Grade 2 vs Grade 5 Titanium: Strength, Corrosion and Cost Comparison
Specification check before ordering
Grade 2 and Grade 5 are not interchangeable. First match the alloy to the product form and governing standard; then review mechanical, corrosion and fabrication requirements. In particular, ASTM B338-17(2026) does not list Grade 5. The table below has been corrected so a project instruction is not presented as extending that standard.
Technical correction checked 18 October 2026. Public product scopes: ASTM B338, ASTM B348, ASTM B265 and ASTM B381. These references do not replace the ordered standard or design approval.
Introduction
Grade 2 / UNS R50400 is commercially pure titanium, commonly considered where corrosion service and fabrication requirements favor it. Grade 5 / Ti-6Al-4V / UNS R56400 has a substantially higher mechanical-strength baseline. Neither is universally better: the product standard, condition, design loads, actual medium and manufacturing route determine the selection.
Both Grade 2 and Grade 5 titanium are widely used in industrial metal procurement, but they are not interchangeable. Grade 2 is a commercially pure titanium grade with excellent corrosion resistance and good ductility. Grade 5, also known as Ti-6Al-4V or UNS R56400, is an alpha-beta titanium alloy strengthened by aluminum and vanadium, offering much higher tensile strength and yield strength than Grade 2.
For material selection, compare chemistry, mechanical requirements, service medium and temperature, fabrication route, product form and the exact standard edition. Product test certificates can be provided. Define any additional inspection or documentation requirement for confirmation before ordering; an alloy name does not establish a certification or a delivery commitment.
What Are Grade 2 and Grade 5 Titanium?
Grade 2 titanium, also known as commercially pure titanium Grade 2 or UNS R50400, is one of the most widely used CP titanium grades. It offers a strong balance of corrosion resistance, moderate strength, good ductility, good weldability and reliable fabrication performance. It is commonly used for titanium pipe, titanium plate, titanium bar, titanium fittings, heat exchanger tubes, marine components and chemical processing equipment.
Grade 5 titanium, also known as Ti-6Al-4V, 6Al-4V titanium or UNS R56400, is the most widely used titanium alloy. It contains aluminum and vanadium, which provide much higher strength than commercially pure titanium grades. Grade 5 titanium is widely used in aerospace, medical devices, high-strength fasteners, precision machined parts, marine hardware, automotive components and high-performance industrial equipment.
Fast Buyer Recommendation
| Application Condition | Recommended Grade | Reason |
|---|---|---|
| Chemical processing equipment | Grade 2 Titanium | Excellent corrosion resistance, good weldability and suitable cost-performance balance |
| Aerospace and high-strength parts | Grade 5 Titanium | Higher strength baseline; fatigue performance requires component-specific validation |
| Welded tanks, heat exchangers and piping | Grade 2 Titanium | Easier welding and fabrication than Grade 5 in many industrial applications |
| High-strength fasteners, shafts and machined parts | Grade 5 Titanium | Much higher tensile and yield strength than Grade 2 |
| Cost-sensitive corrosion-resistant parts | Grade 2 Titanium | Usually more economical when Grade 5 strength is not required |
Chemical Composition Comparison
The main difference between Grade 2 and Grade 5 titanium comes from alloying elements. Grade 2 is commercially pure titanium with controlled oxygen, iron, carbon, nitrogen and hydrogen. Grade 5 contains aluminum and vanadium, which significantly increase strength and make it suitable for aerospace and high-load applications.
| Element | Grade 2 Titanium Typical Requirement | Grade 5 Titanium Typical Requirement | Material Selection Note |
|---|---|---|---|
| Titanium (Ti) | Balance | Balance | Base metal providing low density, corrosion resistance and biocompatibility |
| Aluminum (Al) | Not alloyed | 5.50 – 6.75% | Major strengthening element in Grade 5 Ti-6Al-4V |
| Vanadium (V) | Not alloyed | 3.50 – 4.50% | Improves beta phase stability and mechanical strength |
| Iron (Fe) | Max 0.30% | Max 0.40% | Controlled to maintain toughness, ductility and consistency |
| Oxygen (O) | Max 0.25% | Max 0.20% | Higher oxygen increases strength but may reduce ductility |
| Carbon (C) | Max 0.08% | Max 0.08% | Controlled interstitial element |
| Nitrogen (N) | Max 0.03% | Max 0.05% | Should be controlled for ductility and toughness |
| Hydrogen (H) | Max 0.015% | Max 0.015% | Strict control helps reduce hydrogen embrittlement risk |
Mechanical Properties of Grade 2 vs Grade 5 Titanium
Mechanical properties are the most important reason buyers compare Grade 2 vs Grade 5 titanium. Grade 2 provides moderate strength with excellent ductility and corrosion resistance. Grade 5 provides much higher tensile strength and yield strength, making it suitable for high-load and precision applications. However, Grade 5 is usually more difficult to form and machine than Grade 2.
