ASTM F67 / F136 Certified Titanium Material for Orthopedic & Dental Implants And Surgical Devices High-precision CP ...
View DetailsTitanium Grade 4
The strongest commercially pure titanium grade, offering maximum strength among unalloyed variants while retaining good corrosion resistance and weldability.
Product Overview
Bokang's Titanium Grade 4 is manufactured using advanced vacuum arc remelting technology, ensuring exceptional purity and consistent mechanical properties.
Grade 4 titanium represents the highest strength level within the family of commercially pure (CP) titanium grades defined by ASTM standards. Its enhanced mechanical properties are achieved through controlled increases in interstitial element content, particularly oxygen and iron, within specified limits. This results in tensile strength approximately 50% higher than Grade 1, while still maintaining the essential characteristics of pure titanium.
The alloy demonstrates excellent corrosion resistance equivalent to other CP grades, forming a stable, self-repairing oxide layer. However, its increased strength comes with a corresponding reduction in ductility and formability compared to Grades 1 and 2. Grade 4 is often selected for applications where the corrosion resistance of pure titanium is required, but where higher design stresses, pressure containment, or wear resistance are necessary. It finds particular utility in pressure vessels, orthopedic implant components, and marine hardware subjected to significant static loads.
Technical Support & Documentation
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View DetailsTechnical Specifications
Detailed specifications for our Titanium Grade 4
| Common Designations | CP Ti Grade 4, UNS R50700, 3.7065 |
| Composition (Main Elements) | Ti (min 99.0%), O (max 0.40%), Fe (max 0.50%), N (max 0.05%), C (max 0.08%), H (max 0.015%) |
| Mechanical Properties (Typical Annealed) | Tensile Strength: 550 MPa min, Yield Strength: 483 MPa min, Elongation: 15% min |
| Density | 4.51 g/cm³ |
| Form Availability | Plate, Bar, Fasteners, Wire, Pipe, Forgings |
| Key Standards | ASTM B265 (Sheet/Plate), ASTM B348 (Bar), ASTM F67 (Medical Implants) |
Key Advantages of Bokang Titanium Grade 4
Discover why our titanium wire stands out in the industry
Highest CP Ti Strength
Provides the maximum yield and tensile strength among commercially pure grades, allowing for thinner cross-sections or higher pressure ratings in corrosive service.
Superior Abrasion & Galling Resistance
The increased hardness compared to lower CP grades offers better performance in applications involving sliding contact or particle erosion.
Improved High-Temperature Strength Retention
Maintains a higher proportion of its room-temperature strength at elevated temperatures (up to ~300°C) compared to Grades 1-3.
Material Comparison
Titanium Grade 4 vs. Competitive Alternatives
| Feature | Grade 4 Titanium | Grade 2 Titanium | Duplex Stainless Steel 2205 |
|---|---|---|---|
| Strength Level | High (for CP Ti) | Medium | Very High |
| Corrosion in Hot Chlorides | Excellent (No Stress Corrosion Cracking) | Excellent | Good (Resistant to SCC) |
| Fabrication (Cold Bending) | Moderate (Larger bend radii required) | Good | Fair |
| Relative Cost (Material) | Higher than Gr2 | Benchmark | Lower than Ti |
| Typical Use Case | High-strength fasteners, Pressure hulls | General piping, Heat exchangers | Chemical processing piping |
Applications
Titanium Grade 4 applications across various industries
Pressure Vessels & Piping
- High-pressure vessels and reactors for the chemical and pharmaceutical industries.
- Thick-walled tubing and piping systems for corrosive service at elevated pressures.
- Compressed gas cylinders for specialty gases.
Marine Hardware
- Submarine hull penetrators and high-strength fasteners.
- Propeller shafts, stern tubes, and rudder stocks for high-performance vessels.
- Heavy-duty fittings and cleats for offshore platforms.
Medical Implants
- Bone screws, dental implant abutments, and trauma plates requiring higher strength.
- Components for external fixation devices.
- Non-articulating parts of joint replacement systems.
Material Selection Guide
How to choose the right titanium wire for your application
1
Assess Strength vs. Formability Trade-off
Select Grade 4 when the design requires the highest possible strength from a CP titanium grade, and where moderate reductions in ductility and cold formability are acceptable.
2
Evaluate Pressure or Load Requirements
For pressure-containing equipment, Grade 4's higher yield strength allows for higher design stresses per ASME code, potentially reducing wall thickness compared to Grade 2.
