Rare earth corrosion-resistant steel rich in alloyed rare earth elements and manufacturing method of rare earth corrosion-resistant steel

Abstract

The invention discloses rare earth corrosion-resistant steel rich in alloyed rare earth elements and a manufacturing method of the rare earth corrosion-resistant steel. The steel is characterized in that the rare earth elements are one or more of cerium Ce, lanthanum La and yttrium Y, and in percentage by weight, the content of the alloyed rare earth elements is controlled to range from 0.005 wt%to 0.045 wt% through a steelmaking rare earth wire feeding process. According the provided economical corrosion-resistant steel, the yield strength grade is 235 MPa or above or the yield strength grade is 355 MPa or above, and the relative corrosion rate at a 96-hour periodic infiltration corrosion test is smaller than 70% (compared with Q235B in the national standard <Common Carbon Steel> GB / T700); and the steel can be widely applied to constructional engineering, indoor engineering, and coating-free steel structure engineering under the outdoor atmospheric environment in an arid and rainless area.

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 for 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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