Magnesium-containing steel 45 and preparation process thereof

Abstract

The invention discloses magnesium-containing steel 45 and a preparation process thereof, and relates to the technical field of steel production. The steel 45 comprises the following chemical components of, in percentage by mass, 0.45%-0.48% of C, 0.17%-0.37% of Si, 0.65%-0.80% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.0005%-0.0020% of Mg, and the balance iron and inevitable impurities. On the basis of ensuring the safe production of the steel 45, the inclusion in the steel is modified by feeding a magnesium-silicon cored wire into molten steel at the final stage of refining, so that the inclusion in the steel is converted into the fine and dispersively distributed sulfide-oxide composite inclusion, the rating of the inclusion is optimized, and the comprehensive mechanical property of the steel 45 is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a magnesium-containing 45 steel and a preparation process thereof. Background technique [0002] 45 steel is a medium-carbon high-quality carbon structural steel widely used in machinery manufacturing. It has a wide range of applications and a large demand. After normalizing or quenching and tempering, it has certain strength and plastic toughness. It is often used in the production of vehicles, ships, Connecting rods, shafts, gears, piston pins and other components required for industrial and agricultural tools occupy the vast steel market with the advantage of lower production costs. Therefore, improving the product quality and applicability of carbon structural steel represented by 45 steel and reducing its production cost have gradually become the focus of scientific research personnel. [0003] 45 steel is a typical medium-carbon structural steel containin...

AI Technical Summary

Problems solved by technology

However, calcium, magnesium, and sulfur are compounded into steel, and complex chemical reactions will occur with elements such as oxygen, manganese, silicon, and aluminum in the steel to form various oxides containing magnesium, calcium, aluminum, silicon, and magnesium. , calcium, manganese sulfides, these oxides, sulfides and composite inclusions are complex in composition, difficult to control the shape, and it is difficult to control the ratio of calcium, magnesium, sulfur, etc., and the production cost is high

[0006] The Chinese patent with the patent number CN201610154798.4 discloses a production method of low-carbon steel, which mainly solves the difficulty of controlling inclusions in low-carbon steel smelted in the prior art converter, which cannot meet the normal casting and low-carbon requirements of the slab continuous casting machine. The technical problem of high steel production cost, the cleanliness of the molten steel produced is high, the average content of total oxygen in molten steel is 16.5ppm, the average content of phosphorus is 95ppm, and the content of harmful element phosphorus in molten steel is greatly reduced

This method will increase the smelting procedure, and it is very difficult to control each smelting procedure, and the effect of controlling the formation of inclusions and the content of harmful element phosphorus in the steel only by optimizing the smelting procedure is limited. Reasonable changes to the inclusions in the steel Only by improving the quality and harmless treatment can the comprehensive mechanical properties of materials be improved to a greater extent

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