齿轮钢中非金属夹杂物控制技术研究

第30卷第3期2009年7月

钢铁钒钛

IRONSTEELVANADIUM

TITAMUM

V01.30,No.3July2009

齿轮钢中非金属夹杂物控制技术研究

赵克文1”,王新华1,李海波1,王

郢1,陈天明2

(1.北京科技大学冶金与生态学院,北京100083;2.攀枝花钢铁(集团)公司,四川攀枝花617067)

摘要:为了降低钢的T[O]含量和生成较低熔点的非金属夹杂物以改善合金结构钢的抗疲劳破坏性能,在炉外精炼中采用了高碱度和高舢:O,含量的渣系。研究发现LF和RH精炼结束时钢液T[O]含量均随炉渣碱度增加而降

低,在炉渣仙O,含量低于25%时,T[O]随炉渣m:03含量减少而降低,而当炉渣AI:O,超过25%后,T[0]则随炉

渣AI:O,含量增加而降低。精炼过程钢液中夹杂物按“AI:03系夹杂物一MgO—A120,系夹杂物一cao—MgO一舢:03系夹杂物”顺序发生转变,其中M90.AI:O,系夹杂物向CaO-Mso-A1:03系夹杂物的转变是由外向内逐步进行的,转变速度相对较慢,因而致使LF结束时钢中仍存在许多尚未转变的Mgo-AI:O,系夹杂物。钢液T[O]对夹杂物转变

有显著影响,降低T[O]含量有利于生成较低熔点的CaO Mso-AI:03系夹杂物。

关键词:合金结构钢;炉外精炼;炉渣;非金属夹杂物;熔点中图分类号:TGl42.4

文献标识码:A

文章编号:1004—7638(2009)03—0038—06

ChangeoftheNon-metallicInclusionsduringtheSecondaryRefining

ofLowOxygenAlloyedStructuralSteels

ZhaoKewenl”,WangXinhual,LiHaib01,WangYin91,ChenTianmin92

(1.SchoolofMetallurgicalandEcologicalEngineering,University

of

ScienceandTechnologyBeijing,Beijing100083,

China;2.PanzhihuaIronandSteelCorporation,Panzhihua617067,Sichuan,China)

Abstract:SlagofhighbasicityandhishA1203contentwasusedinsecondaryrefiningofMloyedstructur-alsteelsaimingatdecreasingtotaloxygen

contents(T[0])ofsteelandformingrelativelylowermelting

pointinclusionstoimprovetheanti.fatiguepropertiesofthesteels.ItwasfoundthatT[0]at

theendof

LFandRHrefiningbothdecreasedwiththeincreaseofslagbasicity.WhenA1203intheslagWaslessthan

was

25%,T[O]decreased

morethan

withthedecreaseofA1203contentof

sk.While,when

A1203intheslag

25%,T[0]decreasedwiththeincreaseofA1203contentofslag.Intherefining,compo—

sitionsofthenon—metallicinclusionschangedinorderof“inclusionsofA1203_inclusionsofMgO—A1203

system_+inclusionsofCaO—MgO—A1203system”,amongwhich,thechangeofinclusionsofMgO-A1203systemtoWasinwardlyfromoutsidesurfaceandthereactionspeedWasrelativelyslower.Thus,attheendoftheladlefurnaceThesing

refining(LF),there

were

stillmanyunchangedMgO A1203systeminclusions.

T[O]contentT[O]content

ofthesteelssignificantlyaffectsthecompositionchangeoftheinclusionsanddecrea’couldhelpobtaininclusionsofCaO—MgO-A1203systemwithlowmeltingpoint.

Keywords:alloyedstructuralsteel;secondaryrefining;slag;non—metallicinclusions;meltingpoint

收稿日期:2008—12—22

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