This study explores the unique role of CO_(2)as an oxidant in stainless steel smelting,focusing on its effectiveness in decarbonization and chromium retention.The research begins by theoretically demonstrating that al...This study explores the unique role of CO_(2)as an oxidant in stainless steel smelting,focusing on its effectiveness in decarbonization and chromium retention.The research begins by theoretically demonstrating that although the introduction of CO_(2)increases the CO partial pressure in the reaction system,the decarburization and chromium(Cr)retention capabilities of CO_(2)can still be stably maintained through the rational adjustment of the molten steel composition,temperature,and inert gas proportions.Further experimental findings indicate that chromium does not exhibit significant oxidation losses when the carbon(C)content exceeds 1.0%(mass).Finally,a novel CO_(2)recovery and utilization approach is proposed,integrating CO_(2)capture from smelting flue gas and recycling it for smelting,reducing O_(2)consumption and energy costs.This innovative process,compatible with existing smelting plants,presents a promising pathway towards carbon neutrality in the iron and steel industry,bridging theoretical insights with practical applications.展开更多
Excellent Heat Affected Zone Toughness Technology Improved by use of Strong Deoxidizers(ETISD Technology)has been developed by Baosteel.When deoxidation of molten steel is conducted at the precisely controlled oxygen ...Excellent Heat Affected Zone Toughness Technology Improved by use of Strong Deoxidizers(ETISD Technology)has been developed by Baosteel.When deoxidation of molten steel is conducted at the precisely controlled oxygen concentrations,the formation of the micro-meter inclusions and the nano-meter precipitates in the steel plate can be effectively controlled.During the welding process with high-heat input,the formation of acicular ferrite can be selectively promoted with the aid of micro-meter inclusions;the growth ofγgrain can also be selectively restrained by the pinning effect of nano-meter precipitates.After welding with high-heat input of 400 kJ/cm,excellent heat affected zone toughness can be obtained for the steel plates with both of the above microstructures,and the average absorbed energy is greater than 200 J for V notch Charpy impact test at-20℃.展开更多
In order to meet the requirement of semi-steel making,the original nozzle was optimized by Vanadium-recoverying and Stee1-making Works of Pangang.And then every parameters of the oxygen lance were assessed according t...In order to meet the requirement of semi-steel making,the original nozzle was optimized by Vanadium-recoverying and Stee1-making Works of Pangang.And then every parameters of the oxygen lance were assessed according to industrial tests.Results show that,comparing with the original oxygen lance nozzle the new designed one has a better metallurgical effect,the average volume of oxygen and oxygen supply intensity were increased by 774m3/h and 0.19 m3/(t·min)respectively,oxygen consumption was reduced by 1.87m3/t,the blowing time was lowered by 56 seconds,a better dephosphorization effect was obtained by the new one.展开更多
基金supported by the Postdoctoral Fellowship Program of CPSF(GZC20230017)the Natural Science Research Project of Anhui Educational Committee(2024AH050153)+1 种基金the National Natural Science Foundation of China(52322407,52274313)the China Postdoctoral Science Foundation(2024M750013).
文摘This study explores the unique role of CO_(2)as an oxidant in stainless steel smelting,focusing on its effectiveness in decarbonization and chromium retention.The research begins by theoretically demonstrating that although the introduction of CO_(2)increases the CO partial pressure in the reaction system,the decarburization and chromium(Cr)retention capabilities of CO_(2)can still be stably maintained through the rational adjustment of the molten steel composition,temperature,and inert gas proportions.Further experimental findings indicate that chromium does not exhibit significant oxidation losses when the carbon(C)content exceeds 1.0%(mass).Finally,a novel CO_(2)recovery and utilization approach is proposed,integrating CO_(2)capture from smelting flue gas and recycling it for smelting,reducing O_(2)consumption and energy costs.This innovative process,compatible with existing smelting plants,presents a promising pathway towards carbon neutrality in the iron and steel industry,bridging theoretical insights with practical applications.
文摘Excellent Heat Affected Zone Toughness Technology Improved by use of Strong Deoxidizers(ETISD Technology)has been developed by Baosteel.When deoxidation of molten steel is conducted at the precisely controlled oxygen concentrations,the formation of the micro-meter inclusions and the nano-meter precipitates in the steel plate can be effectively controlled.During the welding process with high-heat input,the formation of acicular ferrite can be selectively promoted with the aid of micro-meter inclusions;the growth ofγgrain can also be selectively restrained by the pinning effect of nano-meter precipitates.After welding with high-heat input of 400 kJ/cm,excellent heat affected zone toughness can be obtained for the steel plates with both of the above microstructures,and the average absorbed energy is greater than 200 J for V notch Charpy impact test at-20℃.
文摘In order to meet the requirement of semi-steel making,the original nozzle was optimized by Vanadium-recoverying and Stee1-making Works of Pangang.And then every parameters of the oxygen lance were assessed according to industrial tests.Results show that,comparing with the original oxygen lance nozzle the new designed one has a better metallurgical effect,the average volume of oxygen and oxygen supply intensity were increased by 774m3/h and 0.19 m3/(t·min)respectively,oxygen consumption was reduced by 1.87m3/t,the blowing time was lowered by 56 seconds,a better dephosphorization effect was obtained by the new one.
