48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines.It mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making cran...48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines.It mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making crankshaft of heavy duty truck engines.BX STEEL made trial production by means of converter→secondary metallurgy(RH+LF)→rectangular slab caster→hot rolling process,and studied the T[O],T[N],[H]and non-metal inclusion in 48MnV-C steel under continuous casting process condition,the actual grain size and the slab quality.All the chemical compositions and test results met the needs of Cummings Crankshaft Steel Standard.In order to ensure the mechanical properties of the non-heat treatment steel,a certain amount of nitrogen is added to it,also a small amount of sulfur is added to improve the cutting property of the steel.This process route can make full use of the de-hydrogen function of RH,and during RH treatment,rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn,as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen,low hydrogen,low oxygen content in 48MnV-C steel.Magnetic marks are defects shown in magnetic powder testing after the steel was used to make finished crankshafts.The 48MnV-C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety,but also high qualification rate and basically no"magnetic marks"are found after being made into finished crankshafts,which meets the crankshaft standard.Therefore,this steel has been widely used in domestic crankshaft industry.展开更多
我国工业发展水平与经济增长速度存在直接关联,及时掌握高能耗工业工厂空间分布和运营情况的客观数据,对国家经济增长和产业结构改革具有重要意义。本文基于高时空分辨率的375 m的NPP-VIIRS主动热异常数据(NPP-VIIRS active fire/hotpot...我国工业发展水平与经济增长速度存在直接关联,及时掌握高能耗工业工厂空间分布和运营情况的客观数据,对国家经济增长和产业结构改革具有重要意义。本文基于高时空分辨率的375 m的NPP-VIIRS主动热异常数据(NPP-VIIRS active fire/hotpot data),结合矢量数据密度分割算法,叠加POI数据和高分辨率遥感数据,形成2012年-2020年京津冀区域在营工业热源产品数据集(包含类别信息)。本数据集提供了工业热源数据的四角经纬度、类别代号、所属行政区、起止运行年份等信息。本数据可为产业改革成果和未来改革方向提供数据支撑。展开更多
文摘48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines.It mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making crankshaft of heavy duty truck engines.BX STEEL made trial production by means of converter→secondary metallurgy(RH+LF)→rectangular slab caster→hot rolling process,and studied the T[O],T[N],[H]and non-metal inclusion in 48MnV-C steel under continuous casting process condition,the actual grain size and the slab quality.All the chemical compositions and test results met the needs of Cummings Crankshaft Steel Standard.In order to ensure the mechanical properties of the non-heat treatment steel,a certain amount of nitrogen is added to it,also a small amount of sulfur is added to improve the cutting property of the steel.This process route can make full use of the de-hydrogen function of RH,and during RH treatment,rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn,as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen,low hydrogen,low oxygen content in 48MnV-C steel.Magnetic marks are defects shown in magnetic powder testing after the steel was used to make finished crankshafts.The 48MnV-C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety,but also high qualification rate and basically no"magnetic marks"are found after being made into finished crankshafts,which meets the crankshaft standard.Therefore,this steel has been widely used in domestic crankshaft industry.
文摘我国工业发展水平与经济增长速度存在直接关联,及时掌握高能耗工业工厂空间分布和运营情况的客观数据,对国家经济增长和产业结构改革具有重要意义。本文基于高时空分辨率的375 m的NPP-VIIRS主动热异常数据(NPP-VIIRS active fire/hotpot data),结合矢量数据密度分割算法,叠加POI数据和高分辨率遥感数据,形成2012年-2020年京津冀区域在营工业热源产品数据集(包含类别信息)。本数据集提供了工业热源数据的四角经纬度、类别代号、所属行政区、起止运行年份等信息。本数据可为产业改革成果和未来改革方向提供数据支撑。
