the forty years of vermicular graphite cast ,ron development in china（part ⅱ）

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1、Thefortyyearsofvermiculargraphitecast,rondevelopmentinChina（PartⅡ）August2007GpecialReviewhefortyyearsofvermiculargraphitecastirondevelopmentinChina(Par-tⅡ).Q!Uhan-quanjand卿Zheng-de2I-臼.ShandongmsU~teofmechanicaldesignandresearch;2anghaiofficeofUKVanrageCoOCICnumbers:T

2、G143.5/一1DocumentCode:A2.1ManufacturingmethodsFromthelongperiodofpracticalexperiencesofVGCIproduction,thefollowingfourpointsareveryimportantforthesuccessfulproductionofVGCI:●Consistentlycontrolsulphuratthecorrect,lowlevel(consistencyisthekeypoint);●Chooseasuitableverm

3、iculariser;●Accuratelycontroltheweightofliquidmetaltobetreated;●Controltheironmelttemperaturetoobtainaconsistenttreatmenttemperature;Ifanyoftheaboveoperationsareignored,thenqualityfluctuationswilloccur.TheproductionofVGCIneedsevenmorestrictcongolthanthatofSGironandifi

4、tiswellcontrolled.stableproductionofVGCIcanbeobtaineddirectlyfromcupolaandblastfumaceiron.ThishasbeenconfirmedbyseveralVGCImanu~cturers.QIUHan—quanetahavestudiedthecontrolsystemforVGCIproduction,whichenabledtheimprovementofVGCIproduction.Severalmethodshavebeenusedfort

5、heproductionofVGCIinChina.2.1.1SprinklingvermicularisingalloyintheironstreamatthespoutInthismethod.RE—FeSiorRE—Ca.FeSialloyissprinkledintotheironstreamatthespoutofthecupolaorelectricfurnace.Aftermixingwithtreatmentalloy,theironistransferredintotheladle,themoltenironis

6、stirred;slagisremoved,andthenpoured.ThiswasanearlyusedmethodinChinaandisstillbeenused.Thismethodissuitableformediumorheavysectioncastingst5,28,3,4qPENGTi—yuaneta51describedamethodinwhichanintermediatevesselisusedbetweenthespoutandthepouringladle(thisisknownasthedouble

7、vesselswirlingmethod).ArticleID:1672—.6421(2007)03??175—.07Treatmentalloyiswellmixedwithmoltenironbeforeenteringapouringladle.Adoubleswirlingmethoddescribedinreference[46】issimilartotheintermediatevesselmethod.2.1.2Dam.ladletreatmentTherearethreevariationsofthismethod

8、.(1)"Stirringbylowboilingpointalloy":RE—FeSi(orRE_Ca—FeSialloy)andRE—Mgalloyareplacedinsidethedaminthebottomoftheladle,eithe