Abstract
Due to defect of poor heat preservation property, the common steel ladles can’t pour numbers of boxes by one bag for special steel, such as high manganese steel which is sensitive to casting temperature, casting grain size and mechanical properties. The common steel ladles cooling fast often cause cold ladle and misrun. For better insulation, a vacuum insulation layer was added to the ladle to maintain the temperature of the molten steel, reduce the heat absorption of molten steel by ladle and reduce heat exchange with the outside world. The test results showed that the vacuum-lined steel ladle had a desired insulation performance which was much better than ordinary ladle. It improved the properties of castings and also had distinct energy - saving effect. Its good insulation performance brought a series of advantages, such as heating up fast during preheating of ladle, pouring temperature of molten steel could be further reduced, refining the casting grain size, improving the mechanical properties of the casting and wear resistance. Good insulation performance also could extend pouring time. At the same time, the low temperature ladle wall brought good working environment to foundry workers.
Highlights
Zhejiang Wujing Machine Manufacture Co., ltd. is one of the top 100 casting manufacturers in China with annual output of 35000 tons castings
Because the pouring temperature [2] obviously affects casting grain size and mechanical properties [3, 4] of the high manganese steel, its starting pouring temperature must be below 1400°C
Due to good heat preservation property of the vacuum lined steel ladle, compared with ordinary ladles, the temperature of molten steel can be increased by 1°C per minute during the pouring process
Summary
Zhejiang Wujing Machine Manufacture Co., ltd. is one of the top 100 casting manufacturers in China with annual output of 35000 tons castings. Because the pouring temperature [2] obviously affects casting grain size and mechanical properties [3, 4] of the high manganese steel, its starting pouring temperature must be below 1400°C. By the end of pouring, the molten steel temperature fell faster which often led to defects such as cold ladle [5, 6, 7], insufficient pouring, unclear cast letters, etc. These problems had heavily affected the normal production of the workshop. Its capacity was reduced from 7 to 5 tons, the rest space was used to increase the vacuum insulation liner. All the contact places with molten steel except nozzle bricks and bottom - blow argon vent bricks was insulated by vacuum liner
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