ASTM B861 Grade 2 Seamless Titanium Tube is a seamless titanium tube manufactured from commercially pure Grade 2 titanium (UNS R50400) according to the ASTM B861 specification. It is produced through extrusion and cold drawing processes without any welded seam, providing excellent dimensional accuracy, uniform structure, and reliable performance under demanding conditions.

ASTM B861 Gr2 titanium tube is widely used in aerospace, marine, chemical, petroleum, metallurgy, medical equipment and other fields. It can be used in the manufacture of ships, airplanes, automobile parts, chemical equipment, seawater desalinators, artificial joints, catheters, etc.

Applicable Standards

Standard	Description
ASTM B861	Titanium and Titanium Alloy Seamless Pipe
ASME SB861	Titanium and Titanium Alloy Seamless Pipe (ASME Equivalent)
ASTM Grade	Grade 2
UNS Designation	R50400
Material Type	Commercially Pure Titanium
Certification	EN 10204 3.1 Mill Test Certificate Available

 

Dimensional Tolerances of ASTM B861 Gr2 Titanium Tube

Item	Standard Tolerance
Outside Diameter (OD)	±0.5% of specified diameter (or according to customer requirements)
Wall Thickness	±10% of specified wall thickness
Length	+5 mm / -0 mm (custom tolerance available)
Ovality	Within OD tolerance range
Straightness	≤ 3 mm per meter
Surface Condition	Smooth, clean, free from harmful defects
End Finish	Plain End, Cut End, Customized End Finish

 

Element	Maximum / Requirement (wt%)
Titanium (Ti)	Balance
Nitrogen (N)	≤ 0.03
Carbon (C)	≤ 0.08
Hydrogen (H)	≤ 0.015
Iron (Fe)	≤ 0.30
Oxygen (O)	≤ 0.25
Aluminum (Al)	-
Vanadium (V)	-
Other Elements (Each)	≤ 0.10
Other Elements (Total)	≤ 0.40

 

Property	Value
Density	4.51 g/cm³
Melting Point	1,668°C (3,034°F)
Thermal Conductivity	16.4 W/m·K
Electrical Resistivity	0.56 μΩ·m
Specific Heat Capacity	0.52 J/g·K
Modulus of Elasticity	105 GPa
Coefficient of Thermal Expansion	8.6 × 10⁻⁶ /°C

 

Density	Melting Point	Yield Strength (0.2%Offset)	Tensile Strength	Elongation
4.51 g/cm³	1,668°C (3,034°F)	Psi – 39900 , MPa – 275	Psi – 49900 , MPa – 344	20 %

 

STANDARD	WERKSTOFF NR.	UNS
Titanium Gr2	3.7035	R50400

In the electric power industry, ASTM B861 Gr2 Titanium Straight Tube is used as electrode materials, connectors and other key components because of its good conductivity, which provides a strong guarantee for the stable operation of the power system. In the chemical industry, ASTM B861 Gr2 titanium round tube also plays an important role, such as for the manufacture of corrosion-resistant chemical reactors, storage tanks and other equipment.

 

Feature	Seamless Titanium Tube	Welded Titanium Tube
Manufacturing Process	Produced by extrusion and cold drawing without welding seam	Manufactured by forming titanium strip and welding the longitudinal seam
Weld Seam	No weld seam	Contains a welded joint
Strength	Higher overall strength and structural consistency	Good strength for most industrial applications
Pressure Resistance	Higher pressure capability	Suitable for normal and medium pressure applications
Corrosion Resistance	Excellent	Excellent (properly welded and treated)
Dimensional Accuracy	Excellent	Very good
Wall Thickness	Suitable for thin and thick wall tubes	Excellent for thin wall and large diameter tubes
Size Availability	Limited by manufacturing process	Wider range of large diameters available
Surface Quality	Uniform inside and outside surface	Good surface quality after finishing
Production Cost	Higher	More cost-effective
Delivery Time	Usually longer for custom sizes	Generally faster production
Typical Standards	ASTM B861, ASTM B338	ASTM B862, ASTM B338

When to Choose Seamless Titanium Tube?

