A rare earth corrosion-resistant steel rich in alloyed rare earth elements and its manufacturing method

Abstract

A rare-earth corrosion-resistant steel rich in alloyed rare-earth elements and a manufacturing method thereof, wherein the rare-earth elements are one or more of the three elements of cerium Ce, lanthanum La, and yttrium Y, in terms of mass percentage wt%, so The rare earth element content of the alloying is controlled at 0.005-0.045 through the process of feeding rare earth wire in steelmaking, which can provide a yield strength level of 235MPa or more or a yield strength level of 355MPa or more, and the relative strength of the 96-hour period immersion corrosion test An economical corrosion-resistant steel with a corrosion rate of less than 70% (compared with Q235B in the national standard "Ordinary Carbon Steel" GB / T700), it can be widely used in construction projects, indoor projects, and paint-free outdoors in dry and rainless areas. Steel structure engineering.

Description

technical field [0001] The invention relates to rare earth corrosion-resistant steel technology, in particular to a rare earth corrosion-resistant steel rich in alloyed rare earth elements and a manufacturing method thereof. Various, in terms of mass percentage wt%, the alloying rare earth element content is controlled at 0.005-0.045 through the steelmaking process of feeding rare earth wire, and can provide a yield strength level of 235MPa or more or a yield strength level of 355MPa Above, and the relative corrosion rate of the 96-hour cycle infiltration corrosion test is less than 70% (compared with Q235B in the national standard "Ordinary Carbon Steel" GB / T700), economical corrosion-resistant steel can be widely used in construction engineering, indoor engineering, Paint-free steel structure engineering in outdoor atmospheric environment in arid and rainless areas. Background technique [0002] In the atmospheric environment, oxidation and rust on the surface of metal ma...

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Problems solved by technology

However, in terms of the economy of this invention, there are many problems, as follows: (1) No expensive alloy elements are used, and the cost seems to be low, but the method of preparing the steel ingot is vacuum magnetron melting arc, and the process is a special Smelting does not belong to the conventional mass production process, and the cost of smelting is high; (2) According to the existing low-alloy steel production process, such as primary smelting-refining-continuous casting in converter / electric furnace, the composition of the invention cannot be stably produced in batches, or even production; (3) emphasizing high Si and Al content, which has a significant impact on the welding performance of the material, and there may be many problems to be solved in actual use

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