Prospect and forecast of development of niobium microalloyed steel

According to the paper "Development of Niobium microalloyed Steel in China", China started the development and application of new microalloyed steel in the 1980s. In the 1990s, most of the new projects designed by the state are niobium steel (such as pipeline steel, ship plate steel, automobile steel, etc.). The state has also put the development of microalloyed steel into the direction of the adjustment of steel variety structure, and put forward the goal of transforming China's advantages in niobium, vanadium, titanium and rare earth resources into product advantages.

Then, what is the prospect of developing niobium microalloyed steel?

In fact, the research and development of niobium-containing microalloyed steel focuses on strip materials, and the preparation technology of microalloyed steel has become mature. The level of physical properties of steel has been greatly improved. Thus enhance the market competitiveness of enterprise products. For a period of time in the future, the focus of technology orientation should continue to be on the long profile and casting and forging parts while the production technology of strip material is further studied.

From low carbon steel to medium and high carbon steel, from low alloy engineering structure steel to mechanical structure steel, stainless steel and heat resistant steel extension.

After the new standard of hot-rolled steel bar for construction (gb1499-98) is issued, it opens a gap for the development of niobium-containing 400Mpa steel bar and the development of fire-resistant and earthquake-resistant steel bar. Compared with the steel bar containing vanadium and titanium, it will show technical advantages and broad application potential. In the long run, the automobile tractor and machine tool manufacturing industry are the important application fields of niobium steel, and the development of low carbon bainite and martensite non-tempered and tempered steel is suitable for China's national conditions. In order to improve the yield strength, toughness and fatigue properties of cast forgings, niobium microalloying will achieve obvious results.