taotieyi
铸铁造句_用铸铁造句大全(5-300个句子) - 造句网(在线造句词典)
2013年6月15日 ... 蠕墨铸铁除含有C、Si、Mn.S、p等元素外，还含有少童稀土蠕化剂，但其稀土含量比 球墨铸铁低，故焊接接头形成白口的倾向比球墨铸铁的小、比灰铸铁大，力学 ... 用中 性焰焊接，焊件焊前预热650℃，焊后所得焊缝蠕化率达60%-70%, ...
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