How Titanium Manufacturing Works: From Raw Material to Finished Product

When purchasing titanium products, you should know how they’re made. Titanium manufacturing starts with sponge titanium and follows different production paths for sheets, bars, tubes, wires, and forging rings. Understanding these processes helps you choose the right product and verify your supplier’s manufacturing capabilities for your application.

What is Titanium Manufacturing?

Titanium production is the process of extracting titanium element from natural ore and processing them into titanium products that can actually be used. First, we extract titanium from ore such as rutile and ilmenite. These ores undergo chemical treatment to produce porous, coarse-looking titanium sponges.

This sponge gets melted and cleaned and becomes a solid titanium ingot. The manufacturer then molds the metal into various shapes. In your industry, titanium plates, titanium rods, titanium tubes, titanium wires and rings may be required. Molding is done by forging, rolling and machining titanium.

Titanium production is very important in today’s titanium industry. Aircraft manufacturers use titanium for engines and frames. Doctors need titanium for implants and surgical instruments. Titanium metals are high in strength and lightweight and have better corrosion resistance than most metals, and are widely used in aerospace, medical, marine and automotive fields.

Titanium Manufacturing Process Overview

Sponge Titanium Production (Kroll Process)

The Kroll Process produces titanium sponges from titanium ore. This method has been the industry standard since 1940. The process begins with rutile or ilmenite ore containing titanium dioxide. It is converted to titanium tetrachloride by chemical reaction, after which magnesium removes oxygen at a temperature of 800-900 °C.

The gray porous material seen in titanium production facilities is titanium sponge. This substance was named after its sponge-like appearance with fine pores covering the surface. The quality of the final titanium product depends heavily on the purity of the sponge. The higher the purity, the less impurities, the better the product.

Pressure Electrode Stage

Sponge titanium is pressed and welded to large electrodes after production. These electrodes are raw materials for the melting process. Quality control examines the density and composition of electrodes to prevent contamination in subsequent titanium manufacturing processes.

Melting and Commodity Ingot Formation

Vacuum arc re-dissolving (VAR) dissolves electrodes in the vacuum chamber to form ingots. The vacuum state prevents oxygen contamination, that makes titanium brittle. The electric arc generates heat and melts the electrode drop by drop  into a water-cooled copper mold.

When purchasing titanium for critical applications, check the number of VAR cycles. In aerospace grade materials, most manufacturers perform VAR 2-3 times. The higher the number of cycles, the better the quality and the lower the defect.

Forging Piece Production

Ingot then goes to the forging process. Forging uses heat and pressure to break down the cast structure. This reshapes the grain structure of the metal and improves mechanical properties. Most titanium alloys are forged at 850-950 °C. Suppliers should explain the forging ratio. High forging ratio produces excellent properties.

Billet Manufacturing from Titanium Ingots

Forged parts are machined into billets and are raw materials for all product types. Surface treatment removes defects and forms smooth surfaces by grinding. Billets are sorted by size and grade. For titanium plate production, a slab-shaped billet is used, and cylindrical-shaped billet is used for bar material production . Tests include ultrasonic testing, chemical analysis, and mechanical property verification.

Titanium Sheet and Plate Manufacturing

Hot Rolling Process

Titanium sheet production starts with hot rolling. Slab billet is placed in a rolling machine heated to 900 °C or higher, and heavy rolls apply pressure from both sides. Each pass reduces thickness and slabs thin from a few inches to less than one inch. When ordering a hot rolling plate, assume that the surface oxidation is removed later. Hot rolling can be processed at high speed and is suitable for mass production.

Cold Rolling Process

Cold rolling uses higher pressure at room temperature to refine hot rolling plate. Multiple passes with precision rolls dramatically improve the surface finish. When precision control of thickness is required in the application, a cold rolling plate is suitable. This material is frequently required in medical devices and electronics because superior surface finishing reduces pollution risk. Cold rolling increases strength but reduces ductility.

Acid Alkali Washing and Surface Treatment

Acid cleaning removes scales and oxides generated during hot rolling. The sheet is immersed in a mixture of hydrofluoric acid and nitric acid and dissolves oxides without compromising the base material. The residual acid is neutralized by alkaline cleaning and chemical residue is removed by water washing. After proper cleaning, the final sheet should be a shiny metal surface.

Titanium Bar and Rod Manufacturing

Forging Process for Bars

The production of the rod begins by heating the cylindrical billet and forging it into a round or square shape. Forging produces superior grain flow compared to just machining large titanium materials. When purchasing forged rods, check the flow direction of the crystal grain. The longitudinal grain flow demonstrates the highest strength along the longitudinal direction of the rod material.

Correction and Straightening Steps

Forging rods are often warped by heat treatment and cooling stress. The corrective press corrects this by passing through a roller that adds a controlled bending force. Stress removal heat treatment prevents warping after correction.

Machining and Finishing

The final diameter of the rod is finished by turning, and the smoothest surface is obtained by grinding. Thread rolling adds threads for fasteners by screw rolling and achieves mirror finish for medical implants by polishing. Determine the required finishing process according to the application.

