含铝冷镦钢生产工艺分析与质量控制

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1、第1I页武汉科技大学硕士论文ABSTRACTAseriesofhighqualityaluminumkilledcoldheadingsteelcoilandrodsfromgradeXSWRCH6AtoXSWRCH35Ahavebeendevelopedbyhotmentalpretreatment--topandbottomcombinedblownconverter—billetcasting—二billettest．jIlighspeed、历re—Irodmillprocess，usingthewireswhichcontai

2、nbariumtodeoxidizeandchangeinclusions’properties．Strictlycontrollingproductiontechnologyfromconvertersmelting,LFrefiningandcontinuouscastingtorollingtoellsurequalifiedchemicalcompositionsofS，只Als，T．o'inclusioncontent,themetallurgicalstructuresunderhotrollingstateareform

3、edbyferritewithcrystalgrain8～8．5grade，alittleofgranularpearliteandbainte．Reasonscausingahigherunqualifiedratioofcoldheadingwirerodareanalyzedinthispaper．Theresultshowsthatthebreakismainlyduetohighyieldstrengthofwirerod，unevenmicrostructures，fineferritegrainsinternallyan

4、dwidmanstattemferriteappearingatedges．Based011theresearchwork，correspondingmeasuresareputforwardandcarriedout．Everyclassesofaluminumkilledcoldheadingsteelshaveexcellentmechanicalproperties．Thequalifiedrateby1／3coldheadingtestreaches98．6％，andby1／4coldheadingtestreaches97

5、．7％．Keywords：aluminumkilledcoldheadingsteel：complexdeoxidizer：qualitycontrol；refiningprocess2．1湘钢含铝冷镦钢产品品种⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．82．2含铝冷镦钢生产工艺及主要设备特点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．8。．2．2．1生产工艺流程⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯82．2．2生产工艺特点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．82．2．3主要设备特点⋯⋯⋯⋯⋯⋯

6、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯9第三章影响含铝冷镦钢开裂的原因分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ll3．1SWRCH22A冷镦钢盘条的化学成分及其影响⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯：⋯⋯⋯⋯．113．2SWRCH22A冷镦钢盘条的试验与分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯123．2．1第一次冷顶锻试验⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯123．2．2第二次冷顶锻试验⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．133．2．3第三次冷顶锻试验⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．143．3SW

7、RCH22A冷镦钢盘条夹杂物的初步研究⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．173．3．1夹杂物的形状与分布⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯173．3．2夹杂物的成分与种类⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．173．3．3夹杂物的变形行为⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．183．4结论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．18第四章用含钡合金对冷镦钢脱氧⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯194．1试验材料及方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯194．2试验结果及分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯204．2．1全氧含量的变化情况⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯20第Ⅳ页武汉