,,, % ( ) Table1 Chemicalcompositionof11%Crslab % C Si Mn P S Ni Cr Cu Al Ti N O

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1 11% 1 2, (1. ( ), ; 2. ( ), ) 11%, 11% 11%, Al2O3, O Al Ti 11% ; ; ; A (2015) Mechanismonnozzleblockageofultrapurified 11%Crferriticstainlesssteels LIYan 1, LIJu-cang 2 (1.TechnologyCenter,JiuquanIronandSteel(Group)Co.,Ltd.,Jiayuguan735100,Gansu,China; 2.HongxingIronandSteelCo.,Ltd.,JiuquanIronandSteel(Group)Co.,Ltd.,Jiayuguan735100,Gansu,China) AbstractCombined withactualproduction data,the mechanism on nozzleblockageduringcontinuouscasting processofultrapurified11%crferritestainlesssteels(11%crup-fss)wasinvestigatedbymetalurgicalobserva- tionandenergyspectrumanalysisaswelasthethermodynamiccalculationfortitaniumandaluminumoxidesforma- tion.theresultshowedthatnozzleblockageof11%crup-fsswasmainlycausedbythehighti-oxidescontentin moltensteel.duringthecastingprocess,thecompoundoxidesgeneratedfromthereactionbetweenti-oxidesand Al2O3innozzlerefractoryadheredtothenozzlewal,enrichedcontinuouslyandadsorbedotherinclusionsandmol- tensteel,whichcanmakethenozzlewalthicker.nozzleblockageof11%crup-fsscanbeefectivelyprevented throughcontrolingtheo,al,ticontentsinsteel,usingdeepdeoxidizationduringsmeltingprocess,increasingthe softblowingtimeandholdingtime,preventingthesecondaryoxidationandcastinginhigherdegreeofsuperheat. Keywordsnozzleblockage;compoundoxides;softblowing;holding;superheat,,, 10%~14% ;,,,, [1-5],, 1,,, 11% AOD LF [6-8] CCM AOD 11%,, LF, (1964 ),,, ; liyan@jiugang.com; (1969 ),,, ; lijucang@163.com

2 ,,, % ( ) Table1 Chemicalcompositionof11%Crslab % C Si Mn P S Ni Cr Cu Al Ti N O e (K) B (1873K) Table2 Interactioncoeficientsofelementsin 2 liquidiron,e (K) B (1873K) % 2.1 Al C Cr N O Si Ti Ti Al , O , (5) ( 1, 1873K), ; (a) ( ); (b) ; (c) ( ) Fig.1 1 Metalographicobservationforscafold-formingmaterial, ; (1) 11% 2, (2) 3 11%,,, Ca-Ti, (3) 4,, ( 15 mm ) LF,,, Ti-Al (, 5 2); Mg-Al-Ti-Ca 5 ( 3); 0.01%,, ( 4) 0.01% Al 2O 3, LF 0.005%,

3 第１１期李岩等超纯１１铬铁素体不锈钢水口结瘤机理水口结瘤实物照片ｂ水口结瘤物外层电镜微观形貌图１点能谱图ｄ２点能谱图图２靠近水口结瘤物分析Ｆ２ＥｎｕｍｎｓｓｓｄｍｎｇｍｎｈＳＥＭｇｇｙｓｐｙ水口结瘤物中部电镜微观形貌图ｂ１点能谱图２点能谱图ｄ３点能谱图图３结瘤物中部分析Ｆ３Ｅｎｕｍｎｓｓｈｍｄｄｐｓｄｍｎｇｍｇｇｙｓｐｙ４７

4 (a) ; (b)1 ; (c)2 ; (d)3 4 Fig.4 Energyspectrumanalysisfortheinteriorofscafold-formingmaterial (a) ; (b) ; (c) 5 Fig.5 Statisticsforprocesofproduction 2.3, Al 2O 3,, Al 2O 3 11%,, Al 2O 3 Ti 2O 3,Al 2O 3 TiO 2,, [3] 1500~1550,,Al 2O 3, TiO 2, 1860, ;AOD LF Al 2O 3 (s)+tio 2 (s)= Al 2O 3 TiO 2 (s) ΔrG θ m1= t (1), ; ΔrG θ m1,j/mol;t,k AOD, 2.1.2,, 20min,

