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black cored malleable cast iron
met.
黑心可锻铸铁
(【技】在非氧化气氛中进行可锻化退火,使铸件中渗碳体发生分解,形成絮状石墨,其断口心部呈暗黑色,周边脱碳呈灰白色,黑心可锻铸铁由此得名。)
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