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6 Regarding the H-shaped steel of the blank and the near-final cross-section series, in order to reduce the blanking pass, increase the finished product rate and speed up the production rhythm, the cross-section continuous casting billet should be used. For example, Ma Steel's H-beam production line uses 750mmX I-shaped shaped continuous casting billets to produce 300-700 series HZ steel beams and HK steel columns. Compared with the continuous casting slab rolling, when the HK600mmX 305mm steel column is produced, the blanking pass is reduced from 27 passes to 7 passes, and the production rhythm is reduced from 189s to 56s. At the same time, the temperature drop of the rolling stock is small, rolling force The reduction, the energy consumption is reduced, and the head and tail "tongue" generated in the web portion during rolling is short and the cut loss is small. At present, the thickness of the web of the profiled blank is 120mm, which further reduces the head-to-tail "tongue" of the rolled piece, reduces the amount of head-to-tail cut and reduces the thickness of the blank of the casting blank, which is the development trend of the shaped continuous casting billet. A profiled blank having a web thickness of 50 mm has been developed.
For the shape and cross-sectional dimensions of continuous casting billets for steel production, if it meets the product specification requirements or “near-final shape†and the structure is compact, the performance meets the requirements of rolled products, which is the most economical steel production method. However, the metallurgical mechanism and structural type of the continuous casting machine must be fundamentally changed, and the processing mechanism must be integrated into one.
For the steel core of Y4mm welding rod, because its application is different from the performance requirements of other wires, as long as the chemical composition meets the requirements, the fluctuation range is small and stable, so it is feasible to directly cast the wire rod for Y4mm welding rod, which can save heat. Rolling wire and cold-rolling into two complex and costly processes.
7 Conclusion For the different specifications of the profile steel products, the continuous casting billets with different cross-section dimensions should be selected.
The rectangular section continuous casting billet is superior to the square section continuous casting billet, and the square ratio is in the range of 1:1.25~1.55.
The selection of the shape and section size of the continuous casting blank must be optimized for the production of the product, and the continuous casting machine can be highly efficient.