Heating method for casting blank corner part

Abstract

The invention discloses a heating method for a casting blank corner part. The method is completed by using a casting machine. The casting machine is provided with a coal-oxygen burner. The method is specifically performed according to the following steps: (1) in a continuous casting process of the casting machine, using flame of the coal-oxygen burner to directly heat the continuous casting blankcorner part, and warming the corner part and an edge part; (2) in a heating process of the coal-oxygen burner, controlling a flow rate of a coal gas and an oxygen gas to be less than or equal to 800 m<3> / h; (3) in a condition of 5-8 m / min of a pulling rate, and 50-120 mm of a casting blank thickness, within 4-8 s, improving a casting blank temperature to 150-240 DEG C. The method is capable of using the simple coal-oxygen burner to perform direct flame heating in allusion to the edge part of a continuous casting blank, wherein the method is suitable for a heat compensating process of the edgeand corner parts of the current continuous casting blank in a high pulling rate production condition, through improving temperature uniformity, avoiding the edge part from cracking, thereby reducing fracture probability, and reducing crack generation of the edge part and a cracking degree, and in the condition of 5-8 m / min of the pulling rate, and 50-120 mm of the casting blank thickness, rapidlyimproving the casting blank temperature to 150-240 DEG C.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a corner heating method of a slab. Background technique: [0002] In the process of producing various steel blanks in steel plants, there are two methods for controlling the solidification of molten steel: die casting and continuous steel casting. The continuous steel casting method is Continuous Steel Casting in English, which belongs to the most important method of steel slab production. In the 1950s, continuous casting technology began to be gradually used in European and American countries, thus realizing the direct casting of molten steel to form slabs or round billets. Compared with traditional methods, billet continuous casting technology has significant advantages such as greatly improving metal yield and billet quality, and saving energy. Now more than 90% of steel-like slabs are continuously cast. [0003] Of course, a large number of specific technica...

AI Technical Summary

Problems solved by technology

[0005] Another major defect is the problem of edge / corner cracks. Due to the large heat dissipation area at the edge of the slab, the solidification process and temperature drop are relatively large, so it is very easy to accumulate a large amount of stress at the edge, and there is a solid phase- In the case of the coexistence of liquid phase, the hardness and deformation behavior are very different, so cracks are easily generated at the edge of the billet during the process of passing through the tension leveler and bending roll

The slab is broken and the quality of the edge is reduced (the amount of edge trimming increases, resulting in a decrease in yield)

[0006] In order to solve the problem of heat soaking at the edge, relevant workers have proposed corresponding solutions, such as chamfering crystallizers—that is, performing a certain distance of chamfering at the four corners of the slab. For example, patents 105057613B and 104399917A respectively disclose a chamfering The method of corner crystallizer and arc-shaped chamfering crystallizer, this method solves the problem of excessive heat dissipation at the corner to a certain extent, but the cracks caused by the temperature drop still exist, and the amount of edge trimming is still large

Images