In this paper,the recent state and problems of the sink roll in CGL are described.Several methods of increasing its operational life span are introduced,such as surface coating technology and sleeve material technolog...In this paper,the recent state and problems of the sink roll in CGL are described.Several methods of increasing its operational life span are introduced,such as surface coating technology and sleeve material technology.Fundamentally they cannot solve the problems of surface quality caused by the contact between strip and roll.On this basis,the newly developed principle and solutions for hot dip galvanizing technology without sink roll are highly emphasized,they are Float Technology,Electromagnetic pump technology,Electromagnetic enclosed slot by high-frequency AC,Electromagnetic enclosed slot by high-frequency DC.A comparison among their functions and characteristics is made and the possibility of its application is also discussed.Finally it comes to a conclusion that electromagnetic enclosed slot represents the direction of a continuous hot-dip galvanizing steel strip in the the 21st century.It has a very broad application prospects.Baosteel Technology Center is focused on the research and development of this technology.As technology advances,industrial applications is possible.展开更多
The relationships of activities with 1% solute as standard state and mass fraction of solute, and hot dip temperature, were given on the base of Miedema’s model, Tanaka expression, some basic thermodynamic relationsh...The relationships of activities with 1% solute as standard state and mass fraction of solute, and hot dip temperature, were given on the base of Miedema’s model, Tanaka expression, some basic thermodynamic relationships; and discussion was carried out on Zn Mn and Zn Ti binary alloys by calculation, in which varied colors can be achieved onthe hot dip steel sheets. The results indicate that the activity of solute shows positive deviation relative to Henry’s law for both Zn Mn and Zn Ti binary dilute solution. The degree of deviation increases with increasing solute and decreases with increasing bath temperature. As the solution is very dilute solution ( w (Mn)≤40% for Zn Mn alloy, w (Ti)≤8% for Zn Ti alloy), the two binary baths can all be treated as ideal dilute solutions. [展开更多
The surface treatment technology can improve the corrosion resistance of steel sheets and increase the value of steel application.The surface treated steel sheets in Baosteel include zinc galvanized steel sheets,sin g...The surface treatment technology can improve the corrosion resistance of steel sheets and increase the value of steel application.The surface treated steel sheets in Baosteel include zinc galvanized steel sheets,sin galvanized steel sheets,chromium galvanized steel sheets,and colour coating steel sheets with the application in the area from construction to automobiles,appliance,package,etc.The development,application and manufacturing technique of these products have become the core competition power of Baosteel. The article reviews the developments of surface treated steel sheets and surface treatment technologies in Baosteel in 10 years,especially hot dip galvanized high strength steel products used in vehicles.The article also looks forward into further developments of surface treatment steel products and technologies in Baosteel,which will focus on:①the new products of hot dip galvanized advanced high strength steels;②more environmental friendly products or functional coating products;③the development of surface treatment technologies to meet the requirement of higher surface quality in the marcket;④new type of surface treatment and coating technologies.展开更多
文摘In this paper,the recent state and problems of the sink roll in CGL are described.Several methods of increasing its operational life span are introduced,such as surface coating technology and sleeve material technology.Fundamentally they cannot solve the problems of surface quality caused by the contact between strip and roll.On this basis,the newly developed principle and solutions for hot dip galvanizing technology without sink roll are highly emphasized,they are Float Technology,Electromagnetic pump technology,Electromagnetic enclosed slot by high-frequency AC,Electromagnetic enclosed slot by high-frequency DC.A comparison among their functions and characteristics is made and the possibility of its application is also discussed.Finally it comes to a conclusion that electromagnetic enclosed slot represents the direction of a continuous hot-dip galvanizing steel strip in the the 21st century.It has a very broad application prospects.Baosteel Technology Center is focused on the research and development of this technology.As technology advances,industrial applications is possible.
文摘The relationships of activities with 1% solute as standard state and mass fraction of solute, and hot dip temperature, were given on the base of Miedema’s model, Tanaka expression, some basic thermodynamic relationships; and discussion was carried out on Zn Mn and Zn Ti binary alloys by calculation, in which varied colors can be achieved onthe hot dip steel sheets. The results indicate that the activity of solute shows positive deviation relative to Henry’s law for both Zn Mn and Zn Ti binary dilute solution. The degree of deviation increases with increasing solute and decreases with increasing bath temperature. As the solution is very dilute solution ( w (Mn)≤40% for Zn Mn alloy, w (Ti)≤8% for Zn Ti alloy), the two binary baths can all be treated as ideal dilute solutions. [
文摘The surface treatment technology can improve the corrosion resistance of steel sheets and increase the value of steel application.The surface treated steel sheets in Baosteel include zinc galvanized steel sheets,sin galvanized steel sheets,chromium galvanized steel sheets,and colour coating steel sheets with the application in the area from construction to automobiles,appliance,package,etc.The development,application and manufacturing technique of these products have become the core competition power of Baosteel. The article reviews the developments of surface treated steel sheets and surface treatment technologies in Baosteel in 10 years,especially hot dip galvanized high strength steel products used in vehicles.The article also looks forward into further developments of surface treatment steel products and technologies in Baosteel,which will focus on:①the new products of hot dip galvanized advanced high strength steels;②more environmental friendly products or functional coating products;③the development of surface treatment technologies to meet the requirement of higher surface quality in the marcket;④new type of surface treatment and coating technologies.
