High nitrogen stainless steel wire

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Abstract
The effect of nitrogen as a solid solution strengthening element in steel is well known, but is also generally associated with embrittlement. The present work describes the nitrogenation of nitrogen alloy stainless steel wire to produce material of high nitrogen content, which is shown to have beneficial effects on strength and corrosion resistance. Heat treatment of the alloys to induce precipitation of chromium nitride causes embrittlement, but when nitrogen is retained in solid solution excellent ductility is obtained. Pilot plant wire drawing trials show that suitable combinations of wire drawing and heat treatment can be devised to produce high strength stainless steel wire; development of manufacturing technology to give higher nitrogen concentrations will lead to still greater improvements in properties. MST/706