With the rapid development of high-strength low-alloy (HSLA) steel, Nb as an important microalloying element has received more and more attention in recent years. The application and behavior of Nb in HSLA steel, including microstructures optimization, refining grain size, and precipitation behavior of Nb-containing phases, were reviewed. Nb could play an important role in following manners: (1) Nb-containing phases promote ferrite formation, and Nb solute promotes bainite formation. (2) Nb solute atoms and Nb-containing phases can inhibit the growth of austenite grains and austenite recrystallization. (3) Nb(C,N) that precipitates in ferrite/bainite can provide more significant strengthening contribution (more than 300 MPa) than that in austenite (about 100 MPa). Some reasonable suggestions for the production of Nb-bearing HSLA steel with excellent mechanical properties were put forward.

随着高强度低合金（HSLA）钢的快速发展，Nb作为重要的微合金元素近年来越来越受到重视。综述了 Nb 在 HSLA 钢中的应用和行为，包括显微组织优化、细化晶粒尺寸和含 Nb 相的析出行为。Nb可以通过以下方式发挥重要作用：(1)含Nb相促进铁素体形成，Nb溶质促进贝氏体形成。(2)Nb溶质原子和含Nb相可以抑制奥氏体晶粒长大和奥氏体再结晶。(3) 在铁素体/贝氏体中析出的Nb(C,N)比在奥氏体中(约100 MPa)可以提供更显着的强化贡献(大于300 MPa)。