A kind of high-carbon boron-containing steel slab continuous casting method
A technology of slab continuous casting and boron steel, which is applied in the field of high-carbon boron-containing steel slab continuous casting, can solve problems such as corner cracked slabs, fractures, and large surface cracks, and achieve the effect of reducing equipment damage
Active Publication Date: 2019-04-23
SHOUGANG CORPORATION
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Problems solved by technology
[0004] The invention provides a method for continuous casting of high-carbon boron-containing steel slabs, which solves or partially solves the problems in the prior art that large surface cracks, corner cracks and slab fractures are easy to occur during the casting process of high-carbon boron-containing steel. question
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[0015] see figure 1 , a high-carbon boron-containing steel slab continuous casting method provided by an embodiment of the present invention, comprising the following steps:
[0016] Step 1, controlling the N content of molten steel to be ≤50ppm, and the B content to be ≤0.003%.
[0017] In step 2, a low superheat process is adopted for the molten steel, and the superheat is controlled at 5-15°C.
[0018] Step 3, using a low casting speed for the molten steel, and the casting speed is controlled at 0.85-1.1m / min.
[0019] Step 4, crystallize the molten steel, the water volume of the narrow surface of the crystallizer is 390-460L / min, and the water volume of the large surface of the crystallizer is 3800-4400L / min.
[0020] Step 5, performing gas mist cooling on the molten steel, and the specific water volume of the secondary cooling is 0.60-0.80L / kg.
[0021] Step 6: Obtain the casting slab, and adopt hot charging and hot delivery for the casting slab, and the hot delivery t...
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The invention provides a high-carbon boron-containing steel slab continuous casting method, and belongs to the technical field of steelmaking. The high-carbon boron-containing steel slab continuous casting method comprises the following steps that the content of N of molten steel is controlled to be smaller than or equal to 50ppm, and the content of B of the molten steel is controlled to be smaller than or equal to 0.003%; the low superheat degree technology is conducted on the molten steel, wherein the superheat degree is controlled to range from 5 DEG C to 15 DEG C; the low drawing speed is conducted on the molten steel, wherein the drawing speed is controlled to range from 0.85m / min to 1.1m / min; the molten steel crystallizes, the volume of water on the narrow surface of a crystallizer ranges from 390L / min to 460L / min, and the volume of water on the large surface of the crystallizer ranges from 3800L / min to 4400L / min; mist cooling is conducted on the molten steel, and the specific water flow of secondary cooling ranges from 0.60L / kg to 0.80L / kg; and a casting slab is obtained, the mode of hot charging and hot delivery is adopted by the casting slab, and the hot delivery temperature is larger than or equal to 600 DEG C. The high-carbon boron-containing steel slab continuous casting method can effectively solve the problems that large-surface cracks and corner cracks are prone to being generated in the high-carbon boron-containing steel pouring process, and the slab is broken in the casting process, and effectively reduce the number of safety accidents such as equipment damage.
Description
technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for continuous casting of high-carbon boron-containing steel slabs. Background technique [0002] High-carbon boron-containing steel is often used as springs and saw blades for manufacturing machinery and equipment. High-carbon boron-containing steel is usually produced by billets. However, with the increase in demand for large-section saw blades, continuous casting of slabs is required. Slabs Large surface and corner cracks are prone to occur during the casting process. [0003] Due to the high carbon content and low liquidus temperature of high-carbon boron-containing steel, vicious accidents such as casting failure and steel breakout are prone to occur, which have a relatively large impact on the continuous casting production line and seriously affect the production rhythm. Due to high carbon It is difficult to cast boron-containing steel. At present, there are r...
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IPC IPC(8): B22D11/18B22D11/22
CPCB22D11/001B22D11/18B22D11/225
Inventor 刘国梁陈斌马文俊崔阳季晨曦李海波倪有金马威朱建强刘阳春赵东伟刘柏松高攀
Owner SHOUGANG CORPORATION