ASTM B861 vs. B862 Titanium Tubes
Jan 20, 2026
In industries such as aerospace, chemical processing, and marine engineering, titanium tubes are highly valued for their exceptional strength, corrosion resistance, and lightweight properties. However, when faced with ASTM B861 and ASTM B862 standards, many procurement managers often find themselves uncertain: what are the key differences between these two types of titanium tubes, and how do you choose the right one for your project? In this guide, you'll dive into the core distinctions and learn how to make an informed decision.
|
Feature |
ASTM B861 Seamless Titanium Tube |
ASTM B862 Welded Titanium Tube |
|
Manufacturing Process |
Perforated and rolled with smooth inner and outer surfaces, no weld seam |
Titanium strip is coiled and welded, forming a longitudinal weld seam |
|
Corrosion Resistance |
Suitable for highly corrosive and extreme conditions |
Welded seam may have slightly different corrosion resistance, depending on welding quality |
|
Size & Cost |
Limited size range, complex production process, higher cost |
Can produce large diameters and thin-walled tubes, more cost-effective |
|
Primary Applications |
Aerospace, deep-sea equipment, heat exchangers, and reactors |
General chemical pipelines, oil and gas pipelines |
|
Mechanical Properties |
Higher tensile strength and better pressure resistance |
Welded seam may slightly reduce strength in the seam area |
How to Choose? Your Practical Selection Guide
After understanding the core differences, here's how you can make the best choice based on your project needs:
✅ When to Choose ASTM B861 Seamless Titanium Tubes:
High Strength, Corrosion Resistance, and Pressure Resistance: Especially in demanding environments.
Safety & Reliability First: Ideal for aerospace, deep-sea exploration, nuclear energy, and other zero-tolerance safety industries.
Sensitivity to Weld Defects: When the media transported is highly sensitive to defects in the weld.
✅ When to Choose ASTM B862 Welded Titanium Tubes:
Low to Medium Pressure Environments: Best for low-pressure applications, structural support, or less corrosive environments.
Large Diameter & Thin-Walled Needs: When large diameter or ultra-thin-walled pipes are required.
Cost Control & Efficiency: Perfect for projects with a budget constraint, yet requiring good corrosion resistance and long service life.
Mature Application Fields: Welded tube technology is highly refined in industries like power generation, environmental, and desalination.
FAQ
Q: Is the weld seam in ASTM B862 titanium tubes a weak point?
A: Compared to the tube body, the weld seam can indeed be slightly weaker. The heat-affected zone during welding can affect the mechanical properties, especially under extreme conditions. However, modern welding techniques and post-weld heat treatments significantly enhance weld quality, making its strength and corrosion resistance nearly equal to the base material. For extremely harsh conditions, seamless tubes (B861) are a safer choice.
Q: Can you visually distinguish between B861 and B862 titanium tubes?
A: High-quality welded tubes may have minimal visible seams, especially after polishing or processing. The most reliable way to distinguish between B861 and B862 is to refer to the Material Test Certificate (MTC), which clearly states whether the tube conforms to ASTM B861 or B862. Alternatively, non-destructive testing methods like X-ray or ultrasonic inspection can be used to detect the welded vs. seamless portions.
Q: How much more expensive is B861 compared to B862?
A: Generally, ASTM B861 seamless titanium tubes are 10%–30% more expensive than ASTM B862 welded tubes of the same specifications, though this can vary depending on market conditions and supply chain factors.
Choosing between ASTM B861 titanium tubes and ASTM B862 welded titanium tubes isn't about which one is "better," but rather which one is the most suitable for your specific application. Seamless tubes are irreplaceable for reliability and extreme performance, while welded tubes offer significant advantages in terms of cost-effectiveness and suitability for specific applications.
Our factory
My factory is a high-quality titanium and titanium alloy materials manufacturer specializing in the international trade sector. Our product line comprehensively covers titanium tubes, titanium rods, titanium plates, titanium wires, and titanium strips. We possess full-process production capabilities from melting to deep processing, with core equipment including Vacuum Arc Remelting (VAR) furnaces, multi-function fast forging presses, precision hot/cold rolling mills, high-speed wire rod rolling mills, and high-precision straightening and cutting equipment. Leveraging advanced machinery and technology, we are committed to providing customers in global sectors such as aerospace, medical implants, high-end chemical processing, marine engineering, and sports consumer goods with high-performance, dimensionally precise, and consistently reliable titanium products and customized processing solutions.
Titanium product packaging
To ensure that each titanium product meets the highest quality standards, we have established a comprehensive quality inspection system covering raw materials, production processes, and finished goods. Equipped with advanced testing instruments, such as Optical Emission Spectrometers (OES), universal material testing machines, metallographic microscopes, ultrasonic flaw detectors (UT), and corrosion testing equipment, we are capable of precisely analyzing material composition, mechanical properties, microstructure, internal defects, and corrosion resistance. Every batch of products undergoes rigorous testing in strict compliance with international standards such as ASTM, ASME, and AMS, and authoritative third-party inspection reports are provided. Our laboratory maintains complete traceability records, ensuring that every step from order to delivery is verifiable and traceable. This guarantees that we deliver high-standard titanium materials with reliable quality and comprehensive performance data.
Request Technical Consultation
