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| Carbon Macro-Segregation Control of Rolled Bar Produced From Cast Bloom of 20CrMnTiH Steel |
| WU Qing-ming1,XU Wei-yang2,YAN Hui-cheng2,XU Rui-jun1,LIU Jian1,QIU Sheng-tao2 |
1. Xiangtan Steel Co.， Ltd., Xiangtan 411101, Hunan, China
2. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The 20CrMnTiH rolled bars produced from cast bloom(300mm×430mm) occurred serious pattern segregation in Xiangtan Steel, which was bad for the finished product quality. By the properly adjusting the casting operation techniques, the quality of rolled bars was improved. After casting system was adjusted such as increasing the water flow rate (from 0.27L/kg to 0.35L/kg) and decreasing the strength of mold magnetic stirring (from 400A to 200A and 0), the rate of exquiaxed zone decreases with the reducing of stirring strength and the carbon segregation patterns of cast blooms are different whether the magnetic stirring was on or off. The pattern segregation of rolled bar disappeared when the magnetic stirring was off, and the distribution of carbon content and hardness of rolled bar was the most homogeneous and the quality was improved.
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Received: 10 June 2011
Published: 22 May 2012
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2012, Vol. 47 