| Property | Grade 2 Titanium | Grade 5 Titanium | Buyer Selection Note |
|---|---|---|---|
| Tensile Strength | Moderate, commonly around 345 MPa minimum depending on standard and product form | High, commonly around 895 MPa minimum depending on standard and condition | Choose Grade 5 when high mechanical strength is required |
| Yield Strength | Moderate, suitable for CP titanium equipment parts | Much higher than Grade 2 | Important for fasteners, shafts, brackets and load-bearing components |
| Elongation | Good ductility and formability | Lower ductility than Grade 2 | Choose Grade 2 for forming, bending and easier fabrication |
| Hardness | Lower | Higher | Grade 5 is better for high-strength machined parts but may increase machining difficulty |
| Weldability | Excellent | Weldable, but requires stricter process control | Grade 2 is generally preferred for welded chemical equipment |
| Density | Approx. 4.51 g/cm³ | Approx. 4.43 g/cm³ | Both materials are lightweight compared with stainless steel and nickel alloys |
Applicable Standards and Equivalent Grades
Choose the product specification before comparing trade names or national designations. ASTM B348 covers bars and billets; B265 covers strip, sheet and plate; B381 covers forgings. ASTM B338-17(2026) covers specified heat-exchanger tube grades and does not list Grade 5. A project requirement cannot by itself add a grade to a standard. Cross-standard names in the table are identification aids, not proof of full equivalence or automatic substitution.
| Item | Grade 2 Titanium | Grade 5 Titanium | Common Product Scope |
|---|---|---|---|
| UNS | R50400 | R56400 | General international material identification |
| Common Name | Commercially Pure Titanium Grade 2 | Ti-6Al-4V / 6Al-4V Titanium | Material comparison and purchase specification |
| ASTM Bar Standard | ASTM B348 Grade 2 | ASTM B348 Grade 5 | Bars and billets; finished forgings require their own applicable product specification |
| ASTM Plate / Sheet Standard | ASTM B265 Grade 2 | ASTM B265 Grade 5 | Titanium sheet, plate and strip |
| ASTM Tube Standard | ASTM B338 Grade 2 | Grade 5 is not listed in ASTM B338-17(2026); select a product-appropriate Grade 5 pipe/tube specification and confirm its scope | Titanium seamless and welded tubes |
| EN / W.Nr. | 3.7035 | 3.7165 | European drawings and equipment specifications |
| GB Grade | TA2 | TC4 | China-origin titanium supply and export documentation |
Quality Testing and Material Traceability
For either grade, agree the required material identity, marking and test information for the ordered product. Product test certificates can be provided. Any additional inspection method, coverage, acceptance criteria or independent inspection arrangement must be confirmed specifically; it is not included merely because it appears in a buyer checklist.
Certificate and Inspection Checklist
| Inspection / Document Item | What to Check | Why It Matters |
|---|---|---|
| Product test certificate | Grade, UNS number, standard, heat number, chemical composition, mechanical properties and size | Confirms batch-specific quality and supports project documentation |
| Heat Number Control | Heat number on material marking, label, packing list and MTC must match | Prevents mixed material delivery and supports traceability |
| PMI Testing | Verify titanium grade and alloying elements such as aluminum and vanadium in Grade 5 | Helps distinguish commercially pure Grade 2 from Ti-6Al-4V Grade 5 |
| UT Testing | Check internal soundness for bars, plates, forgings and critical parts | Important for aerospace, shafts, precision machining and high-reliability components |
| Dimensional Inspection | Diameter, thickness, width, length, straightness, flatness and tolerance | Ensures machining, assembly, welding and installation requirements are met |
| Surface Inspection | Check scratches, cracks, oxidation, pits, peeling marks, grinding marks and end condition | Important for precision machining, medical parts and visible components |
| Third-party Inspection | Independent inspection only if separately requested, technically defined and commercially confirmed | Provides additional confidence for export orders and engineering projects |
Comparison With Similar Titanium Materials
Grade 2 and Grade 5 are two of the most common titanium grades, but buyers may also compare them with Grade 1, Grade 3, Grade 4, Grade 7, Grade 9 and Grade 23. The correct grade should be selected according to corrosion environment, strength requirement, weldability, medical requirement, cost target and final product form.
