Grade 3 Pure Titanium | UNS R50550 | JIS Class 3 | DIN 3.7055 (Ti3) Supplier

Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner

1. Grade 3 Pure Titanium Overview

Grade 3 Pure Titanium (Ti3) is a commercially pure titanium grade positioned between Grade 2 and Grade 4 in terms of strength and performance. It offers a unique balance of higher mechanical strength, excellent corrosion resistance, and reliable weldability, making it a preferred material for moderate load-bearing and corrosion-critical applications.

Compared with Grade 1 and Grade 2 titanium, Grade 3 contains higher oxygen and nitrogen levels, which significantly increase its strength while still maintaining the intrinsic advantages of pure titanium—light weight, non-magnetic behavior, and outstanding resistance to aggressive environments.

As a professional Grade 3 titanium supplier, Huaxiao-Alloy supplies UNS R50550 / JIS Class 3 / DIN 3.7055 (Ti3) titanium materials in full product forms, manufactured strictly according to ASTM, ASME, EN, DIN, JIS, and ISO standards, suitable for global engineering and industrial projects.

2. Equivalent Standards & Designations

Grade 3 titanium is internationally standardized and widely accepted across multiple regulatory systems.

Standard System	Designation
ASTM	Grade 3
UNS	R50550
JIS	Class 3
DIN / EN	3.7055 (Ti3)
ISO	ISO 5832-2 Grade 3
GB (China)	TA3

➡️ This wide equivalency ensures Grade 3 titanium can be seamlessly substituted in multinational projects without requalification.

3. Chemical Composition of Grade 3 Pure Titanium

Grade 3 titanium remains commercially pure, with increased interstitial elements to enhance strength.

Element	Maximum Content (%)
Titanium (Ti)	Balance
Oxygen (O)	≤ 0.35
Iron (Fe)	≤ 0.30
Carbon (C)	≤ 0.08
Nitrogen (N)	≤ 0.05
Hydrogen (H)	≤ 0.015

Composition Insight

Oxygen is the primary strengthening element in CP titanium
Low iron content preserves corrosion resistance
No intentional alloying elements, ensuring purity and stability

4. Mechanical Properties of Grade 3 Titanium

4.1 Mechanical Properties at Room Temperature

Property	Typical Value
Tensile Strength	≥ 450 MPa
Yield Strength (0.2%)	≥ 380 MPa
Elongation	≥ 18%
Hardness	≤ 230 HB
Density	4.51 g/cm³
Elastic Modulus	~105 GPa

4.2 Strength Comparison

~30% stronger than Grade 2
Slightly lower ductility than Ti2
Excellent fatigue resistance compared with lower CP grades

5. Key Features & Advantages of Grade 3 Titanium

5.1 Higher Mechanical Strength

Grade 3 provides significantly improved strength over Ti1 and Ti2, allowing:

Thinner wall designs
Higher pressure ratings
Improved structural integrity

5.2 Excellent Corrosion Resistance

Outstanding resistance to seawater and marine atmospheres
Stable in chloride-containing environments
Excellent performance in oxidizing acids such as nitric acid

5.3 Reliable Weldability

Easily welded using TIG, MIG, plasma, and laser welding
Weld zones retain corrosion resistance
No post-weld heat treatment required in most cases

5.4 Lightweight & Non-Magnetic

Density only 4.51 g/cm³
Non-magnetic and non-sparking
Ideal for aerospace, marine, and chemical systems

6. Available Product Forms from Huaxiao-Alloy

Huaxiao-Alloy supplies Grade 3 Pure Titanium in a complete range of mill products and fabricated forms.

6.1 Titanium Sheets & Plates

Standard: ASTM B265
Thickness: 0.8 mm – 60 mm
Surface: Pickled, annealed, polished

6.2 Titanium Pipes & Tubes

Standards: ASTM B338 / ASTM B861
Seamless & welded
OD range: 6 mm – 168 mm

6.3 Titanium Bars & Rods

Standard: ASTM B348
Round, square, hex
Hot-rolled or cold-drawn

6.4 Titanium Wire

Diameter: 0.2 mm – 6.0 mm
Annealed or bright finish

6.5 Forgings & Machined Components

Flanges, rings, fasteners
Custom-machined parts according to drawings

7. Typical Applications of Grade 3 Pure Titanium

7.1 Chemical Processing Industry

Pressure vessels
Heat exchanger plates
Chemical reactors and columns

7.2 Marine & Offshore Applications

Seawater piping systems
Offshore structural components
Desalination equipment

7.3 Power & Energy Sector

Condenser tubing
Cooling systems
Nuclear auxiliary equipment

7.4 Aerospace & Industrial Equipment

Aircraft structural brackets
Ducting systems
Lightweight structural parts

7.5 Industrial Fabrication

Bellows
Corrosion-resistant housings
Thin-wall pressure components

8. Corrosion Resistance Performance

Grade 3 titanium forms a self-healing titanium dioxide (TiO₂) passive layer, providing exceptional corrosion resistance.

✔ Excellent resistance to:

Seawater (static & flowing)
Chloride solutions
Nitric acid
Organic acids

❌ Not recommended for:

Strong reducing acids without inhibitors
High-temperature dry chlorine environments

9. Fabrication, Machining & Welding Guide

9.1 Forming

Moderate cold-forming capability
Higher forming force than Ti1/Ti2
Hot forming recommended for complex shapes

9.2 Machining

Low cutting speed
Sharp carbide tools
Abundant coolant required

9.3 Welding

Argon shielding mandatory
TIG welding most common
Cleanliness critical before welding

10. Heat Resistance & Thermal Properties

Maximum continuous service temperature: ~315°C
Low thermal conductivity
Excellent thermal stability
Minimal distortion under thermal cycling

11. Quality Assurance & Certifications

All Grade 3 titanium supplied by Huaxiao-Alloy includes:

EN 10204 3.1 / 3.2 Mill Test Certificates
Chemical & mechanical testing
Dimensional inspection
UT / Eddy current testing (optional)
ISO 9001 certified quality system
Full heat number traceability

12. Why Choose Huaxiao-Alloy as Your Grade 3 Titanium Supplier?

✅ 15+ years in titanium & special alloy export
✅ Strong production base in Baoji, Shanghai, Wuxi
✅ Competitive bulk pricing
✅ Fast global delivery
✅ OEM & custom machining services
✅ Professional technical support

13. Comparison: Grade 2 vs Grade 3 vs Grade 4 Titanium

Property	Grade 2	Grade 3	Grade 4
Strength	Medium	High	Very High
Ductility	Excellent	Good	Moderate
Corrosion Resistance	Excellent	Excellent	Excellent
Typical Use	Heat exchangers	Pressure parts	Load-bearing