A Selection Guide To Titanium Grade 2

Gr2 (CP Ti)  has become the most widely used in high-end fields due to its balanced performance, excellent processing adaptability, and cost-effectiveness.There are numerous titanium alloy grades, how to accurately determine whether Gr2 meets the requirements and avoid falling into selection misunderstandings?

 

 

Corrosion Resistance: It can forms a dense, self-healing titanium oxide film on the surface. It has better corrosion resistance , widely applying in marine engineering (pipes, connectors) and chemical engineering (reactor liners, transmission pipelines).

 

Mechanical Properties: Tensile strength is 370-480MPa. The yield strength is 275MPa, and elongation is 20%-25%. Though its strength is lower than that of Gr5, it has outstanding toughness. It is suitable for medical dental implant abutments (bearing occlusal force + plastic processing) and heat exchangers (resistance to thermal stress cracking).

 

Biocompatibility and Thermal Conductivity: it contains no harmful elements and has excellent biocompatibility and it is suitable for orthopedic implants and dental restorations. With a thermal conductivity of 16.3W/(m·K), it can meet the thermal insulation needs of aerospace and other fields.

 

 

1. Forging Process

The forging temperature of Gr2 is 800-950℃.It requires temperature control to prevent grain coarsening. Forging can refine grains, improve density, and enhance the uniformity of mechanical properties, making it suitable for complex forgings such as valve cores. After forging, stress relief annealing is performed by holding at 600-700℃ followed by air cooling to eliminate stress and restore plasticity.

 

2. Welding Process

Gr2 has good weldability and can be welded using methods such as TIG and MIG. Welding requires the use of argon gas with a purity of ≥99.99% for protection to prevent titanium from reacting at high temperatures to form brittle compounds. Stress relief annealing is recommended after welding to reduce residual stress and prevent cracking.

 

3. Cutting and Forming Processes

Gr2 has moderate cutting difficulty. Due to its poor thermal conductivity, cemented carbide tools should be selected, along with low cutting speed, large feed rate, and sufficient cooling fluid. Its high plasticity makes it suitable for cold working such as stamping and bending without complex preheating, reducing costs.

 

Gr1,Gr2,Gr3,Gr4,Gr5,Gr7,Titanium Bars Display

 

 

Gr5 (Ti-6Al-4V), as the most widely used titanium alloy, has much higher strength than Gr2 and is often used in high-end fields such as aerospace. However, in many scenarios, the unique advantages of Gr2 make it a better choice.

 

Comparison	Gr2 (CP Ti)	Gr5 (Ti-6Al-4V)
Cost Advantage	Higher cost-effectiveness, material cost is 1/2~2/3 of Gr5, significantly improving product market competitiveness	Contains aluminum and vanadium alloying elements, complex smelting and processing processes, cost is 1.5~2 times that of Gr2
Processing Difficulty	Low strength and high plasticity, simple cutting/welding/cold forming processes; long tool life, low production scrap rate and processing loss	High strength and hardness, severe tool wear during cutting, strict control of welding parameters, preheating required for cold forming, long processing cycle and high cost
Corrosion Resistance and Biocompatibility	1. More stable in media such as dilute sulfuric acid and wet chlorine; 2. Pure titanium composition, reliable biocompatibility	1. Good corrosion resistance, but alloying elements may reduce corrosion resistance in specific environments; 2. Contains vanadium element, which may have potential impacts on some human bodies
Low-Temperature Performance	No significant decrease in plasticity and toughness at liquid nitrogen temperature (-196℃), stable mechanical properties	May experience increased brittleness in low-temperature environments
Applicable Scenarios	Chemical pipelines, civil medical devices, medical implants (dental implants, small orthopedic implants), low-temperature storage equipment, refrigeration engineering	Industrial structural parts requiring high strength, aerospace components, heavy-duty mechanical parts, etc.

 

 

Blindly Pursuing High Strength: In scenarios that do not require extremely high strength (such as chemical vessels and food processing 1.equipment), the strength of Gr2 is sufficient. Choosing high-strength grades such as Gr5 will increase costs, raise processing difficulty, and cause waste.

 

2.Ignoring the Matching Between Processing and Materials: Gr5 has poor cold forming performance, and selecting it for complex stamping and welded parts is prone to cracking. Gr2 has good plasticity, is suitable for various cold processing and welding processes, and is more suitable for complex processing needs.

 

3.Recognize Gr2 as "All-Purpose" in Corrosion Resistance: Gr2 is only suitable for conventional corrosive environments and cannot be used in highly corrosive scenarios,like concentrated nitric acid and hydrofluoric acid. For harsh environments, special corrosion-resistant grades such as Gr7 and Gr12 should be selected.

 

4.Neglecting the Balance Between Cost and Performance: For the cost,Gr5 is much higher than Gr2. Selection should balance requirements and cost-effectiveness. In scenarios such as civil medical devices, the performance and cost advantages of Gr2 are sufficient to meet needs, and there is no need to choose high-priced grades.