| Material | Strength | Corrosion Resistance | Cost Level | Best-use Recommendation |
|---|---|---|---|---|
| Grade 1 Titanium | Low | Excellent | Moderate to high | Forming parts, chemical equipment and applications requiring maximum ductility |
| Grade 2 Titanium | Medium for commercially pure titanium | Excellent | Usually lower than Grade 5 in many product forms | Chemical processing, marine parts, heat exchangers, pipes, plates and welded equipment |
| Grade 5 Ti-6Al-4V | High | Good | Higher than commercially pure titanium in many cases | Aerospace, fasteners, shafts, medical-related parts and high-strength machined components |
| Grade 7 Titanium | Similar to Grade 2 range depending on condition | Excellent in selected reducing acid environments | High | Chemical processing where Grade 2 may not provide enough corrosion resistance |
| Grade 9 Ti-3Al-2.5V | Medium to high | Good | Moderate to high | Tubing, hydraulic systems, lightweight structures and sports components |
| Grade 23 Ti-6Al-4V ELI | High | Good | High | Medical implants and high-reliability components requiring ELI control |
Industrial Applications of Grade 2 and Grade 5 Titanium
Both Grade 2 and Grade 5 titanium are used in industrial projects, but their application focus is different. Grade 2 is usually selected for corrosion resistance, fabrication and welded process equipment. Grade 5 is selected for high-strength, lightweight, precision and fatigue-resistant applications.
| Application Scenario | Recommended Grade | Typical Products | Selection Reason |
|---|---|---|---|
| Chemical Processing | Grade 2 Titanium | Pipes, plates, bars, fittings, heat exchanger parts and tanks | Excellent corrosion resistance and good weldability |
| Aerospace | Grade 5 Titanium | Fasteners, brackets, shafts, forged parts, rings and machined components | High strength-to-weight ratio and fatigue resistance |
| Marine Engineering | Grade 2 or Grade 5 depending on load | Marine hardware, shafts, bolts, fittings, pump parts and support components | Grade 2 for corrosion; Grade 5 for higher strength marine components |
| Medical and Dental | Grade 2, Grade 5 or Grade 23 depending on standard | Instruments, rods, screws, plates and implant-related components | Biocompatibility, corrosion resistance and strength; medical implants may require Grade 23 ELI |
| Industrial Machinery | Grade 2 or Grade 5 | Shafts, blocks, connectors, support rods, fasteners and CNC machined parts | Select Grade 2 for corrosion and fabrication; select Grade 5 for load-bearing strength |
| Heat Exchangers | Grade 2 Titanium | Tubes, tube sheets, plates, baffles and corrosion-resistant components | Excellent corrosion resistance and good fabrication performance |
Why Choose Grade 2 or Grade 5 Titanium?
The right titanium grade depends on whether the project prioritizes corrosion resistance, weldability, formability, mechanical strength, fatigue resistance or cost. Grade 2 is the practical industrial titanium grade for corrosion-resistant equipment. Grade 5 is the high-strength titanium alloy for lightweight load-bearing parts.
Corrosion, Strength and Cost Comparison
| Selection Factor | Grade 2 Titanium | Grade 5 Titanium | Buyer Decision |
|---|---|---|---|
| Corrosion Resistance | Excellent in many chemical, marine and industrial environments | Good, but generally selected more for strength than maximum corrosion resistance | Choose Grade 2 when corrosion resistance and fabrication are the main priorities |
| Strength | Moderate | Much higher | Choose Grade 5 when strength-to-weight ratio is critical |
| Weldability | Excellent | Weldable with stricter control | Choose Grade 2 for welded process equipment and heat exchangers |
| Machinability | Easier than Grade 5 in many cases | More difficult due to higher strength and hardness | Confirm machining allowance, surface finish and tooling plan for Grade 5 parts |
| Cost | Usually more economical than Grade 5 | Usually higher because of alloying elements and processing requirements | Choose Grade 2 if Grade 5 strength is not technically required |
Common Buyer Mistakes
A common mistake is selecting Grade 5 only because it is stronger, even when Grade 2 already provides sufficient strength and better fabrication performance for corrosion-resistant equipment. Another mistake is selecting Grade 2 for high-strength aerospace or fastener applications where Grade 5 is technically required. Buyers should also avoid accepting titanium products without clear grade, UNS number, heat number, MTC, PMI testing and applicable standard.
Surface Finish, Processing and Export Packaging
Grade 2 and Grade 5 titanium can be supplied with different surface finishes according to product form and application. Common bar finishes include black surface, pickled surface, peeled surface, turned surface, ground surface and polished surface. Plates and sheets may be supplied hot rolled, cold rolled, pickled, sandblasted or polished. Tubes may be supplied pickled, bright, polished or precision finished.
Processing services may include cutting, sawing, peeling, turning, grinding, polishing, straightening, drilling, CNC machining and custom length cutting. For export delivery, titanium products should be packed with waterproof wrapping, plastic protection, wooden cases, wooden pallets or strong bundles. Clear labels should show grade, standard, heat number, size, quantity and destination information.
