At room temperature, titanium rods do not react with nitrogen, but at high temperatures, titanium is one of the few metallic elements that can be burned in nitrogen, where the combustion temperature is about 800 degrees higher than that of molten titanium and nitrogen react violently.In addition to the nitrides (Ti3N, TiN, etc.) that can form titanium, the reaction of titanium with nitrogen also forms Ti-N solid solution. When the temperature is 500-550 degrees, titanium begins to absorb nitrogen obviously, forming interstitial solid solution. When the temperature reaches more than 600 degrees, the rate of nitrogen absorption of titanium increases. In the Ti-N solid solution, the phase transition temperature of titanium increases because nitrogen enters the titanium lattice in the form of titanium nitride, and nitrogen is also the stabilizer of titanium. At 1050 degrees, the solubility (mass fraction) of nitrogen in the medium is 7%, and at 2020 degrees, the solubility (mass fraction) of nitrogen in titanium is 2%. However, the rate of nitrogen absorption in titanium is much slower than its rate of oxygen absorption, so titanium is mainly oxygen absorption in air, nitrogen absorption is secondary.

Titanium reacts with H to form TiH, TiH2 compounds and Ti-H solid solutions. H is very well dissolved in titanium, and one mole of titanium absorbs almost two moles of H. The H absorption rate and amount of titanium rod are related to temperature and H pressure. H absorption of titanium is less than 0.002% at room temperature. When the temperature reaches 300 degrees, the H absorption rate of titanium increases. It reaches the value at 500 ~ 600 degrees. The amount of H absorbed by titanium decreases with the increase of temperature, and most of the H absorbed by titanium is decomposed when it reaches 1000 degrees Celsius. The increase of H pressure can accelerate the absorption rate of H and increase the amount of H absorption. On the contrary, titanium can be deHated under the reduced pressure condition. So the reaction between titanium and H is reversible. The reaction between titanium and H does not form a film on the surface, because the H atom is small in volume, it can quickly spread to the depth of the titanium lattice to form a gap solid solution. The dissolution of H in titanium can reduce the temperature of titanium phase transition. H is the stabilizer of Ti.