A project for advanced commercial manufacturing technologies for 500Mpa carbon steel, jointly undertaken by the Northeastern University, the Central Iron and Steel Research Institute, and Beijing University of Science Technology, applauds for the substantive progresses it has achieved. Based on the manufacturing technology for carbon steel at the 200Mpa level, the research team raises the yield strength of steel to 400-500Mpa without compromising its tenacity, elasticity and technical performance, using elements tuning and controlled rolling and cooling techniques.

Through studying the structural lines from recrystallization to morphological changes in fine carbon steel rolling, researchers worked out a technical roadmap and associated techniques for producing fine crystal grains and enhancing the composite intensity. Researchers, in collaboration with Baogang Steel, successfully turned out the steel strips at the 400Mpa level. In 2004, the research team, working with Meishan Company, a part of Baogang Steel, rolled out super fine ferritic steels and Bainitic bridge steel plates.

In the area of carbon steel bars, the research team, in collaboration with Shougang Steel, produced 12,000 tons of carbon steel bars at the 400-500MPa level, and exported 1,000 tons of 500Mpa steel bars meeting the UK standard. Researchers also improved the technologies for manufacturing threaded steel of |µ6-32mm, which promotes wider applications of the steel.

In addition, researchers improved the technical roadmap for manufacturing carbon steel plates, which found successful applications at Shougang Steel, Jiugang Steel, Angang Steel, and Nangang Steel.