Method for producing h-shaped steel with small compression ratio and low temperature by using oxide metallurgy technology

Abstract

The invention discloses a method for producing H-type steel with the small compression ratio and for low temperature through an oxide metallurgy technology. The method sequentially includes the processes of pretreatment of hot metal, converter smelting, LF refining, shaped blank continuous casting, heating, rolling and cooling. In the converter smelting process, the content of a Si component is adjusted to be in the range from 0.05 wt% to 0.25 wt% before steel tapping; in the LF refining process, steel ladles enter a refining station and then ferrozirconium are added to the steel ladles and titanium wires are fed to the steel ladles. Through the reasonable oxide metallurgy technology, nonmetallic inclusions in the steel are controlled, under the condition that an original production process of the H-type steel with the small compression ratio and for low temperature is not changed, evenness and compactness of casting blanks and product structures are improved, and therefore the problem that usually, the low-temperature performance and the mechanical performance of the H-type steel, with the small compression ratio and for low temperature, rolled by shaped blanks are poor and even disqualified is solved.

Description

technical field [0001] The invention relates to the technical field of production of hot-rolled H-shaped steel, in particular to a method for producing H-shaped steel with small compression ratio and low temperature by using oxide metallurgy technology. Background technique [0002] H-shaped steel has reasonable mechanical distribution, large cross-section coefficient, large bearing capacity, and is easy to assemble and rivet weld. It is an economical cross-section and high-efficiency section with more optimized cross-sectional area distribution and more reasonable strength-to-weight ratio. It has been widely used. With the progress of society and the development of science and technology, various buildings and structures have higher and higher requirements on the performance of steel materials, especially in terms of ensuring the stability and safety of structures. The current low-temperature steel products are mainly plates. Most H-beam products that require low-temperatur...

AI Technical Summary

Problems solved by technology

Rolling section steel products with special-shaped billets can improve the rolling capacity of the rolling mill and thus increase the output. However, for the production of thick-gauge products, due to the influence of the size of the billet, the compression ratio is often low, resulting in defects such as billet segregation and center porosity. Less than effective reduction or improvement

In addition, due to the complexity of the shape of steel products, there is still no effective means to control the cooling uniformly.

Therefore, the industry has the defects of unstable performance and low pass rate when producing low-temperature impact-resistant steel or small compression ratio low-temperature impact-resistant steel products

[0004] In order to solve the above problems, various solutions have been proposed in the industry, such as adding Ni and B in the metallurgical process, and making up for the lack of performance through microalloying. Affect the surface quality of the product; some manufacturers also add controlled cooling equipment to the production line to improve the structure through controlled rolling and controlled cooling to improve product performance, but this solution requires large investment and high maintenance costs

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