Manufacturing method of composite corrosion-resisting steel

Abstract

The invention relates to the technical field of steelmaking, in particular to a manufacturing method of composite corrosion-resisting steel. The manufacturing method comprises the following steps of selecting raw materials for manufacturing the composite corrosion-resisting steel, steelmaking the selected raw materials through a converter, enabling molten steel smelted by the converter to flow into a crystallizer through a steel ladle and a tundish, feeding a rare earth wire into the crystallizer for continuous casting to produce a steel billet, and rolling the prepared steel billet. The manufacturing method of the composite corrosion-resisting steel mainly comprises the following steps of smelting Cr-containing and Ni-containing molten iron in a blast furnace in a converter, feeding the rare earth wire into the crystallizer in a continuous casting steel drawing process by utilizing residual Cr and Ni elements in the molten steel to produce the composite corrosion-resisting steel, and rolling the corrosion-resisting steel meeting the national standard through a controlled rolling and air cooling process, so that on one hand, the production cost can be saved, and on the other hand, the corrosion resistance of a steel bar can be improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a manufacturing method of composite corrosion-resistant steel. Background technique [0002] As a major steel country in the world, my country's crude steel output in 2019 was nearly 1 billion tons, accounting for 53.3% of the global total. However, both plain carbon steel (accounting for about 70%) and low alloy steel (accounting for about 20%) are faced with serious corrosion problems. According to statistics, the loss caused by corrosion in my country accounts for about 3-4% of GDP every year, and the loss is huge. Steel corrosion hazards are widespread in daily life and almost all industries, especially infrastructure steel is faced with atmospheric corrosion day after day. How to significantly improve the atmospheric corrosion resistance of construction steel at low cost is the key to the development and promotion of new corrosion-resistant steel. question. Rare earth...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for making composite corrosion-resistant steel to solve the problems of large alloy addition, high tapping temperature and high production cost in the production of composite corrosion-resistant steel in the prior art proposed in the above-mentioned background technology

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