Titanium rolling process and performance
Titanium rolling refers to the structural control of the rolled piece during the rolling process of metal materials to obtain plates or profiles with excellent structural properties.
The titanium rolling process uses the excellent corrosion resistance, mechanical properties and good plastic processing properties of titanium alloy to roll titanium alloy plates or profiles at a certain temperature to obtain the desired products.
Titanium plates, often called titanium steel or titanium alloy steel, have high properties such as corrosion resistance and fatigue strength.
At present, titanium alloy plates are widely used in industrial production.
Titanium is called "super steel" because of its excellent corrosion resistance.
However, since titanium rolled plates need to be cooled during rolling, cold rolled or cold-formed steel is generally used as auxiliary equipment related to cold bending and cold rolling in the rolling mill.
1. Titanium rolling process
Since titanium has high corrosion resistance, titanium alloys must be rolled at a certain temperature during the rolling process.
Titanium alloys can be divided into many types according to different uses.
For example, titanium alloys for aviation mainly include titanium-based alloys and chromium-titanium alloys:
Titanium-based alloys used in aviation generally refer to titanium-chromium alloy (also known as full titanium steel) and titanium nickel (also known as semi-full nickel steel).
The titanium alloys used to manufacture ships and aircraft are mainly titanium-nickel and vanadium alloy steels.
Most of these titanium steels are produced from vanadium-containing chromium vanadium titanium (VTi) stainless steel.
2. Several performance characteristics of titanium plates
Corrosion resistance: In seawater, the corrosion rate of titanium plates is much lower than that of other steels, so it is called "super steel".
Strength and plasticity: Titanium plates have good strength and plasticity and can meet the requirements of various uses.
Welding performance: Titanium alloy has excellent welding performance, and its welding process is relatively simple. Manual arc welding, high-frequency or low-frequency resistance welding, or brazing can be used.
Toughness: Titanium alloy has very good toughness and is not easy to break under impact load.
Work hardening properties: Titanium alloys have good processing properties. The required work hardening properties can be obtained through cold, hot deformation or mechanical processing, thus improving their plasticity and strength.
Stability: Because titanium has high chemical stability (almost does not react with other elements), titanium plates have strong corrosion resistance.
3. Introduction to factors affecting titanium plate rolling process
As the rolling temperature increases, the type, size and distribution of the precipitated phases in the titanium alloy sheet will change, and at the same time, its grain growth behavior will also change.
During the rolling process, because titanium alloy has high corrosion resistance and strong fatigue resistance, it is used as auxiliary equipment related to cold bending and cold rolling in the rolling mill.
However, since titanium alloy plates need to be cooled during the production process, they are generally used as a material for cold bending and cold straightening equipment.
During the cold deformation process, if the original structure of the plate is a slab structure or the slab has coarse grains, poor plate shape, or segregation, it will lead to high production costs and poor quality of titanium plates.
Therefore, it needs to be rolled and annealed in actual production to achieve better comprehensive mechanical properties and processing performance.
After annealing, the surface quality of the plate will become worse as the grain refinement becomes higher or other defects occur (such as severe segregation, etc.). Therefore, it is necessary to perform smoothing, edge removal, deburring and other treatments during the annealing process to obtain a more ideal surface quality of the plate.
