简介：Traditionally,austeniticstainlesssteels304and316havebeenemployedincoastalregionsasroofingmaterialsunfortunately,theyareexpensiveandnotfullyresistanttopittingcorrosionunderseverecoastalcorrosiveenvironment.AferriticstainlesssteelB445Rwasdeveloped.Comparedwithaustenitic316L,B445Ris①lesscostly;②uperiorcorrosionresistantwithminormaintenanceforlong-termservice;③insusceptibletothermaldistortionintheweldingseam.B445Rsheetshowsahigheryieldstrengthandlowertensilestrength,lowerelongationandlowerwork-hardeningthanaustenitic316L.Itcanbeeasilyfabricatedanddeformedjustlikeplaincarbonsteel.Afterbending180o,thereisnooccurrenceof'cracking'ornoticeable'orangepeel'.Theformabilityoftheweldingseamisalsosatisfactory.ThepittingpotentialofB445Ris650mV,largerthanthatof304and316L,asshowninFig.1.ThecorrosionrateofB445Rsubmergedin6%FeCl,solutionis0.3-0.56g/(m2?h-1),muchlowerthanthatof316L,asshowninFig.2.ThesuperiorpittingcorrosionresistanceofB445RcanbeascribedtosynergeticeffectofhigherCrandMo.Dull-finishedB445RsheetshavebeenemployedastheroofingmaterialsforGuangzhouAsianGamesArena,asshowninFig.3.About380tof1.0mmB445Rwithdullfinishwasusedforroofingpanels.About100tof0.8mmB445Rwithhairlineorfluororesinpaintfinishwasusedforsidewallpanels.Thecompositeroofbuild-up（fromuptobottom）includes:①shinglesofferriticstainlesssteelB445R;②Kalzip-typestandingseamofaustenitic304;③water-proofDFM;④structuralsteel;⑤75mmthickinsulation;⑥secondarypurlinof150mm×100mm×4.5mmofgalvaniziedQ235;⑦0.8mmthickprofiledeckofgalvaniziedQ235;⑧acousticinsulation.Theroofingshinglesorpanelswiththesamewidthbutdifferentlengthwereformedbybendingfoursidesandfixedtoa'L'shapereinforcingframesofstainlesssteelbyfasteners.The'L'frameswasconnectedtoribsofthestandingseambyacl

简介：Thedull-finishferriticstainlesssteel(FSS)sheetB445RforarchitecturalroofinghasbeendevelopedbyBaosteel.ThissteelproductexhibitsexcellentcorrosionresistancesuperiortothatofSUS316Lwithalowercost.Itcanbeeasilyformedintoroofingpanelsbyordinaryprocesses.Moreover,thethermalstrainofitislessthanSUS316Lbecauseofitslowerthermalexpansioncoefficient,anditsreflectivityislowerduetothedull-finishtreatment.Allofthesefeaturesmakeitcapableofbeingusedasarchitecturalroofingmaterialsincoastalregions.

简介：在许多教科书中，对变限积分论述不多，为补充教材这一不足，对变限积分问题作了分析与研究，提出了解此类问题的方法。

简介：本文研究了矿浆pH值对浮选精矿品位、回收率、综合尾矿品位以及浮选泡沫量大小和泡沫粘度的影响。试验结果发现，pH值控制在8．7-9．0范围内，可获得铁品位相对较高的铁精矿，且回收率较高，粗尾品位低。适当提高pH值可减少泡沫量，降低泡沫粘度，有利于后续扫选流程顺行。

简介：本文在0.0016％亚硝基R盐-0.75摩尔/升氯化铵,pH=9条件下,镍于-0.42伏(VS.S.C.E.)产生吸附催化波,波形好,镍浓度在0.01～0.6微克/毫升范围内有线性关系。常见的共存离子有一定的允许量,对一些镍矿石样品的分析结果与标准值无明显偏差。

简介：Throughout30yearsofimportation,adoptionandinnovation,theColdRollingPlantofBaosteelhasadheredtoamarket-orientedstrategy,andgraduallyexpandeditsoutputandraiseditstechnicallevelthroughtheexpansionofproductionscale,theoptimizationofproductionlines,thedevelopmentofhighaddedvalueproducts,theimprovementofproductquality,environmentallyfriendlymanufacturingandtechnologicalinnovation.Inthisway,theplanthasdevelopedintoaworldclasscoldrollingplantthatproducescutting-edgeeconomicandtechnicalindices.

简介：采用金相显微镜、扫描电子显微镜对82B盘条钢拉拔断裂试样进行了分析。结果表明,钢中较多的非金属夹杂物影响材料连续性,是盘条在拉拔过程中出现断裂的主要原因。

简介：Pr2Fe14B-La2Fe14B系统被衍射(XRD)，微分扫描热量测定(DSC)和扫描电子显微镜学(SEM)与精力装备了的X光检查粉末调查散X光检查光谱学(版本)。水晶结构参数被完整侧面的Rietveld精炼决定。结果揭示了那所有合金(Pr1-xLax)2Fe14B使Nd2Fe14有空格组P42/mnm的B类型结构并且形成了连续固体在x=0.0之间的解决方案并且1.0。格子参数一，c，单位房间体积V和c/a比率与La集中线性地增加了。由thermogravimetry分析决定了，居里温度(TC),阶段转变温度和融化的温度(Pr1-xLax)2Fe14B在La内容之上线性地减少了。基于DSC大小和X光检查粉末衍射考试的结果，Pr2Fe14B-La2Fe14B系统被建立。

