Titanium Grade 2 Chemical Composition, Mechanical Properties and Corrosion Resistance
Titanium Grade 2 Titanium Grade 2 is a commercially pure titanium grade widely considered for industrial applications requiring corrosion resistance, moderate strength and good formability. Identified by UNS R50400, this material is used in selected chemical processing, marine, heat exchanger and engineering applications.
Understanding the Titanium Grade 2 chemical composition is important when evaluating its mechanical properties, corrosion behaviour and suitability for demanding operating environments.
For engineers, manufacturers and procurement professionals, reviewing the material composition alongside the applicable product specification helps ensure the correct grade is selected for the intended application.
What Is Titanium Grade 2?
Titanium Grade 2 belongs to the commercially pure titanium family. It is not strengthened through the same alloying additions used in titanium alloys such as Grade 5.
Its engineering characteristics make it useful where a combination of corrosion resistance, formability and moderate mechanical strength is required.
Common identification details include:
- Material: Commercially Pure Titanium
- Grade: Grade 2
- UNS designation: R50400
- Material family: Unalloyed titanium
- Common product forms: Bars, billets, sheets, plates and other specified forms
The exact product form and supply condition should be confirmed against the relevant material standard.
Titanium Grade 2 Chemical Composition
Titanium Grade 2 consists primarily of titanium, with controlled limits for oxygen, iron, carbon, nitrogen and hydrogen.
These elements influence the material’s mechanical and physical characteristics.
| Element | Typical specification limit or requirement |
|---|---|
| Titanium | Balance |
| Oxygen | Maximum 0.25% |
| Iron | Maximum 0.30% |
| Carbon | Maximum 0.08% |
| Nitrogen | Maximum 0.03% |
| Hydrogen | Maximum 0.015% |
Note: These are commonly referenced maximum limits for Grade 2 under ASTM B348. Confirm the applicable product standard and revision before using the values for acceptance or inspection. The material test certificate should be used to verify the actual heat analysis.
Why Does Chemical Composition Matter?
The controlled composition of commercially pure titanium influences its strength, ductility and corrosion performance.
Oxygen: Oxygen is an important strength-affecting element in commercially pure titanium. Its permitted level must be controlled.
Iron: Iron is controlled as an impurity and can influence material characteristics.
Carbon and nitrogen: These elements have specified limits because excessive amounts can affect material properties.
Hydrogen: Hydrogen content is controlled because excessive hydrogen can negatively affect titanium’s performance.
Titanium: The balance of the composition provides the fundamental characteristics of commercially pure titanium.
Titanium Grade 2 Mechanical Properties
Titanium Grade 2 offers a balance of mechanical strength and ductility. Its actual mechanical properties depend on product form, thickness or diameter, manufacturing route and supplied condition.
Commonly referenced minimum tensile requirements under ASTM B348 for Grade 2 include:
| Mechanical property | Common minimum requirement |
|---|---|
| Tensile strength | 345 MPa |
| Yield strength (0.2% offset) | 275 MPa |
| Elongation | 20% |
Important: These values are reference minimums commonly associated with ASTM B348 Grade 2 bar requirements. Requirements can vary by product form, dimensions and specification revision. Always verify the applicable standard and material test certificate.
1. Tensile Strength
Tensile strength describes the maximum tensile stress a material can withstand before fracture during a tensile test.
This property is important when designing components subjected to pulling forces or other tensile loading.
2. Yield Strength
Yield strength indicates the stress at which permanent deformation begins under the specified test method.
Engineers use this value when evaluating the structural performance of components.
3. Elongation
Elongation measures the material’s deformation during a tensile test before fracture.
It provides an indication of ductility and helps engineers assess forming and deformation behaviour.
4. Hardness
Hardness is another property that may be specified or measured during material inspection. The required hardness limits should be taken from the applicable specification or purchase order rather than assumed from generic reference data.
Titanium Grade 2 Corrosion Resistance
One of the key reasons Titanium Grade 2 is considered for industrial applications is its corrosion resistance.
When exposed to oxygen-containing environments, titanium forms a stable, protective oxide film on its surface. This passive film contributes to its resistance to corrosion in many service conditions.
1. Resistance in Marine Environments
Titanium Grade 2 is considered for selected marine and seawater applications.
Its corrosion behaviour can be advantageous in many seawater environments. However, temperature, flow conditions, crevices, deposits and other operating factors must be evaluated.
2. Resistance in Chemical Processing
Titanium Grade 2 is used in selected chemical processing applications where its compatibility with the process fluid has been established.
