Pure Titanium Coils

Pure titanium coils are generally supplied in rolls and offer advantages such as high dimensional accuracy, good surface quality, ease of processing, and material efficiency. The width is typically within 1500 mm, while the length may vary slightly depending on the size of each roll.

Similar to titanium plates, titanium strips are classified into pure titanium strips and titanium alloy strips based on the material used.
According to the processing method, they are divided into hot-rolled titanium strips and cold-rolled titanium strips.
According to the surface condition, titanium strips are categorized as having either an original rolled surface or a plated (coated) surface.

The surface of titanium coils is permitted to have slight darkening and localized water marks, as well as minor scratches, indentations, pits, grinding marks, and other imperfections that do not exceed half of the thickness tolerance. Annealed products are also allowed to have slight, localized scratches and wrinkles caused by the oil removal process.

However, the product surface must be free from macroscopic defects such as cracks, peeling, oxide scale, folding, metallic and non-metallic inclusions, and residues from alkali or acid washing.

Processing Flow:
Hot-rolled coil → Hot-rolled coil welding, lead belt linking → Annealing → Pickling → Surface grinding → Rolling → Cleaning → Vacuum annealing → Leveling, straightening → Finishing → Packaging.

Before cold rolling, lead belts are connected to both ends of the coil to improve the yield of finished products. The surface oxide layer formed on the titanium coil after hot rolling must be removed using a mechanical descaling and mixed acid pickling process.

Under normal conditions, a single-stand rolling mill can meet the production requirements for titanium coil cold rolling. However, due to the significant anisotropy of titanium, cold rolling typically uses a multi-roll mill with small-diameter working rolls operated under high tension.

Vacuum annealing is required for finished products to enhance surface quality. The purpose of leveling and straightening is to achieve the desired surface condition and an optimal plate shape for the finished titanium coil.

Raw Material Preparation:
Raw materials consist mainly of small coils that are assembled into large coils. This involves welding lead belts, trimming and updating lead belts, and cutting cracked edges. Since titanium coils are usually processed using reversible rolling mills, the head and tail ends of the coils cannot be rolled properly, resulting in significant material waste. To reduce this waste and improve the yield, guide belts must be attached to both ends of the coils before cold rolling.

When the lead belt is made of pure titanium-as is the strip blank-butt welding can be used for connection. However, if the lead belt is made of a different material (e.g., stainless steel), it cannot be welded directly and must be connected using mechanical riveting. Lead belts must be removed after cold rolling and can be reused.

A coiling unit must be installed during the raw material preparation stage to assemble hot-rolled small coils into large coils, weld lead belts to the hot-rolled coils, and replace the original lead belts after intermediate rolling with newly cut and properly sized ones.

To allow for the reuse of lead belts, a lead belt straightening unit must also be installed. This unit straightens and trims the ends of used lead belts and facilitates the production of new lead belts.