简介：Lightweightdesignisoneofthedevelopmenttrendsoftheautomobileindustry.AneffectivewaytoachievelightweightautobodiesistouseAHSS(advancedhighstrengthsteel)forthesafetycomponentsofautomobiles.ThisstudyhastakendoorsillreinforcementsmadeofmartensiteAHSSastheobject,andperformedresearchontheAHSSrollformingtechnologiesandprototypedevelopmentoftypicalasymmetricopencomponents.Bymeansoffiniteelementanalysis(FEA)andsimulation,studieshavebeencarriedoutonthespringbackandedgewavedefectsduringAHSSrollforming,andanoptimizedprocessdesignhasbeenachieved.Thegenerationmechanismsofverticalbows,horizontalcambers,twists,pre-punchedholedistortionandcutendflarehavebeenanalyzed,andsolutionstothesedefectshavebeengiven.Inaddition,tesingoftherollformingprocessforAHSShasbeenconductedandtypicalsampleswithrequireddimensionalaccuracyhavebeenmanufactured.Thisstudyhasprovidedtechnicalsupportforthelarge-scaleapplicationofAHSS.

简介：Toaddressthephenomenonofsparkingduringtheedgeinductionheatingprocessinhotstripmills,thispaperusesnumericalsimulationtosystematicallyinvestigatethekeyfactorsinfluencingsparkingandtheireffects.Thedistributionofinducedcurrentdensityinthesteelplateaboverollerconveyortableduringtheheatingprocessiscalculatedandcomparedunderdifferentconditions,includingtherelativepositionsofthesteelplateandinductioncoil,thewidthofthesteelplate,andchangesinload.Theresultsshowthatwhenanarrowsteelplateisheatedorthesteelplateshiftstothesideoftheinductioncoil,sparkingbetweenthesteelplateandrollerconveyorismorelikelytooccur.

简介：Thisarticleistrytoexplainoranalyzethekeytechnologiesofcontrollingthesurfacequalityoflowcarbonsteelascaststripthroughinvestigationofinterfaceheattransferbetweensolidifiedshellandliquidsteel.Theoneofthekeytechnologiesofcontrollingsurfacequalityoflowcarbonsteelascaststripisthroughthecastingrollsurfacetextureinordertoachievethehomogeneoussolidificationonthecastingroll.Anotheristhroughformingathinfilmonthecastingrollsurfaceinordertoachieveabalancebetweenrapidsolidificationandhomogeneoussolidification.Thisfilmformedbetweenthetwinrollandthemoltensteelcanbecontrolledbyadjustingthechemicalcompositionandinclusioninliquidsteelthroughcontrollingtheamountofall[O]andfree[O].

简介：Chinaisanimportantcountryinironandsteelindustry.Powerelectronicsconvertersarewidelyused.Forthecoldrollingmillsofhighspeed,AC-DC-ACconvertersshouldbeused.Inthepaper,thedesignandthecontrolsystemofthelargepowerthree-levelAC-DC-ACconverterwithIGCTsisinvestigated,andaback-to-backlargepowerthree-levelAC-DC-ACconverterwithIGCTshasbeengot.Withaseriesexperiments,theperformanceoftheconverterisexamined.Theexperimentresultindicatestheconverterreachesthedesignrequirementanditshowsexcellentperformance.Theconvertersystemhasbeenputintousesafely.ItisestimatedthattheAC-DC-ACconvertersystemwillbeusedinthedrivesystemsforrollingmillsinthenearfuture.

简介：应用金相显微镜对Q345q钢板的表面裂纹进行了检测分析。结果表明:表面裂纹有星状裂纹、微裂纹和发状裂纹3种;裂纹由板面向内延伸,内嵌有氧化亚铁,附近及尾端存在明显的高温氧化特征;裂纹附近和远离裂纹区域组织均为铁素体+珠光体,且裂纹附近有明显的脱碳特征。

简介：应用相机、金相显微镜和扫描电镜对Q345q热轧态钢板表面疤状缺陷进行检测分析。结果表明:疤状缺陷为非金属夹杂(渣),其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,并在钢板表面形成凹坑。

简介：通过Q370qEN桥梁板生产中遇到的一些问题，从坯料成分选择、轧制成形和热处理工艺等角度出发，结合各阶段组织、性能变化，尤其是组织对钢板低温冲击韧性影响方面，进行分析和探讨。结果表明，组织的均匀性是保证低温韧性的关键因素，并且对今后生产工艺改进提出了几点看法。

简介：介绍了屈服强度420MPa级别高性能耐候桥梁钢的研制、现场生产及钢板实物性能。所开发的Q420qENH耐候桥梁钢板具有高耐候、高强度、高韧性、低屈强比等优异的综合性能,能够满足藏木大桥建设对高性能桥梁钢的需求。

简介：利用碳纤维片高强和可粘贴的性能,把碳纤维片用环氧树脂粘贴在被补强的混凝土结构表面,有效封闭了混凝土裂缝,并与原混凝土结构形成一体共同承受荷载,使混凝土结构得到了有效的加固补强.

简介：介绍了屈服强度345、370和420MPa级别高性能耐候桥梁钢的成分设计、现场试制及钢板实物性能。所开发的系列高性能耐候桥梁钢具有高强度、高韧性、低屈强比、高抗低温断裂性性能及高耐候等综合性能,能够满足未来桥梁建设对高性能桥梁钢的需求。