Production method for preventing micro-alloyed steel continuous casting slab straightening and hot-feeding cracks
A production method and technology for micro-alloyed steel, applied in the field of steelmaking, to achieve the effects of improving high-temperature plasticity, improving strength and plasticity, and preventing the formation of straightening cracks
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Embodiment 1
[0021] When producing aluminum-killed steel blooms with a cross-section of 300mm×390mm and the brand SCM435 (mass percentage of chemical composition: C: 0.35%, Al: 0.033%), the ordinary continuous casting cooling process is adopted to hot charge and heat the billet, and the billet is put into the furnace When the surface temperature was 738°C, after the bloom was opened into a billet, the occurrence rate of surface cracks was as high as 10.6%, such as figure 1 and image 3 shown. When the present invention is adopted, the surface temperature of the billet before rapid cooling is 920°C, the four-sided spray mode of full water spray is adopted, the cooling water volume is 280L / min, the spray pressure reaches 8.2MPa, the surface cooling rate is 5.8°C / s, and the rapid cooling Finally, the surface temperature of the billet is 420°C. After tempering, the surface temperature of the billet at the straightening position is 568°C. The highest surface temperature after tempering is 650°...
Embodiment 2
[0023] When producing aluminum-killed steel billets with a cross-section of 140mm×140mm and a grade of 10B21 (mass percentage of chemical composition: C: 0.22%, Al: 0.030%), the ordinary continuous casting cooling process is adopted to hot charge and heat the billets for straightening The corner temperature of the billet was 848°C. After the billet surface was pickled, many transverse crack defects were found at the corners, and the crack incidence rate reached 33.3%. After the billet was rolled, the wire rod returned to scrap aluminum as high as 3.8%. When the present invention is adopted, the full water spray mode is adopted, the cooling water volume is 260L / min, the spray pressure reaches 7.5MPa, and the surface cooling rate is 6.5°C / s. After rapid cooling, the billet surface temperature is 415°C. , The surface temperature of the billet at the straightening position is 566°C, no transverse crack defects at the corners were found in the pickling of the billet sample surface, ...
Embodiment 3
[0025]When producing 220mm×1260mm grade X70 (chemical composition mass percentage C: 0.06%, Nb: 0.07%) continuous casting slabs of pipeline steel containing Nb, the ordinary continuous casting cooling process is adopted, and the surface temperature of the slab at the straightening position is 906 ℃, the inspection of the continuous casting slab blank found that there are many surface transverse cracks in the corner, and the crack occurrence rate is as high as 15.2%. When the present invention is adopted, the steam-water four-sided spray mode is adopted, the cooling water volume is 350L / min, the spray pressure reaches 8.0MPa, and the surface cooling rate is 6.2°C / s. After rapid cooling, the billet surface temperature is 440°C. , The surface temperature of the billet at the straightening position is 587°C. After inspection of the continuous casting slab billet, no transverse crack defects at the corners were found.
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