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攀登与奉献: 淸华大学科技五十年 - Google Books Result
2017年8月9日 ... 球墨铸铁与铸铁、铸钢的区别介绍. ... 灰口铸铁.含碳量较高（2.7％～4.0％）,碳主要以 片状石墨形态存在,断口呈灰色,简称灰铁. ... ⑤蠕墨铸铁.将灰口 ...
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