Nitrogen as an Alloying Element in Steels : The Effect of Nitrogen on the Tempering of Cold-Worked Steels

The present investigation has been carried out to ascertain the effect of nitrogen on the tempering of the cold-worked steels. On steels containing various percentage of nitrogen, manganese, aluminium and titanium, the magnetic and electrical properties have been measured under the condition of cold-working and tempering. From these investigation it has become clear that : (A) The changes at about 100, 250 and 400～550℃ begin to appear with the addition of nitrogen and become conspicuous as the nitrogen increases. (B) The relief of cold-working stress begins to appear at the temperature of about 300℃. (C) The change at about 100 or 250℃ is due to the precipitation of nitrogen or carbon. (D) The changes at about 400～550℃ and 650℃ are due to re-solution of nitrogen and carbon respectively. (E) The effect of nitrogen is reduced as manganese increases