简介：推导了精确计算二元函数各自变量的函数增量的公式,在举例说明公式的应用与计算步骤的同时验证了公式的正确性,并叙述了如何利用计算机实现精确计算各自变量的函数增量。

简介：用本文提出的新公式进行计算时,先分别算出酸的[H~+]浓度、碱的[OH~-]浓度,再用加舍式算出整个缓冲溶液的pH值。既克服了使用最简式时,溶液稀释后所测结果与计算结果不符的缺点,又避免了精确式的繁杂计算。

简介：Baosteel's60000m3/hairseparationunit(ASU)isthelargestoxygengeneratingsysteminChina.Theoperationalcostofsuchagiantsystemisveryhigh.Howtoreducetheoperationalcostisacriticalissue.Thispaperdiscussesthesystem'scharacteristics,thecurrentoperationalstatusandthedifficultiesinreducingthecost,andanalyzesrelevantindicators,suchasthetechnicalandeconomicalindicatorsofindividualunitsandsystemsaswellastheindicatorsconcerningthecosts.Therelationshipbetweenthecostandeacheconomicalindicatorandmeasurestooptimizeaneconomicaloperationoftheoxygengeneratingsystemarealsodiscussedinthispaper.

简介：Fromtheviewofthedomesticandinternationalenergy,environmentandoperationsituation,thepaperanalysestheconfrontedproblemsofironandsteelindustry,answerswhybaosteelhasbeenfulfillingenvironmentoperationstrategy,andproceedtotheintroductionofitsenvironmentmanagementpracticeandfutureoutlooks.Theenvironmentmanagementisessentiallyagreenvaluecreation,whichemergestheenvironmentalprotectionintothewholebusinessenterpriseoperatesprocessinordertocreateitsvalue.Theenvironmentmanagementisakindofmanagementcreation,isakindofactiveenvironmentmanagement,whichpromotesthemainsenseofenergyconservationandemissionmitigation.

简介：IronmakingatBaosteelhasfocusedonblastfurnacesoverthelast30years.Afterpassingthroughthestagesof'learning','tracking','usage','experimentation','innovation'and'development',Baosteel'sproductioncapacityhasgrownsteadilyanditsstandardoftechnologyisincreasing.Remarkableprogresshasbeenmadeinthetechnologiesofblendingstack,thicklayersintering,lowsiliconandhighanhydroferritesintering,coalblending,andthehighproductivitywithhighpulverizedcoalinjection(PCI)rateandlongcampaignoftheblastfurnaces.Theentireironmakingprocessisdevelopinginthedirectionofhighefficiency,lowenergyconsumption,cleanproduction,andenvironmentalprotectionbecausethezerodischargeofsolidwasteandindustrialsewagehasbeenachieved.After20yearsofdevelopment,Baosteelhasbecomeamodernizedironproducerwithanannualcapacityof28.85Mtofsinter,7.26Mtofcokeand22.50Mtofhotmetal(PugangCorexfurnaceoutputincluded),anditsmaineconomicandtechnologicalindiceshavereachedaworld-classlevel.

简介：在符合相关标准要求、保证数据准确的前提下,为提高KQ值试验效率,通过对KQ值试验影响因素：加载频率、试样缺口尺寸、预制裂纹控制方法、应力比、应力强度因子以及裂纹长度的实验比对,发现适当调整相关因素能显著提升K_Q值试验效率。

简介：电炉厂采用100tUHP电炉短流程生产超（超）临界高压锅炉管用钢R102。通过实施精料方针、规范脱氧工艺、优化吹氩处理工艺、选择最佳二冷区配水模型、钢水低过热度浇注、控制拉速等集成的工艺，确保开发出的产品能够满足市场需求。

简介：分析了85mm厚Q345R钢板超声波探伤不合格的原因,探讨了钢板中心裂纹的形成机理,并就冶炼和轧钢工艺提出了改进措施。

简介：在pH=4.7的六次甲基四胺缓冲介质中钒(Ⅳ)与依来铬青R、CPB形成蓝紫色的三元配合物,其组成为1:3:3,λmax=590nm,表观摩尔吸光系数为4.0×104L/mol·cm,钒在0～25μg/25mL范围内遵守比耳定律,用于钢中钒的测定,结果准确可靠.

简介：张力变化直接影响到带钢轧制厚度的变化。控制张力变化是平整过程中一个非常重要的环节,在张力控制系统中,入口S辊的控制又是重点和难点,本文就入口S辊在张力控制系统中的作用及前后张力计算和调节作分析与讨论。

简介：演化计算是模拟自然界生物演化过程产生的优化策略与技术.由于它具有稳健性、通用性等优点和自组织、自适应、自学习等智能特征,已广泛应用于许多领域.本文简要介绍了演化计算的基本思想、算法框架,并以一个具体的函数为例给出了实现过程和结果,分析了程序的执行效率、存在的问题和解决方案.

简介：分析证明了温度和时间对SWRH77B盘条性能的影响。选择一组人工时效的试验条件，进行人工与自然时效方法的对比试验，通过试验验证了可以通过选定条件下的人工时效试验来代替自然时效试验。