What role does titanium play in steel?

①Titanium has a strong affinity with nitrogen, oxygen, and carbon. It is a good deoxidizer and an effective element for nitrogen and carbon fixation.

②The compound of titanium and carbon (TiC) has extremely strong binding force and high stability. Only when heated to above 1000°C will it slowly dissolve into the solid solution of iron. TiC particles prevent steel grains from growing and coarsening.

③Titanium is one of the strong ferrite forming elements, reducing the austenite phase area. Solid solution titanium improves the hardenability of steel, while the presence of TiC particles reduces the hardenability of steel.

④When the titanium content reaches a certain value, precipitation hardening can occur due to the dispersion and precipitation of TiFe2.

① When titanium exists in ferrite in a solid solution state, its strengthening effect is higher than that of aluminum, manganese, nickel, molybdenum, etc., and inferior to beryllium, phosphorus, copper, and silicon.

②The influence of titanium on the mechanical properties of steel depends on its existence form, the content ratio of Ti to C and the heat treatment method. When the mass fraction of titanium is between 0.03% and 0.1%, the yield strength can be increased. But when the content ratio of Ti to C exceeds 4, its strength and toughness decrease sharply.

③Titanium can improve lasting strength and creep resistance.

④Titanium can improve the toughness of steel, especially low temperature impact toughness.

① Improve the stability of steel under high temperature, high pressure and hydrogen.

②Titanium can improve the corrosion resistance of stainless acid-resistant steel, especially the resistance to intergranular corrosion.

③In low carbon steel, when the content ratio of Ti to C reaches above 4.5, oxygen, nitrogen, and carbon are all fixed, so it has good resistance to stress corrosion and alkali embrittlement.

④ Adding titanium to steel with a chromium content of 4%-6% can improve the oxidation resistance of the steel at high temperatures.

⑤ Adding titanium to steel can promote the formation of the nitride layer and obtain the required surface hardness faster. Titanium-containing steel is called "rapid nitriding steel" and can be used to make high-precision screws.

⑥Improve the weldability of low carbon manganese steel and high alloy stainless steel

①When the mass fraction of titanium exceeds 0.025%, it can be regarded as an alloy element.

② As an alloy element, titanium is widely used in ordinary low alloy steel, alloy structural steel, alloy tool steel, high-speed tool steel, stainless acid-resistant steel, heat-resistant and rust-proof steel, permanent magnet alloy and cast steel.

③Titanium has been used as a variety of advanced materials and has become an important strategic material. It is used in more than half of the aerospace industry, such as aerospace vehicles, power machinery, etc.