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Production, Structure and Properties Control of Titanium Microalloyed Steel

  • Jixiang GaoEmail author
Chapter

Abstract

As a kind of microalloying element, titanium significantly improves the comprehensive properties of steel. However, when compared with niobium and vanadium microalloying technology, Ti-microalloying technology had not been extensively used in industry for a long time. It is because the properties of Ti-microalloyed steel fluctuate largely and the production process is not stable. Titanium is very active and tends to react with oxygen, nitrogen and sulfur to form large Ti-bearing phases which are harmful to the comprehensive properties of steel, such as TiO, TiS and Ti2CS. More importantly, the formation of these phases consumes a portion of titanium. This consumption not only reduces the volume fraction of TiC precipitated at low temperatures, but also significantly changes the chemical free energy of TiC precipitation. Therefore, the precipitation behavior of TiC is remarkably changed and its strengthening effect is greatly affected. In addition, the precipitation of TiC is sensitive to temperatures and the variation of production parameters remarkably affects the properties of steel. As a result, the mechanical properties of Ti-microalloyed steel products of different batches with the same chemistry or even different locations of the same batch fluctuate greatly.

Keywords

Effective titanium Titanium yield Inclusions Controlled rolling Strengthening mechanism 

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Copyright information

© Metallurgical Industry Press, Beijing and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Guangdong Polytechnic Normal UniversityGuangzhouChina

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