5 40min,,, [9], 2[Al]+3[O]=Al 2O 3 11% 0.01%, 0.01%, 0.009%, ( ),,kj/mol;t,k;k ΔrG θ m4= T (7) ;α B ;fb B 2 (7) fti=4.22, ;e B ;w fo=0.21,% (1555 ), 11% (2)~ (5) 1 2 fal=0.96 (1555 ), 11% w Ti w O2 = w 2 Ti wo3 = w Al 2 wo3 = , [10-15] 0.01%,, % Ti 2O 3 ΔrG θ m2= T (2) TiO 2 ΔrG m= ΔrG θ m2+ RTlnK θ (3) [9] TiO 2 Ti 2O 3 αb =fbw B (4) [Ti]+2[O]= TiO 2 lgfb =e (B) B w B +e (3) B w 3 + +e (K) B w K (5) ΔrG θ m3= T (6) ΔrG m,kj/mol;δrg m2 2[Ti]+3[O]= Ti 2O 3 11% 1 2, 11% 7 (1592 LF,1555,1505 ), 6 7 Fig.7 StablitydiagramofTiOXinsteel 6 Al2O3 Fig.6 StablitydiagramofAl2O3insteel (1)Ti 2O 3 TiO 2 6, (2),,, LF, 11%, (3) 0.2%, LF

6 Ti 2O %,TiO % 1 LF (4)LF, Al 2O 3 [15] Ti 2O 3 TiO 2 (5)LF 20min, 40min, Ti 2O 3 TiO (6),LF, 3 8 Ti2O3 Fig.8 StablitydiagramofTi2O3 9 TiO2 Fig.9 StablitydiagramofTiO2 (1) 11% Al 2O 3 (2) 11% Ti 2O 3 TiO 2, (3) w C+w N, , (4),,, 0.01%,0.009%, (5)LF,,, (6) 20min, 40min, 50,, (4),,, [J]., [4].,2008,116(6)26. (1),,AOD, (5)1541. (2), w C+w N, w C+w N, w C+w N (3), 50 [1],,,.409L,2011,46(6)40. [2],,,.409L 430 [J].,2011,33(4)28. [3],.409L 410L [J].,2008(8) [J]. [5] KrawiecH,VignalV.Dissolutionofchromium-enriched inclusionsandpitingcorrosionofresulfurizedstainlesssteels [J].Metal Mat Trans APhys Metal MatSci,2006,37 [6],,, [J].,2004,26(6)596. [7],,,. [J].,2005,17(1)14.

7 [8],,. inspinelsolidsolutionandfreeenergiesofformationofmgo, [J].,2010(5)1. MgO Al2O3[J].ISIJInternational,2000,40(11)1059. [9]. [M].,2005. [13],,,.409L [10],,,. [J].,2010,31(6)848. [J].,2008,29(1)16. [11] NishiT,ShinmeK.Formationofspinelinclusionin molten stainlesssteelunderaldeoxidation withslag[j].tetsu-to- Hagane,1998,84(12)837. [12] FujiK,NagasakaT,Hino M.Activitiesoftheconstituents [14],,.BOF-LF-CSP SPHC [J].,2013,25(3)23. [15],,. [J].,2013,35(9)1138.

前言本指南是 CCS 规范的组成部分, 规定船舶入级产品, 授权法定产品检验适用技术要求, 检验和试验要求本指南由 CCS 编写和更新, 通过网页发布, 使

前言本指南是 CCS 规范的组成部分, 规定船舶入级产品, 授权法定产品检验适用技术要求, 检验和试验要求本指南由 CCS 编写和更新, 通过网页发布, 使指南编号 /Guideline No.W-02(201510) W-02 轧制不锈钢钢板生效日期 /Issued date:2015 年 10 月 20 日中国船级社 China Classification Society 前言本指南是 CCS 规范的组成部分, 规定船舶入级产品, 授权法定产品检验适用技