鋼包電磁攪拌生產(chǎn)潔凈鋼的幾個(gè)工藝?yán)碚搯?wèn)題

1、鋼包電磁攪拌生產(chǎn)潔凈鋼的幾個(gè)工藝?yán)碚搯?wèn)題鋼包電磁攪拌生產(chǎn)潔凈鋼的幾個(gè)工藝?yán)碚搯?wèn)題高海潮朱倫才顏根發(fā)摘要90tLFVD(EMS)鋼包精煉爐的試驗(yàn)表明:“鋼渣混卷”能顯著提高ηs但使η0急劇下降甚至出現(xiàn)負(fù)值。因此在對(duì)鋼液進(jìn)行脫硫時(shí)應(yīng)使I＞I卷、臨而對(duì)鋼液進(jìn)行凈化攪拌時(shí)應(yīng)使I＜I卷、臨。攪拌過(guò)程中使鋼液裸露不僅提高其收得率，也利于快速真空脫氣。但在非真空狀態(tài)下鋼液的氮含量與“開(kāi)眼”面積大小負(fù)相關(guān)。電磁攪拌在排除鋼液非金屬夾雜物方面有其他攪拌根

2、本無(wú)法替代的獨(dú)特功能可加快夾雜物的上浮速度電磁場(chǎng)能對(duì)導(dǎo)電流體(鋼液)中的不導(dǎo)電物質(zhì)(非金屬夾雜物)產(chǎn)生擠壓力而使其分離這一功能對(duì)生產(chǎn)潔凈鋼有著十分重要的意義。關(guān)鍵詞關(guān)鍵詞鋼包電磁攪拌潔凈鋼生產(chǎn)工藝?yán)碚揚(yáng)ROBLEMSPROBLEMSABOUTABOUTPROCESSPROCESSTHEYTHEYININPRODUCTIONPRODUCTIONOFOFCLEANCLEANSTEELSTEELBYBYELECTROMAGICELECTROM

3、AGICSTIRRINGSTIRRINGININLADLELADLEGaoHaichaoZhuLuncai(MaanshanIron&SteelCo.Ltd.)YanGenfa(MaanshanJingyingScience&TechnologyCo.Ltd.)SynopsisSynopsisTestingresultsintheLFVD(EMD)ladlefurnaceshowthatvalueη0fallsdowndrastical

4、lyeventoanegativevaluealthoughηsrisesprominentlybywayof“Liquidsteelsteelslagblending“.TherefeintheperiodofdesulphurizingtheliquidsteelI＞IcoilshouldbemainfainedbutinstirringtheliquidsteelI＜Icoilbemaintained.Exposureofthel

5、iquidsteelintheprocessofstirringcannotonlyraisethemetalyieldbutalsoacceleratevacuumdegassing.Howeverinnonvacuumstate［N］contentisininverseproptiontothe“opening“area.Ineliminationofnonmetalinclusionstheelectromagicstirring

6、hasauniquefunctionwhichcanneverbereplacedbyanyotherstirringmethod.Itcanacceleratetherisingspeedoftheinclusions.Theelectromagicfieldcanbringaboutapressuretothenonconductivesubstance(nonmetalinclusion)causetheirsegregation

7、.Thisfunctionisofveryimptantsignificancetotheproductionofcleansteel.KeywdsKeywdselectromagicstirringinladleproductionofcleansteelprocessthey圖1電攪電流強(qiáng)度與鋼中全氧量的關(guān)系3.33.3電磁攪拌時(shí)間與鋼中全氧含量的關(guān)系電磁攪拌時(shí)間與鋼中全氧含量的關(guān)系在鋼包頂渣厚度110mm和電磁攪拌強(qiáng)度固定不變的情

8、況下鋼中全氧含量與上攪拌的時(shí)間關(guān)系見(jiàn)圖2。從圖可見(jiàn)隨電攪時(shí)間增加鋼中全氧是不斷下降的。圖2電攪時(shí)間與TO的關(guān)系3.43.4渣層厚度及吹氬量與臨界渣層厚度及吹氬量與臨界“開(kāi)眼開(kāi)眼”電流強(qiáng)度的關(guān)系電流強(qiáng)度的關(guān)系分別測(cè)試了不吹氬、底吹氬50lmin和底吹氬100lmin的3種情況下不同渣層厚度與上攪臨界“開(kāi)眼”電流強(qiáng)度關(guān)系(見(jiàn)圖3)。渣層越厚I開(kāi)、臨越大底吹氬強(qiáng)度越大I開(kāi)、臨越小。當(dāng)渣層厚度為110mm在不同吹氬量情況下I開(kāi)、臨可以用下式計(jì)算