Rare earth microalloyed high-strength construction steel bar and production method thereof

Abstract

The invention discloses a rare earth microalloyed high-strength construction steel bar and a production method thereof, and belongs to the technical field of steel for construction structures. The novel high-strength construction steel bar is provided, rare earth alloy cored wires are developed according to the variety of the rare earth microalloyed high-strength steel bar, qualified steel bars meeting the national standard requirements are obtained in high-strength steel bar production, and the problem that in the prior art, expensive elements such as V are often used, and consequently the cost is high is solved. The construction steel bar is prepared from the chemical compositions in percentage by weight: 0.20%-0.25% of C, 0.40%-0.80% of Si, 1.1%-1.60% of Mn, greater than 0.025% of Re, less than 0.045% of P, less than 0.045% of S, and the balance of Fe and inevitable impurities, wherein the mass percentage of O, Ca and Mg meets the formula of O / S<0 2, and Re / (Ca+Mg) is controlled between 10-100. The cost is lowered while the construction steel bar meets the national standard requirements.

Description

technical field [0001] The invention belongs to the technical field of steel for building structures, and in particular relates to a rare earth microalloyed high-strength building steel bar and a production method thereof. Background technique [0002] The development of rare earth steel has a history of several decades. my country is a major producer of rare earth, and the technology of rare earth production and application in steel is at the leading level in the world. The application of rare earths in steel includes rare earth treatment technology and rare earth microalloying technology. The functions of rare earths in steel include: purifying molten steel, improving the shape of inclusions, improving the solidification structure, and microalloying. At present, the effects of rare earth microalloying include: it has a significant effect on the wear resistance, corrosion resistance, heat resistance, low temperature resistance, fatigue resistance, oxidation resistance, hig...

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a rare earth micro-alloyed high-strength building steel bar and its production method. The present invention uses rare earth as a micro-alloying element to provide a new high-strength building steel bar, and aims at rare earth micro-alloyed Developed a special rare earth alloy cored wire and its continuous casting production wire feeding technology for high-strength steel bar varieties, obtained qualified steel bars that meet the requirements of national standards in the production of high-strength steel bars, and solved the problem of expensive elements such as V commonly used in the prior art. high cost problem

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