Continuous casting process for cold forging steel for low carbon boron-containing standard components

Abstract

The invention relates to a continuous casting process for steel in the field of metallurgy, in particular to a continuous casting process for cold forging steel for low carbon boron-containing standard components. Casting powder special for the cold forging steel for the low carbon boron-containing standard components comprises the following chemical compositions in percentage by weight: 31+ / -1.0 percent of SiO2, 25.0+ / -4.0 percent of CaO, 10.5+ / -4.0 percent of Al2O3, less than or equal to 1.5 percent of Fe2O3, less than or equal to 4.5 percent of MgO, less than or equal to 2+ / -1.5 percent of F-, 9.0+ / -1.0 percent of K2O+Na2O, 16+ / -2.0 percent of C solid and less than or equal to 0.5 percent of H2O. By the continuous casting process, a water gap can be effectively prevented from blocking the normal crystallizer liquid level fluctuation in the casting process, small corner cracks of casting blanks are avoided, the continuous casting is smooth, the internal and external quality of the casting blanks are high, and the surfaces of the casting blanks are not provided with cracks.

Description

technical field [0001] The invention relates to a continuous casting process of steel in the field of metallurgy, in particular to a continuous casting process of cold heading steel for low-carbon boron-containing standard parts. Background technique [0002] Cold heading steel, also known as riveting screw steel or cold forging steel, is a steel for standard parts with high interchangeability produced by using the plasticity of metals and adopting cold heading forming technology. The cold forming performance of cold heading steel is good. In the mechanical processing industry, cold drawing is used instead of hot-rolled material for cold cutting machining. The advantage of this process is that it saves a lot of man-hours, and at the same time, metal consumption can be reduced by 10%~30%, and the product has high dimensional accuracy. , good surface finish and high productivity, it is a more advanced machining process that has emerged in the past 10 years. It is mainly used ...

AI Technical Summary

Problems solved by technology

However, during continuous casting and pouring of this type of steel, the nozzle is prone to blockage, the liquid level of the crystallizer fluctuates greatly, and the castability is poor.

Sometimes there are dense small transverse cracks at the corners of the slab, and a large number of scars are produced on the surface of the corresponding wire rod, and the yield is not high; Can be scrapped