Grade 4 Pure Titanium | UNS R50700 | JIS Class 4 | DIN 3.7065 (Ti4) Supplier
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
1. Grade 4 Pure Titanium Overview
Grade 4 Pure Titanium (Ti4) is the highest-strength commercially pure titanium grade, offering the maximum mechanical strength achievable without alloying elements. By increasing oxygen and iron content within controlled limits, Grade 4 titanium delivers exceptional strength, excellent corrosion resistance, and outstanding fatigue performance, making it ideal for high-load, pressure-bearing, and structurally demanding applications.
Unlike titanium alloys such as Ti-6Al-4V, Grade 4 titanium maintains the inherent purity, corrosion stability, and biocompatibility of commercially pure titanium while providing significantly higher tensile and yield strength than Grades 1–3.
As a trusted Grade 4 titanium supplier, Huaxiao-Alloy provides UNS R50700 / JIS Class 4 / DIN 3.7065 (Ti4) titanium materials in full specifications, strictly manufactured in accordance with ASTM, ASME, EN, DIN, ISO, and JIS standards, serving global customers in chemical processing, marine engineering, aerospace, medical, and power industries.
2. Equivalent Standards & Designations
Grade 4 titanium is fully standardized and globally accepted across engineering codes.
| Standard System | Designation |
|---|---|
| ASTM | Grade 4 |
| UNS | R50700 |
| JIS | Class 4 |
| DIN / EN | 3.7065 (Ti4) |
| ISO | ISO 5832-2 Grade 4 |
| GB (China) | TA4 |
➡️ These equivalencies ensure Grade 4 titanium can be used worldwide without requalification or redesign.
3. Chemical Composition of Grade 4 Pure Titanium
Grade 4 titanium is classified as commercially pure titanium, with the highest allowable oxygen and iron content among CP grades to maximize strength.
| Element | Maximum Content (%) |
|---|---|
| Titanium (Ti) | Balance |
| Oxygen (O) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.50 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.015 |
Composition Insight
Oxygen is the primary strengthening element
Iron further enhances tensile strength
No intentional alloying elements → maintains purity and corrosion resistance
4. Mechanical Properties of Grade 4 Titanium
4.1 Mechanical Properties at Room Temperature
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2%) | ≥ 485 MPa |
| Elongation | ≥ 15% |
| Hardness | ≤ 260 HB |
| Density | 4.51 g/cm³ |
| Elastic Modulus | ~105 GPa |
4.2 Strength Positioning
Strongest among all CP titanium grades
Comparable yield strength to some low-alloy steels
Enables weight reduction with higher load capacity
5. Key Features & Advantages of Grade 4 Titanium
5.1 Highest Strength Among Commercially Pure Titanium
Grade 4 allows:
Thinner wall pressure components
Reduced material weight
Higher safety margins in structural applications
5.2 Excellent Corrosion Resistance
Outstanding resistance to seawater and marine atmospheres
Excellent stability in chloride environments
Resistant to pitting, crevice corrosion, and SCC
5.3 Outstanding Fatigue Performance
Superior fatigue strength compared to Ti1–Ti3
Ideal for cyclic load applications
Maintains integrity under vibration and thermal cycling
5.4 Biocompatible & Non-Magnetic
Biologically inert
Non-magnetic and non-toxic
Suitable for medical and clean-energy systems
6. Available Product Forms from Huaxiao-Alloy
Huaxiao-Alloy supplies Grade 4 Pure Titanium in complete mill and fabricated forms.
6.1 Titanium Sheets & Plates
Standard: ASTM B265
Thickness: 1.0 mm – 80 mm
Surface: Pickled, annealed, polished
6.2 Titanium Pipes & Tubes
Standards: ASTM B338 / ASTM B861
Seamless & welded
OD range: 6 mm – 219 mm
6.3 Titanium Bars & Rods
Standard: ASTM B348
Round, square, hex
Hot-rolled or cold-drawn
6.4 Titanium Wire
Diameter: 0.3 mm – 6.0 mm
Annealed or cold-worked
6.5 Forgings & Machined Components
Flanges, rings, fasteners
Custom-machined parts to drawings
7. Typical Applications of Grade 4 Pure Titanium
7.1 Chemical Processing Industry
Pressure vessels
Heat exchanger plates
Reactors and piping systems
7.2 Marine & Offshore Engineering
Seawater piping
Offshore platform structures
Desalination plants
7.3 Power & Energy Sector
Condenser tubing
Cooling systems
Nuclear auxiliary equipment
7.4 Aerospace & Industrial Engineering
Structural brackets
Aircraft fasteners
High-strength lightweight components
7.5 Medical & Biomedical Applications
Dental implants
Bone fixation devices
Surgical components
8. Corrosion Resistance Performance
Grade 4 titanium forms a dense, self-healing TiO₂ passive film, ensuring long-term corrosion protection.
✔ Resistant to:
Seawater (even high-flow)
Chloride solutions
Nitric acid
Organic acids
❌ Limited resistance to:
Strong reducing acids without inhibitors
Dry chlorine at high temperatures
9. Fabrication, Machining & Welding Guide
9.1 Forming
Lower ductility than Ti1–Ti3
Higher forming force required
Hot forming recommended for complex shapes
9.2 Machining
Low cutting speed essential
Sharp carbide tools recommended
High-pressure coolant required
9.3 Welding
Excellent weldability with proper shielding
TIG welding preferred
Strict cleanliness required
10. Heat Resistance & Thermal Properties
Maximum continuous service temperature: ~350°C
Low thermal conductivity
Excellent dimensional stability
Suitable for thermal cycling environments
11. Comparison: Grade 2 vs Grade 3 vs Grade 4 Titanium
| Property | Grade 2 | Grade 3 | Grade 4 |
|---|---|---|---|
| Tensile Strength | Medium | High | Very High |
| Ductility | Excellent | Good | Moderate |
| Corrosion Resistance | Excellent | Excellent | Excellent |
| Typical Use | Heat exchangers | Pressure parts | Load-bearing |
12. Quality Assurance & Certifications
All Grade 4 titanium supplied by Huaxiao-Alloy includes:
EN 10204 3.1 / 3.2 Mill Test Certificates
Chemical & mechanical testing
Dimensional inspection
UT / Eddy current testing (if required)
ISO 9001 quality system
Full heat number traceability
13. Why Choose Huaxiao-Alloy as Your Grade 4 Titanium Supplier?
✅ 15+ years titanium export experience
✅ Strong production base in Baoji, Shanghai, Wuxi
✅ Stable bulk supply capability
✅ Competitive global pricing
✅ OEM & custom machining support
✅ Professional engineering consultation
Its combination of high strength and excellent corrosion resistance without alloying elements.
Yes, it is the strongest commercially pure titanium grade.
Yes, with proper inert gas shielding.
Absolutely, it performs exceptionally well in marine environments.
Yes, full OEM and custom machining services are available.
TItanium Products
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