cast iron．1n this paper，the specific chemical composition，