3
Consider Wear and Galling Potential
In applications with threaded connections or sliding surfaces, Grade 4's higher hardness provides better resistance to galling and adhesive wear than softer CP grades.
4
Review Welding and Post-Weld Requirements
While weldable, Grade 4 may exhibit slightly lower weld zone ductility. Evaluate if post-weld heat treatment is needed to restore properties in critical applications.
Production Process & Quality Control
Our rigorous manufacturing process ensures consistent quality
Raw Material Selection with Higher Interstitials
Titanium sponge and revert with chemistry targeting the higher oxygen and iron limits of Grade 4 is selected and blended.
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Consumable Electrode Preparation
Material is compacted into electrodes, with precise control to achieve the required interstitial element levels for strength.
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Vacuum Arc Remelting (VAR)
The electrode is melted to form a homogeneous ingot, with chemistry verified to ensure it falls within Grade 4's specified range.
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Hot Forging & Rolling
The ingot is forged and hot-rolled at temperatures that refine the grain structure while maintaining the strength-imparting interstitial solid solution.
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Controlled Cooling & Annealing
After hot working, controlled cooling rates and final annealing cycles are used to achieve the optimal balance of strength and ductility specified for annealed Grade 4.
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Testing & Certification for Strength
Rigorous tensile testing ensures minimum strength requirements are met. Material is certified to ASTM B265/B348 or the more stringent ASTM F67 for medical use.
Frequently Asked Questions
Common questions about pure titanium wire
Choose Grade 4 when you require the superior corrosion resistance and fabricability of commercially pure titanium, but need higher strength than Grades 1-3 can provide. Choose Ti-6Al-4V when strength is the paramount concern and you need roughly double the yield strength of Grade 4, accepting the alloy's higher cost, more difficult machining, and slightly different corrosion behavior in some environments.
Not significantly in most environments. The passive oxide film's stability is the primary corrosion barrier. While higher iron content could theoretically influence behavior in very specific reducing acids, for the vast majority of applications (seawater, oxidizing media), Grade 4 exhibits corrosion resistance equivalent to other CP grades. Its performance is still far superior to most stainless steels in chloride environments.
Yes, but with consideration. Grade 4 retains good toughness at cryogenic temperatures. However, its lower ductility compared to Grades 1 and 2 means its impact toughness at very low temperatures (e.g., liquid helium) may be slightly lower. For critical cryogenic applications, Grade 1 or 2 are often preferred for their superior ductility.
Yes, Grade 4 is commonly used for high-strength titanium fasteners like bolts, screws, and nuts. However, its higher strength requires more force for cold heading compared to Grade 2. Tool design and selection are critical to manage the higher work-hardening rate and prevent tool wear or failure. Intermediate annealing may be necessary for complex multi-blow heading operations.
Grade 4 is weldable using standard TIG/GTAW processes with matching ERTi-4 filler. The main difference is that the weld and heat-affected zone (HAZ) in Grade 4 may exhibit lower ductility due to the higher interstitial content. For critical applications, using a lower-strength filler metal (like ERTi-2) can improve weld metal ductility, though it creates an undermatched joint. Proper shielding and cleanliness remain paramount.
Why Choose Bokang Titanium?
18+ years of experience in high-quality titanium materials
18+
Years Experience
28+
Patents & Certifications
200+
Skilled Employees
ISO 13485:2016
Medical Device Certification
Our Commitment to Quality
Changzhou Bokang Special Material Technology Co., Ltd. is Wholesale Titanium Grade 4 Manufacturers and Custom Titanium Grade 4 Suppliers. At Bokang Titanium, we adhere to the strictest quality control protocols throughout our manufacturing process. Every batch of pure titanium wire undergoes rigorous testing including dimensional verification, mechanical property testing, surface quality inspection, and chemical analysis to ensure compliance with international standards.
Our quality management system is certified to ISO 9001:2015 and ISO 13485:2016 for medical device applications, ensuring full traceability from raw material to finished product. We maintain comprehensive documentation including material certifications, test reports, and process validation records.
With 18+ years of experience in titanium material production, we have developed specialized expertise in medical-grade, aerospace-grade, and industrial-grade titanium alloys. Our products are trusted by leading medical device manufacturers, aerospace companies, and industrial clients worldwide. We offer OEM/ODM Titanium Grade 4 for sale.