Chemical compatibility depends on:
- Chemical type
- Concentration
- Operating temperature
- Fluid composition
- Contaminants
- Exposure conditions
It should not be assumed that Grade 2 is resistant to every acid, alkali or chemical solution. Specialist corrosion data should be reviewed before selecting the material.
3. Resistance to General Corrosion
The protective oxide film helps titanium resist general corrosion in many environments.
However, the material’s performance should be assessed for the actual service conditions, including possible crevice corrosion, erosion, galvanic interactions and contamination.
Factors That Influence Titanium Grade 2 Performance
Even when the correct grade is selected, several factors can affect its performance during manufacturing and service.
Material condition: The supplied condition influences the properties available for a particular application.
Product dimensions: Mechanical requirements may differ depending on product form and dimensions.
Fabrication process: Welding, forming and machining require suitable procedures to preserve material quality.
Surface condition: Surface contamination and damage can affect corrosion behaviour.
Operating environment: Temperature, chemicals, pressure and mechanical loading all influence service suitability.
Material traceability: Correct grade identification and inspection documentation help confirm that the supplied material meets the purchase requirement.
Titanium Grade 2 Standards and Material Verification
Material standards establish requirements for composition, mechanical properties, testing and product dimensions.
Commonly referenced specifications include:
| Standard | General scope |
|---|---|
| ASTM B348/B348M | Titanium and titanium alloy bars and billets |
| ASTM B265 | Titanium and titanium alloy sheet, strip and plate |
| ASTM B338 | Titanium and titanium alloy tubes for condensers and heat exchangers |
The exact specification must match the grade and product form. Buyers should confirm the applicable revision and any additional project requirements.
For procurement and inspection, check:
- Grade designation: Titanium Grade 2
- UNS number: R50400
- Applicable product standard
- Chemical analysis
- Mechanical test results
- Material condition
- Heat number and traceability
- Required inspection documentation
Useful technical references:
Where Are Titanium Grade 2 Mechanical Properties Important?
Titanium Grade 2 is considered for applications where corrosion resistance and moderate mechanical strength are important together.
Potential applications include:
- Chemical processing equipment
- Marine engineering components
- Heat exchanger parts
- Pump and valve components
- Industrial machined parts
- Specialised fabrication assemblies
The material must be evaluated against the specific engineering design, operating conditions and applicable industry standards.
Sourcing Titanium Grade 2 from Manan Steel & Metals
Manan Steel & Metals, based in Mumbai, India, deals in specialty metals and stainless steel products for industrial and engineering requirements.
When enquiring about Titanium Grade 2, buyers should specify:
- Grade: Titanium Grade 2 / UNS R50400
- Required product form
- Diameter, thickness or dimensions
- Required length
- Quantity
- Applicable ASTM or project specification
- Material condition
- Material certificate and inspection requirements
Explore Manan Steel & Metals and its Round Bar Products page.
For product enquiries and quotations, visit the Contact Us page.
Frequently Asked Questions About Titanium Grade 2 Properties
1. What is the chemical composition of Titanium Grade 2?
Titanium Grade 2 consists primarily of titanium, with controlled limits for oxygen, iron, carbon, nitrogen and hydrogen. The applicable ASTM specification defines the permitted composition limits.
2. What is the UNS number of Titanium Grade 2?
The UNS designation for Titanium Grade 2 is R50400.
3. What is the tensile strength of Titanium Grade 2?
A commonly referenced minimum tensile strength for Grade 2 under ASTM B348 bar requirements is 345 MPa. The exact requirement should be checked against the applicable product form and specification revision.
4. Does Titanium Grade 2 have good corrosion resistance?
Yes. It forms a protective oxide film that contributes to corrosion resistance in many environments. Suitability depends on the chemicals, temperature and operating conditions.
5. Is Titanium Grade 2 suitable for seawater applications?
It is considered for many seawater applications, but the actual service environment, component design and operating conditions must be evaluated.
6. Which ASTM standard is used for Titanium Grade 2 bars?
ASTM B348/B348M is a commonly referenced specification for titanium and titanium alloy bars and billets. Confirm the exact requirements for the ordered product.
Conclusion
Titanium Grade 2 (UNS R50400) is a commercially pure titanium grade valued for its combination of corrosion resistance, moderate strength and formability.
Understanding its chemical composition and mechanical properties helps engineers and procurement professionals evaluate the material for chemical processing, marine, heat exchanger and industrial engineering applications.
Before purchasing, confirm the grade, product form, applicable standard, mechanical requirements and material documentation.
For Titanium Grade 2 material enquiries, contact Manan Steel & Metals with your required dimensions and quantity.