High pressure resistance

Maximum reliability and structural integrity

Critical chemical processing equipment

High-performance piping systems

Severe operating environments

 

When to Choose Welded Titanium Tube?

Large diameter tube sizes

Cost-effective solutions

Faster production and delivery

Heat exchanger and condenser tubing

Customized dimensions

 

 

Equipped with modern manufacturing lines and professional testing facilities, we are able to supply ASTM B338, ASTM B861, and ASTM B862 titanium tubes with customized dimensions, surface finishes, and certification requirements. Each tube is inspected throughout the production process to ensure dimensional accuracy, material traceability, and compliance with international standards.

 

1. What is ASTM B861 Grade 2 Seamless Titanium Tube?

ASTM B861 Grade 2 Seamless Titanium Tube is a commercially pure titanium tube (UNS R50400) manufactured in accordance with ASTM B861. It offers excellent corrosion resistance, high strength-to-weight ratio, and outstanding weldability, making it suitable for chemical processing, marine engineering, aerospace, medical equipment, and industrial applications.

 

2. What is the difference between ASTM B861 and ASTM B338?

ASTM B861 covers general-purpose seamless titanium pipes and tubes, while ASTM B338 is specifically intended for seamless and welded titanium tubes used in condensers and heat exchangers. If your application involves heat transfer equipment, ASTM B338 is typically the preferred specification.

 

3. Is Grade 2 Titanium stronger than Grade 1 Titanium?

Yes. Grade 2 Titanium provides higher tensile and yield strength than Grade 1 while maintaining excellent corrosion resistance and weldability. It is the most widely used commercially pure titanium grade for industrial applications.

 

4. What sizes are available for ASTM B861 Grade 2 Titanium Tubes?

We can supply:

Outside Diameter: 6 mm – 219 mm

Wall Thickness: 0.5 mm – 20 mm

Length: Up to 12,000 mm

Custom dimensions are available according to customer drawings or project requirements.

 

5. Do you supply seamless and welded titanium tubes?

Yes. We manufacture both seamless and welded titanium tubes. Seamless tubes are recommended for high-pressure and critical service applications, while welded tubes provide a cost-effective solution for general industrial use.

 

6. What surface finishes are available?

Available surface finishes include:

Pickled

Bright Annealed (BA)

Polished

Machined Finish (Optional)

Custom surface treatments can also be provided upon request.

 

7. What inspection and testing do you perform?

Each ASTM B861 titanium tube can undergo comprehensive quality inspections, including:

PMI (Positive Material Identification)

Chemical Composition Analysis

Mechanical Property Testing

Ultrasonic Testing (UT)

Eddy Current Testing (ECT)

Dimensional Inspection

Visual Surface Inspection

Third-party inspections by SGS, BV, or TUV are also available.

 

8. Can you provide EN 10204 3.1 Mill Test Certificates?

Yes. All titanium tubes can be supplied with EN 10204 3.1 Mill Test Certificates (MTC). Additional inspection reports and third-party certifications are available upon request.

 

9. What industries commonly use ASTM B861 Grade 2 Titanium Tubes?

ASTM B861 Grade 2 Titanium Tubes are widely used in:

Chemical Processing

Marine Engineering

Oil & Gas

Aerospace

Medical Equipment

Power Generation

Desalination Plants

Industrial Fabrication

 

10. Can you manufacture custom ASTM B861 titanium tubes?

Yes. We provide OEM and custom manufacturing services, including:

Custom diameters and wall thicknesses

Fixed or cut-to-length tubes

Special surface finishes

Custom packaging

Project-specific testing and documentation

 

11. What is the delivery time?

Standard sizes are typically shipped within 7–15 days, while customized products usually require 15–30 days, depending on the specifications, production schedule, and order quantity.

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