Furan resin sand is poor in collapsibility when it is used for al alloy casting, specially for some large, thinsectioncastings.
呋喃树脂砂用于铝合金铸造时，特别是对于一些大型、薄壁铝合金铸件，型芯的溃散性较差。
2
Therefore, in thinsectioncastings, for eliminating eutectic carbides and obtaining ferritic matrix, melts treated by re need high carbon content and hypereutectic composition.
在薄壁铸件中获得无游离渗碳体和铁素体基体的稀土球铁的关键是高碳过共晶原铁水。
3
According to the requirements of automobile exhaust pipes on material and its properties, a high strength and toughness nodular cast iron of thinsectioncastings has been developed.