In the 20th century, NKK's ironmaking sector sharpened its competitive edge by taking the initiative in developing innovative technologies and fulfilling social requirements. Noteworthy achievements included: extended utilization of various raw materials for ironmaking, improved productivity, and decreased energy consumption. These innovations are now being applied successfully to the expansion of NKK's environmental businesses. In the 21st century, technological breakthroughs will continue to be pursued, diversifying the areas of R&D in accordance with social needs.

Environment-related business, Low-Si hot metal production technology, Massive injection of pulverized coal, FIMPIT (Fiber in metallic tube for pig iron temperature), Cast copper cooling stave, Waste plastics, Waste toner, Productivity, Labor-saving, Prolongation of coke oven's life