Liquid iron inoculation process for ductile iron pipes
A technology for ductile iron pipes and molten iron, which is applied in the field of inoculation of molten iron for ductile iron pipes, can solve the problems that it is difficult to achieve mechanical properties such as strength and toughness of ductile iron pipes, reduce the number, reduce the high-temperature annealing temperature, and increase the tensile strength Effect
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Embodiment 1
[0007] Embodiment 1: molten iron inoculation process for ductile iron pipes, comprising the following steps: (1) inoculation in the spheroidizing bag, adding 0.4% inoculant of molten iron weight in the spheroidizing bag, adding an appropriate amount of inoculant in the spheroidizing process, After the inoculant is completely melted, enter the next procedure; (2) Incubate with the flow, add 0.2% inoculant of the molten iron weight in the pouring ladle, and after the molten iron is transferred into the pouring ladle, it can be 0.2% of the mass of the molten iron in the ladle % inoculant, pouring can only be done after the inoculant is completely melted; (3) pipe mold powder inoculation, spray pipe mold powder 20g / m on the inner surface of the pipe mold before pouring and when pulling out the pipe 2 ; Its key improvement is: increase tundish inoculation between described step (1) and step (2), add the inoculant of 0.15% of molten iron weight in tundish, after molten iron is transf...
Embodiment 2
[0009] Embodiment 2: molten iron inoculation process for ductile iron pipes, comprising the following steps: (1) inoculation in the spheroidizing bag, adding 0.5% inoculant of molten iron weight in the spheroidizing bag, adding an appropriate amount of inoculant in the spheroidizing process, After the inoculant is completely melted, enter the next process; (2) inoculate with the flow, add 0.15% inoculant of molten iron weight in the pouring ladle, after the molten iron is transferred into the pouring ladle, it can be inoculated according to 0.15% of the mass of molten iron in the pouring ladle % inoculant, pouring can only be done after the inoculant is completely melted; (3) pipe mold powder inoculation, spray pipe mold powder 25g / m on the inner surface of the pipe mold before pouring and when pulling out the pipe 2 ; Its key improvement is: increase tundish inoculation between described step (1) and step (2), add the inoculant of 0.2% of molten iron weight in tundish, after m...
Embodiment 3
[0010] Embodiment 3: molten iron inoculation process for ductile iron pipes, comprising the following steps: (1) inoculation in the spheroidizing bag, adding 0.6% inoculant of molten iron weight in the spheroidizing bag, adding an appropriate amount of inoculant in the spheroidizing process, After the inoculant is completely melted, enter the next process; (2) Incubate with the flow, add 0.25% of the inoculant of the molten iron weight in the pouring ladle, and after the molten iron is transferred into the pouring ladle, it can % inoculant, pouring can only be done after the inoculant is completely melted; (3) pipe mold powder inoculation, spray pipe mold powder on the inner surface of the pipe mold before pouring and when pulling out the pipe 30g / m 2 ; Its key improvement is: increase tundish inoculation between described step (1) and step (2), add the inoculant of 0.25% of molten iron weight in tundish, after molten iron is transferred into tundish, can according to middle 0...
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