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灰铸铁铸件硬度偏低的影响因素
Influence Factors of Low Hardness of Gray Iron Castings
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- DOI:
- 作者:
- 刘德旺 姜建柱
LIU Dewang;JIANG Jianzhu
- 作者单位:
- 陕西法士特汽车传动集团有限责任公司铸造分公司
Foundry Branch,Shaaxi Fast Auto Drive Group Co.,Ltd.,Baoji 722409,China
- 关键词:
- 硬度 合金化处理 微量元素 孕育 开箱时间
hardness alloying microelement inoculation opening time
- 摘要:
- 结合铸造生产实践,从灰铸铁配料,合金化及控制开箱时间3个方面入手,依据金相组织及铸件本体硬度检测结果,分析了造成灰铸铁件批量硬度偏低形成的主要原因。通过采用调整炉料配比,用碳化硅进行铁液预处理以及用锡铁进行合金化处理等工艺措施,有效改善了铸件金相组织,提高了灰铸铁件硬度。结果表明,灰铸铁配料中使用20%~50%的回炉料、部分含有铬元素的废钢,并使铸件锡含量调整至0.04%~0.06%,能稳定生产出合格硬度的灰铸铁件,提高了铸件品质。Based on the practice of casting,the test results of metallographic structure and body hardness of cast iron were obtained from the three aspects of ingredients,alloying and controlling the time of opening sand mould,the main reasons of low batch hardness of gray cast iron were analyzed.The microstructure and hardness of gray cast iron were improved by adjusting ingredients ratio,treating molten iron with silicon carbide and alloying with tin iron.The results show that 20%~50%of the return ingredients and some scrap steel containing chromium elements are used in the gray cast iron,and the tin content of the casting is adjusted to 0.04%~0.06%,which can produce qualified gray cast iron with stable hardness and improve the casting quality.