Boze Titanium Manufacturing Center | CP Titanium Grade

ELI Grade 4 – Low Interstitial Titanium ELI Grade 4

Extra-Low Interstitial (ELI) Grade 4 titanium — a modified CP-Ti Grade 4 with controlled low oxygen, nitrogen, and carbon content for improved ductility, fracture toughness, and fatigue resistance in demanding aerospace and medical applications.

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Entity Definition

What is ELI Grade 4 Titanium?

ELI (Extra-Low Interstitial) Grade 4 is a modified version of standard CP-Ti Grade 4 with strictly controlled lower limits of interstitial elements — oxygen, nitrogen, carbon, and hydrogen. This controlled chemistry significantly improves ductility, fracture toughness, and fatigue properties while maintaining strength levels close to standard Grade 4.

Classification

Commercially Pure Titanium (Alpha Phase) — ELI Modification
UNS Number

UNS R50700 (modified)

Common Names

Grade 4 ELI CP-Ti Grade 4 ELI Extra-Low Interstitial Grade 4 ASTM F67 ELI Grade 4

Key Characteristics

  • Superior fracture toughness and fatigue resistance compared to standard Grade 4
  • Controlled low oxygen (≤0.15%) and nitrogen (≤0.03%) content
  • Enhanced ductility for improved formability and cold working
  • Excellent corrosion resistance — equivalent to standard CP grades
  • Preferred for critical implant applications requiring high reliability
Applicable Standards

Applicable Standards

ELI Grade 4 titanium conforms to the following international material standards:

ASTM F67 — Standard Specification for Unalloyed Titanium for Surgical Implant Applications
ISO 5832-2 — Implants for Surgery (ELI Grade)
ASTM B265 — Sheet, Strip, and Plate (when specified as ELI)
ASTM F136 (analogous ELI requirement approach)
Material Properties

Mechanical & Physical Properties

Typical room-temperature properties for ELI Grade 4 titanium (annealed condition):

Tensile Strength (min) 485 MPa (70 ksi)
Yield Strength 0.2% Offset (min) 380 MPa (55 ksi)
Elongation (min) 20%
Reduction of Area 35%
Fracture Toughness (KIC) > 80 MPa√m
Density 4.51 g/cm³ (0.163 lb/in³)
Elastic Modulus 105 GPa (15.2 × 10⁶ psi)
Melting Point 1,668°C (3,034°F)
Thermal Conductivity 17 W/(m·K)
Max Oxygen Content ≤ 0.15%
Processing Methods

Available Processing Methods

ELI Grade 4 titanium can be processed using the following manufacturing techniques:

Cold forming — Better than standard Grade 4 due to lower interstitial content
Hot forming — Recommended at 260–540°C (500–1,000°F)
CNC machining — Similar to standard Grade 4; requires sharp tools and adequate coolant
TIG welding — Good; ELI chemistry provides better weld ductility
Laser welding — Acceptable with inert gas shielding
Forging — At 870–980°C (1,600–1,800°F) with controlled cooling rate
Surface treatment — Anodizing, passivation, and polishing all applicable
Downstream Products

Typical Products & Components

ELI Grade 4 titanium is commonly fabricated into the following downstream products:

Orthopedic implants — trauma plates, bone screws, spinal fixation hardware
Dental implants and abutments
Surgical instruments requiring high toughness
Cryogenic components where low-temperature toughness is critical
Aerospace structural fittings requiring high reliability
High-performance marine hardware
Industries

Primary Industries

ELI Grade 4 titanium serves as a material of choice across these industries:

Medical — Orthopedic implants, dental implants, surgical instruments
Aerospace — Structural components requiring high fracture toughness
Cryogenic — Liquid gas storage and handling equipment
Defense — Military hardware requiring high reliability
Marine — Components subject to high cyclic loading
Alternative Materials

Alternative Materials

Depending on application requirements, ELI Grade 4 may be substituted by:

Standard Grade 4 (CP-Ti) — Lower cost but reduced ductility and toughness
Grade 23 (Ti-6Al-4V ELI) — Higher strength medical-grade alternative
Grade 5 (Ti-6Al-4V) — Higher strength but lower corrosion resistance in some environments
316LVM Stainless Steel — Lower cost but heavier and less biocompatible
Why Boze Titanium Manufacturing Center

Why Choose Us for This Grade

Boze Titanium Manufacturing Center is a medical-grade manufacturer of ELI Grade 4 components. Our ISO 13485 facility processes certified ASTM F67 ELI material with full traceability from certified mill sources.

Frequently Asked Questions

Common questions from engineers about this titanium grade and our precision machining capabilities.

What is ELI Grade 4 titanium?

ELI Grade 4 is a modified version of standard CP-Ti Grade 4 with strictly controlled lower limits of interstitial elements, delivering significantly improved ductility and fracture toughness.

What medical applications use ELI Grade 4?

ELI Grade 4 is preferred for trauma plates, bone screws, spinal fixation hardware, dental implants, and surgical instruments.

What certifications do you provide for ELI Grade 4?

Each order includes EN 10204 Type 3.1 MTRs per ASTM F67 ELI, CMM inspection, surface finish measurements, and passivation certification per ASTM F86.

Need ELI Grade 4 Components?

Our engineering team delivers precision-machined components in ELI Grade 4. Submit your RFQ for a competitive quote within 24–48 hours.

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Audience-first guidance

Guidance for the professionals who specify titanium

Role-specific answers and resources for engineers and buyers in this industry.

Design engineering Quality & compliance Procurement

Common questions from this audience

How do I choose the right titanium grade?

Selection depends on strength, corrosion resistance, formability and application — CP grades for corrosion, alpha-beta alloys like Ti-6Al-4V for strength, and ELI grades for medical.

Which titanium grade is best for medical implants?

Ti-6Al-4V ELI (Grade 23) per ASTM F136 is the most common implantable grade for its strength and biocompatibility.

What certifications accompany titanium material?

Mill test certificates (ASTM, AMS), EN 10204 3.1 reports and full lot traceability are provided with every shipment.

Related resources

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About Boze Titanium Manufacturing Center

One Metal. One Focus. Infinite Precision.

Founded in 2011 in Baoji's Titanium Valley, BOZE Metal is dedicated exclusively to titanium — from raw material to precision engineering. AS9100D, ISO 13485 & ISO 9001 certified with 500+ clients across Aerospace, Medical & Motorsport industries, we deliver end-to-end precision titanium CNC machining with full material traceability from source to component.

Boze Titanium Manufacturing Center is operated by Baoji Boze Metal Products Co., Ltd.

AS9100D ISO 13485 ISO 9001 500+ Clients 15+ Years OEM/ODM
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