wwwcnkinet含硼生铁冶炼硼钢新工艺及其硼钢性能研究

181Vol.18No.12018-11-29．“863”2006AA03Z529．1959—[e-mail]．20193JournalofMaterialsandMetallurgyMarch2019doi10.14186/j.cnki.1671－6620.2019.01.005110819wB2O3≥12%．、S、PB0.0005%～0.0035%、20Mn2、15MnVB40MnB、45MnBGB/T3077－1999．TF76A1671-6620201901-0025-06Novelboronsteelsmeltingtechnologyusingboron－containingpigironandthepropertiesofboronsteelYangZhongdongLiuQiLiuSulanSchoolofMetallurgyNortheasternUniversityShenyang110004ChinaAbstractBoron－containingpigironisanimportantby－productformedbyextractingboronfromboron－richslagwB2O3≥12%throughblastfurnacemethod．AnewBsteelsmeltingtechnologyemployingboron－containingpigironasthestartingmaterialswasstudiedandthemechanicalpropertiesoftheBsteelwereinvestigated．TheresultsshowedthatbothSandPimpuritycontentsintheBsteelcouldmeettheboronsteelstandard．Theboroncontentcouldbecontrolledinarangeof0.0005%～0.0035%whichisthestandardrequirementoftheboronsteel．Thetensilestrengthimpacttoughnessandothermechanicalpropertiesoftheboronsteelareallsuperiortothoseof20Mn215MnVBandbalancedwiththoseof40MnBand45MnBalloysteel．TheobtainedBsteelcangetthesimilarcompositionsinnationalstandardGB/T3077－1999bycontrolingtheotheralloycomponents．Keywordsboron－containingpigironPre－desulfurationandpre－desiliconizationboron－containingsemisteelboronsteelmechanicalproperty10.1%～0.5%2．3－6．．、GB/T3077－1999．1100m3%B0.1～0.5Si2.0～2.5C3.3～3.8S0.06～0.1Mn～0.12P～0.065wSiwS3、7．、50kW20kg8Φ2mm．CMT5105Instron9250HVdroptowerinstrumentSEM、、XＲD．22.12.1.111350～1400℃．0.01%．1Table1Ｒesultsofpre－desulfurizationfortheboroncontainingpigironkg·t－1HMwSO/%wSF/%mink/s－1×1030.1%Al－100.0980.010182.20CaC280.0960.005152.7940%+60%80.100.010182.2660%+40%40.100.00583.65229/%C3.2～3.4、Si0.2～0.5、B0.02～0.06、Mn0.07～0.09、P0.06～0.065、S＜0.01．2Table2Ｒesultsofdesilicationtreatmentfortheboroncontainingpigironafterdesulfurizationmassfraction%CSiBMnPS13.260.170.0160.0780.0620.00823.380.420.0620.080.060.0133.320.230.0380.0820.0650.00843.420.460.1020.0880.0650.00753.250.220.0320.0760.060.00963.20.120.0140.0720.0640.00873.350.380.0410.080.0620.00683.180.260.0280.0840.060.00793.300.400.030.0820.0650.0072.1.2、．、Fe2O3CaF2Fe2O341～31CaF23%～5%CaO%/SiO2%Ｒ=37．1、、、、1580℃0.002%0.0005%～0.0035%0.019%．XＲDB2O3．10B2O3V2O3SiO2SiO2B2O3．6218369121518210.090.080.070.060.050.040.030.020.0103.532.521.510.500.300.250.200.150.100.050t/minw(Si)/%w(C)/%w(B),w(Mn),w(P),w(S)/%MnPCSiBS1Fig.1VariationofcompositioninmoltensteelcontainingBduringsmelting2.2GB/T3077－1999、．36－27A．3Table3Compositionofboronsteelspecimensmassfraction%BSiCMnPS7－2A0.00330.7050.191.700.0200.0106－27A0.00510.3510.271.860.0230.008A900℃30min→880℃30min→200℃120min2.2.1243～4．－．411．4Table4Testtensilepropertiesofboronsteelspecimensσb/MPaσ0.2/MPaδ5/%Ψk/%7－2A104077014.8263.366－27A11508158.4537.091200100080060040020000.010.020.030.040.05Stress/MPaStrain7-2A-1#1200100080060040020000.0050.0150.0250.0350.010.020.03Stress/MPaStrain6-27A-1#2－Fig.2Tensilestress－straincurveofboronsteelspecimen2.2.2351.5．、．5Table5Testresultsofabsorbed－in－fractureenergyofboronsteelspecimensAkv2/JAkv2/J7－2A88.078.86－27A22.211.67－220Mn2、15MnVB40MnB、45MnB．20Mn240MnB、45MnB20MnVB、20MnMoB．7210123490705030103020100/kNt/msE/Jt/ms231915117300.91.00.80.70.60.50.40.30.20.120100/kNE/J7-2A-1#6-27A-1#39250HVFig.3Impacttestresultsofboronsteelspecimenwith9250HVdroptower3、．4、5．7－2A6－27A．．Fe23CB612．66－27AXＲDFe23CB676－27AFe23CB612．wB＞0.0035%5μm5μm7-2A6-27A4SEMFig.4SEMmicrographsoftensilefractureofboronsteelspecimens82185μm5μm7-2A6-27A5SEM10μm5μmFig.5SEMmicrographsofimpactfractureofboronsteelspecimens13．6－27A．807060504030902θ/(°)35003000250020001500CPS■—Fe▲—Fe23CB660.0051%6－27AXＲDFig.6XＲDpatternofboronsteelspecimenof0.005%boroncontent50μm6-27A50μm7-2A7Fig.7Characteristicofboridephaseinboronsteelspecimensunderopticalmicroscope41、．20.0005%～0.0035%、．3、．1ZhangXPLiuSLCuiCM．PreparationofpigironcontainingbornfromludwigiteC∥11thInter．Symp．onBornBorides＆ＲelatedCompouTsukubaJpnAug．22－261993．2YangZDLiZFXueXX．OxidationofsiliconandboroninboroncontainingmoltenironJ．JournalofIronandSteelＲesearchInternaional200714632－36．3．J．CAMP－ISIJ2002153489．MHonda．InfluenceofboronontoughnessofquenchedsteelwithvariouscarboncontentsJ．CAMP－ISIJ2001141361．4LahaKKyonoJKishimotoSetal．Beneficialeffectof921bsegregationoncreepcavitationinatype347austeniticstainlesssteelJ．Scr．Mater．2005527675－678．5PajuMHougardyHPGrabkeHJ．Effectsofboronalloyingonheropertiesofalow－alloyedsteelJ．Scand．J．Metall．1989185235－242．6DuanGSChenWQSunB．ImpacttoughnessintheweldingheataffectedzoneofHSLAsteelwithboronJ．JournalofUniversityofScienceandTechnologyBeijing2009318995－1000．7YangZD．ExperimentalStudyondirectlysmeltingboronsteelwithpigironcontainingboronD．ShenyangNortheasternUniversityDecember2008．8．M．2004．ZhaoPeiChengGuoguangShensu．ThefinesmeltingandthepretreatmenttechnologymanualM．BeijingTheMetallurgicalIndustryPress2004．9YangZDLiuSLXueXX．OxidationrulesofsiliconandboroninmoltenironunderoxygenblowingJ．JournalofMaterialsandMetallurgy200762102－104．10．M．．2013352．HuangXihu．PrinciplesofironandsteelmetallurgyM．Fourthedition．Beiji