Keywords As-cast ferritic ductile iron threaded pipe fitting rough castings;Duplex melting;Porous plug process desulphurizing;Lnverse chill;Carbon flotation;
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美
- 铸态铁素体球铁螺纹管件;双联熔炼;多孔塞法脱硫;反白口;石墨漂浮;