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The characteristic of chemical composition of X80 pipeline steel, the microstructure and the existing problems under the condition of high heat input welding were introduced in this paper. The micro-alloyed process of Nb, Ti, V elements in X80 pipeline steel and the influence on the mechanical properties were respectively discussed. In addition, the reasons of the grain coarsening in the welding heat affected zone, the softening and embrittlement in partial microstructure were explored and the corresponding solutions were presented. For X80 pipeline steel, we can see that high strength and high toughness microstructure can be obtained not only by micro-alloyed, but also through the optimization of rolling process and the regulation of cooling rate after hot rolling. X80 pipeline steel with low carbon content and the appropriate micro-alloying, coupled with modern controlled rolling a nd controlled cooling technology, will have very high strength and toughness. Scholars mainly studi ed on the composite micro-alloying of Nb and Ti, Al, Ti, Mg, Zr alloy oxides and complex oxide micro-alloying and Ca treatment desulfurization technology, and so on.

Research of Micro-alloyed Microstructure and Composition in X80 Pipeline Steel for High Heat Input Welding