The abnormal structure usually appears at the surface layer of nodular iron castings produced by furan-sulfonic acid cured sand mold.
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- 本实验研究查明,当用甲苯磺酸作催化剂的呋喃树脂自硬砂生产稀土镁球铁件时,通常在其铸件表层出现异常组织。