Titanium Tube and Pipe Manufacturing

Extrusion Method for Seamless Tubes

In seamless tube production, the billet heated from 900 to 1000 °C is pushed into the mandrel dies. The mandrel forms the inner diameter and the die forms the outer diameter. Seamless tubes provide excellent reliability in applications that handle high pressure systems. Because the weakness is eliminated due to the lack of welding parts.

Welding Method for Welded Pipes

Welded tubes are manufactured by tubular molding of titanium plate or band steel. By TIG welding, the end is joined in an inert atmosphere chamber that prevents oxidation with argon gas. Welded tubes are lower cost than seamless tubes and are suitable for low pressure applications.

Final Machining and Quality Control

All pipe materials require cutting, end surface processing, and deburring. Dimensional inspection checks the diameter and thickness. The internal defect is detected by ultrasonic detection and strength is verified by pressure resistance test. Check with your supplier for cleaning procedures for sensitive applications.

Titanium Wire Manufacturing

Wire material production begins by pulling the small diameter bar material through the dies. The hole diameter of each die is slightly smaller, which reduces the diameter and increases the length. Work hardening stresses are relieved by heat treatment between processes. When ordering titanium wire material, diameter tolerance is extremely important. Welding wires require uniform diameters, and medical sutures require extremely severe tolerances. The final wire diameter ranges from 0.1 mm to 6 mm.

Titanium Forging Ring Manufacturing

Rolling Ring Method

Large rings are produced from billets forged in a thick disc shape. In ring rolling, the inner diameter is enlarged while rotating the ring between the rollers and the thickness is reduced. When large diameter rings are required, this method corresponds to the size that cannot be economically produced by titanium machining. Aerospace engines use rings that exceed 6 feet (about 1.8 m) in diameter. Because the flow of crystal grains follows the ring circumference, excellent circular strength is obtained.

Machining for Precision

Ring forging requires machining to achieve final tolerance. Adjust the diameter by turning and flatten the ring faces with facing operations. The CNC processing center precisely processes complex shapes. After finishing, internal defects are inspected by non-destructive inspection.

Quality Standards in Titanium Manufacturing

The ASTM standard specifies most titanium product specifications. For ASTM B265, for B348, for rod, and for B861, for seamless tubes. Aerospace manufacturers require AS9100 certification, and medical device manufacturers require ISO 13485 compliance. Suppliers should maintain industry-specific certification.

Test requirements vary by application. Tensile test verifies strength, confirms toughness in impact test, and evaluates chemical resistance in corrosion test. Each piece needs documentation linking back to the original ingot. Request a complete mill test report when purchasing titanium products.

Selecting a Titanium Manufacturing Partner

Experience is important when choosing a manufacturer. How long is the production history of titanium? Which industries do you supply? Aerospace projects require manufacturers with relevant experience and certification. Production capacity determines which products can be manufactured. Some specialize in sheet processing, while others focus on forging parts.

Quality systems show consistent production efforts. ISO certification is a minimum requirement and industry-specific authentication increases reliability. Technical support is useful for material selection and design. Good manufacturers have metallurgical engineers and engineers who can propose appropriate grades and product forms. The supply chain depends on reliable shipping, so check the delivery performance.

Conclusion

In titanium manufacturing spongy raw materials are converted into various products in a specific process. Rolling, forging for rods, extrusion or welding for pipe materials, wire drawing for wires, ring rolling is used for rings. By understanding these manufacturing methods, it is possible to select products suitable for the application and verify the capabilities of the supplier.

FAQs

1. What is the difference between hot rolled titanium plate and cold rolled titanium plate?

The hot rolled titanium plate is molded at 900°C or more, and the surface finish is rough although the cost is low. A cold rolling plate is molded at room temperature, the surface is smooth and the tolerance is strict. Cold rolling plates are required for medical devices, but hot rolling plates are selected for industrial applications to reduce costs.

2. Why is titanium manufacturing more expensive than steel manufacturing?

The Kroll process requires expensive magnesium and large amounts of energy. The machining of titanium is difficult, and the tool is consumed quickly, and vacuum melt is effective in preventing pollution, but additional cost is incurred.

3. Is the seamless titanium tube and welded titanium tube compatible?

Not necessarily. Seamless tubes withstand high pressure but are expensive. Welded tubes achieve low cost in low pressure applications. Determine the pipe type with optimum pressure resistance performance of the application.

4. How many times should titanium be melted applications?

Aerospace titanium products require double or triple VAR melting. A minimum of double VAR is required for civil aircraft parts, and triple VAR is generally specified for military parts to improve reliability.

5. Which titanium grade should I choose for chemical processing equipment?

Grade 2 commercial pure titanium supports most chemical treatments. Grade 7 improves acid resistance by adding palladium. Before grading, a chemical engineer must check the process conditions.

6. How to check the quality of titanium products for new suppliers?

Request a mill test report and verify ASTM, AS9100, or ISO certification. Request a sample to test independently, visit the facility and visit the titanium manufacturing process directly.

7. What thickness tolerances can be achieved in titanium tube manufacturing?

The seamless extrusion tube maintains a tolerance of ± 10% and the cold drawing seamless tube achieves ± 5% or more. Because tighter tolerances are costly, specify only the range required for the application.