Boze Titanium Manufacturing Center | CP Titanium Grade

Grade 4 – Commercially Pure Titanium Grade 4

Commercially Pure Titanium Grade 4 (UNS R50700) — the highest-strength CP titanium grade with maximum oxygen content for enhanced tensile properties. Provides the best strength-to-cost ratio among commercially pure grades for structural applications.

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Entity Definition

What is Grade 4 Titanium?

Grade 4 is the highest-strength grade in the commercially pure titanium family. Its elevated oxygen content (up to 0.40%) provides increased tensile and yield strength compared to Grades 1–3, while retaining the excellent corrosion resistance characteristic of unalloyed titanium. Grade 4 is often specified for applications requiring maximum strength within the CP series.

Classification

Commercially Pure Titanium (Alpha Phase)
UNS Number

UNS R50700

Common Names

CP-Ti Grade 4 UNS R50700 Ti Grade 4 ASTM B265 Grade 4

Key Characteristics

  • Highest strength among CP titanium grades
  • Excellent corrosion resistance in oxidizing and mild reducing environments
  • Good weldability with appropriate process controls
  • Moderate formability — less ductile than lower CP grades
  • Biocompatible — used in medical implant applications
Applicable Standards

Applicable Standards

Grade 4 titanium conforms to the following international material standards:

ASTM B265 — Sheet, Strip, and Plate
ASTM B348 — Bars and Billets
ASTM B381 — Forgings
ASTM F67 — Standard Specification for Unalloyed Titanium for Surgical Implant Applications
ISO 5832-2 — Implants for Surgery
AMS 4901 — Sheet, Strip, and Plate (Commercially Pure Titanium)
DIN 17850 — Titanium Grade 4
Material Properties

Mechanical & Physical Properties

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

Tensile Strength (min) 550 MPa (80 ksi)
Yield Strength 0.2% Offset (min) 485 MPa (70 ksi)
Elongation (min) 15%
Reduction of Area 25%
Hardness (HRB) ≤ 100 HRB
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)
Electrical Resistivity 55 µΩ·cm
Max Service Temperature (Oxidizing) 316°C (600°F)
Processing Methods

Available Processing Methods

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

Cold forming — Limited; higher springback and tooling forces required
Hot forming — Recommended for complex geometries; form at 260–540°C (500–1,000°F)
CNC machining — Fair; work hardens rapidly — use sharp tools and heavy feed rates
TIG welding — Good; post-weld stress relief recommended
Laser welding — Acceptable with proper shielding gas parameters
Forging — Open and closed-die forging at 870–980°C (1,600–1,800°F)
Extrusion — Hot extrusion at 900–1,050°C with glass lubricants
Rolling — Requires intermediate annealing for significant cold reduction
Chemical etching — Slower etch rate than lower CP grades
Downstream Products

Typical Products & Components

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

Medical implants — orthopedic plates, screws, dental implants (per ASTM F67)
Surgical instruments and fixation devices
Heat exchanger tubing requiring higher strength than Grade 2
Chemical processing equipment for higher pressure service
Marine fasteners and hardware
Structural components for coastal and offshore infrastructure
Valve stems and high-pressure fittings
Automotive connecting rods and suspension springs
Industries

Primary Industries

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

Medical — Orthopedic implants, dental implants, surgical instruments
Chemical processing — High-pressure vessels, heat exchangers, piping
Marine — Fasteners, hardware, structural components
Aerospace (limited) — Non-critical structural fasteners
Automotive — Performance and racing components
Architecture — Load-bearing structural elements
Power generation — Heat exchanger and condenser components
Alternative Materials

Alternative Materials

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

Grade 3 (CP-Ti) — Lower strength, better formability
Grade 5 (Ti-6Al-4V) — Significantly higher strength for structural applications
Grade 23 (Ti-6Al-4V ELI) — Medical-grade alternative with improved fracture toughness
316LVM Stainless Steel — Lower-cost medical-grade alternative
CP-Ti Grade 4 ELI — Extra-low interstitial version with improved ductility
Technical Reference Data

Comparison Table

Mechanical properties of our core titanium grades. All values represent minimum specified properties per ASTM B265 / AMS 4928 standards.

Titanium Grade Spec Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HV) Primary Advantage
Grade 1 CP-Ti ASTM B265 ≥ 240 ≥ 170 ≥ 24 ~ 120 Maximum formability & corrosion resistance
Grade 2 CP-Ti ASTM B265 ≥ 345 ≥ 275 ≥ 20 ~ 145 Best general-purpose CP balance
Grade 4 CP-Ti ASTM B265 ≥ 550 ≥ 483 ≥ 15 ~ 265 Highest strength CP grade

* All values are minimum specified properties at room temperature per applicable ASTM/AMS standards. Hardness values are approximate Vickers (HV). Consult our engineering team for application-specific data.

Why Boze Titanium Manufacturing Center

Why Choose Us for This Grade

Boze Titanium Manufacturing Center delivers precision-machined Grade 4 CP-Titanium components for medical, marine, and industrial applications with full material traceability and CMM verification.

Frequently Asked Questions

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

What is Grade 4 titanium and what makes it the strongest CP grade?

Grade 4 is the highest-strength grade in the CP titanium family, with increased oxygen content providing higher tensile and yield strengths while retaining excellent corrosion resistance.

What machining capabilities do you offer for Grade 4 titanium?

We machine Grade 4 on 5-axis CNC centers with tolerances up to ±0.005 mm. Grade 4 work-hardens rapidly, so we use sharp carbide tooling with high-pressure coolant.

What are primary applications for Grade 4 titanium?

Grade 4 is used in medical implants per ASTM F67, surgical instruments, heat exchanger tubing, chemical processing equipment, marine fasteners, and automotive components.

Related Components

1 precision CNC machined components manufactured from Grade 4 - Commercially Pure Titanium

Titanium Dental Implant Fixture

Endosseous dental implant fixture screw (Grade 4)

CNC swiss turning for dental geometryCryogenic deburring with Class 6g gaugeUltrasonic clean Class 10k with Class 6g gaugeSterile packaging with Class 6g gauge

Need Grade 4 Components?

Our engineering team delivers precision-machined components in 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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