Related Titanium Products
SAKY ALLOY supplies Grade 2 and Grade 5 titanium in different product forms for chemical processing, aerospace, marine engineering, medical equipment, heat exchangers, oil and gas, industrial machinery and precision machining applications. Buyers can select the correct product form according to drawing requirements and project standards.
| Product | Common Grades | Typical Use |
|---|---|---|
| Titanium Bar | Grade 1, Grade 2, Grade 5, Grade 7, Grade 9, Grade 23 | Shafts, fasteners, CNC parts, valve components, medical parts and aerospace components |
| Titanium Plate | Grade 1, Grade 2, Grade 5, Grade 7, Grade 12 | Chemical equipment, heat exchanger parts, marine plates and industrial structures |
| Titanium Pipe and Tube | Grade 1, Grade 2, Grade 7, Grade 9, Grade 12 | Heat exchangers, condensers, chemical piping, marine systems and process equipment |
| Titanium Wire | Grade 1, Grade 2, Grade 5, Grade 23 | Medical wire, welding wire, springs, mesh, fasteners and precision components |
| Titanium Forging | Grade 2, Grade 5, Grade 23 and project-specific grades | Forged rings, discs, blocks, shafts and high-strength custom components |
FAQ About Grade 2 vs Grade 5 Titanium
1. Which is better, Grade 2 or Grade 5 titanium?
Neither grade is universally better. Compare the required strength and fabrication behavior, then check actual corrosion-service data and the applicable product specification. Do not substitute one grade solely because it is stronger or commonly used in the same industry.
2. Is Grade 5 titanium stronger than Grade 2?
Yes. Grade 5 titanium is much stronger than Grade 2 because it contains aluminum and vanadium. It offers significantly higher tensile strength, yield strength and hardness, making it suitable for high-strength and high-performance applications.
3. Which grade has better corrosion resistance?
Corrosion selection needs the actual medium, concentration, temperature, aeration, contaminants and crevice conditions. Grade 2 is often considered for process equipment, but neither grade can be ranked universally by corrosion resistance. Confirm relevant service data and responsible engineering approval.
4. Can Grade 2 and Grade 5 titanium be welded?
Both grades can be welded, but Grade 2 is generally easier to weld and fabricate. Grade 5 can be welded with proper process control, shielding gas protection and qualified welding procedures. For welded tanks, pipes and heat exchangers, Grade 2 is commonly preferred.
5. Is Grade 5 titanium more expensive than Grade 2?
In many cases, Grade 5 titanium is more expensive than Grade 2 because it contains alloying elements and requires stricter production control. If the application does not require Grade 5 strength, Grade 2 may be more cost-effective.
6. Which titanium grade should be used for medical applications?
Do not select an implant material from this industrial grade comparison. Medical use requires the exact application-specific material standard, manufacturing controls and finished-device regulatory requirements. Grade 23 ELI is not a universal mandatory replacement for every implant alloy, and a grade designation alone is not medical approval.
7. What certificates should buyers request?
Product test certificates can be provided. State the information needed for the ordered product, such as grade, standard edition, lot identity and agreed test results. Additional inspection or a particular document type requires separate confirmation and must not be inferred from this overview.
8. What information is needed for a fast quotation?
A complete inquiry includes grade, product form, standard edition, dimensions, quantity, tolerance, surface, condition, required test information and packing. Example: Grade 5 / R56400 bar to the specified ASTM B348 edition, diameter 30 mm, length 3000 mm, peeled surface and the agreed dimensional tolerance. This is an RFQ example, not a stock or acceptance promise. Product test certificates can be provided.
Conclusion
Grade 2 and Grade 5 titanium are both important industrial titanium materials, but they serve different purposes. Grade 2 titanium is the better choice for corrosion resistance, weldability, formability and cost-effective chemical or marine equipment. Grade 5 titanium is the better choice for high strength, high fatigue resistance, aerospace components, precision machined parts, shafts and fasteners.
For procurement, confirm grade and UNS, product form, standard edition, dimensions, tolerance, condition, surface, quantity and required test information. Product test certificates can be provided. Agree additional tests or a specific document type before order acceptance.
Call To Action
Contact SAKY ALLOY with the required Grade 2 or Grade 5 product form and complete specification. Product test certificates can be provided. Dimensions, surface, processing and any additional inspection must be reviewed against the actual order; this overview is not a blanket certification or inspection-capability declaration.
Send your required grade, standard, product form, size, quantity, application environment and certificate requirements to our technical team. We can help you compare Grade 2 vs Grade 5 titanium, confirm the right specification, provide quotation and arrange suitable titanium supply solutions for your project.