Tank steel based on continuous casting and rolling production line and production method thereof
A production method and technology of rolling production line, which are applied in the field of steel for tank body and its production, can solve the problems of large fluctuation of steel coil performance, large difference in welding seam, product quality defect, etc. The effect of suppressing the precipitation and growth of inclusions and improving the quality of the strip shape
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Embodiment 1
[0033] Example 1: According to the method of the present invention, the finished steel for the tank body with a thickness specification of 3.75 mm is tested, and the chemical composition of the slab is C: 0.06%, Si: 0.05%, Mn: 1.50%, P: 0.011%, S: 0.006% , Nb: 0.010%, Ti: 0.050%, Als: 0.026%; the average superheat of the tundish steel level in the continuous casting process is 24°C, the casting speed is 3.85m / min, and the thickness of the slab at the exit of the segment is 70mm; the slab is heated in the heating furnace 45min, the exit temperature of the furnace was 1156°C, the exit temperature of the soaking furnace was 1034°C, the final rolling temperature was 890°C, and the coiling temperature was 610°C. After air-cooling to room temperature, it is leveled. During the leveling process, the rolling force is 258t and the elongation is 0.3%.
[0034] figure 1 It shows that the finished steel for the tank with a thickness specification of 3.75mm produced in Example 1 has quasi...
Embodiment 2
[0035] Example 2: Test the finished steel for the tank body with a thickness specification of 3.75mm. The chemical composition of the slab is C: 0.06%, Si: 0.05%, Mn: 1.50%, P: 0.011%, S: 0.006%, Nb: 0.010 %, Ti: 0.070%, Als: 0.026%. The average superheat of the tundish steel level in the continuous casting process is 22°C, the casting speed is 3.85m / min, and the thickness of the slab at the exit of the fan section is 70mm; The rolling temperature is 890°C, and the coiling temperature is 620°C. After air-cooling to room temperature, it is leveled. During the leveling process, the rolling force is 260t and the elongation is 0.3%.
[0036] figure 2 It shows that the finished steel for the tank with a thickness specification of 3.75mm produced in Example 2 has quasi-polygonal ferrite + a small amount of precipitation, the grain structure is uniform, and the rating of inclusions is D0.5; its mechanical performance test and plate shape Test results: the yield strength is 653MPa...
Embodiment 3
[0037]Example 3: Test the finished steel for a high tank body with a thickness of 3.75 mm. The chemical composition of the slab is C: 0.02%, Si: 0.05%, Mn: 1.00%, P: 0.011%, S: 0.006%, Nb: 0.050%, Ti: 0.078%, Als: 0.026%. In the continuous casting process, the average superheat of the steel level in the tundish is 20°C, the casting speed is 3.85m / min, and the thickness of the slab at the exit of the sector section is 70mm. The slab was heated in the heating furnace for 46 minutes, the exit temperature was 1153°C, the exit temperature of the soaking furnace was 1030°C, the final rolling temperature was 890°C, and the coiling temperature was 640°C. After air-cooling to room temperature, it is leveled. During the leveling process, the rolling force is 257t and the elongation is 0.3%.
[0038] image 3 It shows that the finished steel for the tank with a thickness specification of 3.75 mm produced in Example 3 has quasi-polygonal ferrite + a small amount of precipitation, the gr...
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