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| Analysis and improvement of prestressed high-strength steel PSB930 |
| SONG Hong-wei, WANG Dong-xing, REN Yi, WANG Wu-lei, YANG Wei-yong, WANG Chun-mei |
| Institute of Research of Iron and Steel, Wuhu Xinxing Casting Pipe Co.,Ltd.,Wuhu 241002,Anhui,China |
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Abstract In order to study the cause of surface depression, crack and other defects of PSB930 billet. By means of pickling, chemical composition, scanning electron microscope and energy spectrum analysis, it is confirmed that the concave defects of PSB930 billet are mainly caused by the stress concentration formed by improper cooling in the mold, and the surface crack defects are mainly caused by sulfide inclusions formed by high S content, and the intergranular cracks produced by the combined action of thermal stress and sulfide inclusions during cooling. By optimizing the refining deoxidation and desulfurization system, adjusting the water volume of the continuous casting mold to 115-120 m3/h, the specific water volume of the secondary cooling to 0.5 L/kg, the water distribution ratio to 31∶26∶20∶13∶10, controlling the superheat of the tundish to 20-30 ℃, optimizing the basicity of the mold powder to 0.95, and the viscosity to 2.5 Pa·s, the concavity and crack defects on the surface of the slab were basically eliminated, and the product quality of the rolled material was guaranteed.
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Received: 18 August 2022
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2023, Vol. 42 
