Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1.6% to 2.45% ,which is significantly higher than other types of steel. Accor...Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1.6% to 2.45% ,which is significantly higher than other types of steel. According to the real condition of 40 t ladle in steel-making plant of Baosteel Special Steel Company, previous works show that the key factors affecting the ladle free-opening rate of high aluminum steel in continuous casting are：sand material, accessories baking, ladle nozzle cleaning, the process and amount of adding sand, and the rate of argon stirring during refining. Therefore, improving the ladle filler sand quality, baking all of the raw materials, controlling the addition of ladle filler sand, cleaning the ladle nozzle, and optimizing argon stirring during the refining process can resolve the problem of a low ladle free-opening rate of high aluminum steel caused by the long ladle time of liquid steel.展开更多
To overcome the problems in design methodologies and construction control measures for the large open caisson, systematic research was conducted on the side friction calculation mode of the large open caisson. Based o...To overcome the problems in design methodologies and construction control measures for the large open caisson, systematic research was conducted on the side friction calculation mode of the large open caisson. Based on the field monitoring data of lateral soil pressure on the side wall of the open caisson for the southern anchorage of the Maanshan Yangtze River Highway Bridge, the statistical result of the side friction under different buried depths of the cutting edge of the open caisson was back-analyzed; and the side friction distribution of the large open caisson was underlined. The analysis results indicate that when the buried depth of the cutting edge is smaller than a certain depth H0, the side friction linearly increases with the increase in the buffed depth. However, as the buffed depth of the cutting edge is larger than H0, the side friction shows a distribution with small at both ends and large in the middle. The top of the distribution can be regarded as a linear curve, while the bottom as a hyperbolic curve. As the buffed depth of cutting edge increases continuously, the peak value of the side friction linearly increases and the location of the peak value gradually moves down. Based on the aforementioned conclusions, a revised calculation mode of the large open caisson is presented. Then, the calculated results are compared with the field monitoring data, which verifies the feasibility of the proposed revised calculation mode.展开更多
The article focuses on the influence of operator and process safety and the trends of robotics and digitalisation on a ladle slide gate that was introduced to the market 6 years ago[1].After more than 50 installations...The article focuses on the influence of operator and process safety and the trends of robotics and digitalisation on a ladle slide gate that was introduced to the market 6 years ago[1].After more than 50 installations,customer experience was gathered and new features were added to a system upgrade.These upgrades are related to safety,ease of operation,and low operational costs.Especially a newly introduced“open check”feature increases the confidence level of the operators and can boost performance.With growing requirements to increase safety for people and processes in the ladle preparation area and on the continuous casting floor,automation has become increasingly important in steel plants.A slide gate prototype is currently underway to launch an innovative new gate design striving for full automation.Several critical process steps are already available and successfully used in the steel plants,such as cylinder connection,slag detection integration,and ladle gate preparation area automation.Fully automated operation will be followed by digitalisation,allowing for tracking of performance,safety,and quality.This paper summarises new features available for slide gates and outlines individual initiatives towards fully automated operation and data acquisition examples of digitalisation.展开更多
文摘Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1.6% to 2.45% ,which is significantly higher than other types of steel. According to the real condition of 40 t ladle in steel-making plant of Baosteel Special Steel Company, previous works show that the key factors affecting the ladle free-opening rate of high aluminum steel in continuous casting are：sand material, accessories baking, ladle nozzle cleaning, the process and amount of adding sand, and the rate of argon stirring during refining. Therefore, improving the ladle filler sand quality, baking all of the raw materials, controlling the addition of ladle filler sand, cleaning the ladle nozzle, and optimizing argon stirring during the refining process can resolve the problem of a low ladle free-opening rate of high aluminum steel caused by the long ladle time of liquid steel.
基金Project supported by China Communications Construction Company Limited(No.2008-ZJKJ-11)
文摘To overcome the problems in design methodologies and construction control measures for the large open caisson, systematic research was conducted on the side friction calculation mode of the large open caisson. Based on the field monitoring data of lateral soil pressure on the side wall of the open caisson for the southern anchorage of the Maanshan Yangtze River Highway Bridge, the statistical result of the side friction under different buried depths of the cutting edge of the open caisson was back-analyzed; and the side friction distribution of the large open caisson was underlined. The analysis results indicate that when the buried depth of the cutting edge is smaller than a certain depth H0, the side friction linearly increases with the increase in the buffed depth. However, as the buffed depth of the cutting edge is larger than H0, the side friction shows a distribution with small at both ends and large in the middle. The top of the distribution can be regarded as a linear curve, while the bottom as a hyperbolic curve. As the buffed depth of cutting edge increases continuously, the peak value of the side friction linearly increases and the location of the peak value gradually moves down. Based on the aforementioned conclusions, a revised calculation mode of the large open caisson is presented. Then, the calculated results are compared with the field monitoring data, which verifies the feasibility of the proposed revised calculation mode.
文摘The article focuses on the influence of operator and process safety and the trends of robotics and digitalisation on a ladle slide gate that was introduced to the market 6 years ago[1].After more than 50 installations,customer experience was gathered and new features were added to a system upgrade.These upgrades are related to safety,ease of operation,and low operational costs.Especially a newly introduced“open check”feature increases the confidence level of the operators and can boost performance.With growing requirements to increase safety for people and processes in the ladle preparation area and on the continuous casting floor,automation has become increasingly important in steel plants.A slide gate prototype is currently underway to launch an innovative new gate design striving for full automation.Several critical process steps are already available and successfully used in the steel plants,such as cylinder connection,slag detection integration,and ladle gate preparation area automation.Fully automated operation will be followed by digitalisation,allowing for tracking of performance,safety,and quality.This paper summarises new features available for slide gates and outlines individual initiatives towards fully automated operation and data acquisition examples of digitalisation.
