Titanium Grade 2 is one of the most widely used commercially pure titanium alloys, known for its exceptional corrosion resistance, lightweight nature, and dependable performance in demanding environments. It is extensively used in industries such as chemical processing, marine engineering, oil & gas, and aerospace where both strength and resistance to harsh conditions are essential.

When choosing flanges for your piping systems, it is crucial to understand the standards and dimensions that determine their quality, compatibility, and performance. This guide will give you a detailed overview of Titanium Grade 2 Flanges, their types, standards, dimensions, and applications so you can make the right selection for your project.

What is Titanium Grade 2?

Titanium Grade 2 is a commercially pure titanium alloy with a high strength-to-weight ratio and outstanding resistance to seawater, chlorides, and oxidizing chemicals. Many industries specifically choose Titanium Grade 2 Flanges because they perform efficiently in both high-pressure and highly corrosive environments, all while keeping the system light and easy to manage.

The typical chemical composition of Titanium Grade 2 includes:

• Titanium (Ti): 99.2% minimum

• Iron (Fe): ≤ 0.3%

• Oxygen (O): ≤ 0.25%

• Carbon (C): ≤ 0.08%

• Nitrogen (N): ≤ 0.03%

• Hydrogen (H): ≤ 0.015%

This composition results in a material that is durable, long-lasting, and able to withstand extreme operating conditions without significant degradation.

Key Properties of Titanium Grade 2 Flanges

• Lightweight but Strong – 45% lighter than steel with similar strength.

• Corrosion Resistance – Withstands seawater, chlorides, and chemical exposure.

• Temperature Tolerance – Performs well in both high and low temperatures.

• Biocompatibility – Non-toxic and safe for medical and food processing applications.

• Longevity – Reduces the need for frequent replacements, saving costs over time.

Types of Flanges Made from Titanium Grade 2

Different flange designs are used depending on the system requirements:

1. Weld Neck Flanges
   Designed for high-pressure pipelines, these have a long tapered hub that distributes stress evenly, ensuring a strong welded connection.

2. Slip-On Flanges
   Easy to install and align, making them ideal for low-pressure systems where quick assembly is needed.

3. Blind Flanges
   Used to seal off the end of a pipeline, allowing for testing, inspection, or maintenance without dismantling the system.

4. Socket Weld Flanges
   Provide leak-proof joints for small diameter, high-pressure pipes. The pipe is inserted into a recessed area of the flange and then welded.

5. Lap Joint Flanges
   Used with stub ends in systems that require frequent dismantling and maintenance. They offer flexibility for alignment after welding.

6. Threaded Flanges
   Connected without welding, making them suitable for environments where welding is risky or impractical.

Standards for Titanium Grade 2 Flanges

To ensure safety, compatibility, and reliability, Titanium Grade 2 Flanges are manufactured according to strict international standards. Some of the most common include:

• ASME/ANSI B16.5 – Covers pipe flanges from ½” to 24” in pressure classes 150, 300, 600, 900, and 1500.

• ASME B16.47 – For large-diameter flanges above 24”, available in Series A and Series B.

• DIN Standards – Common in European markets, specifying flange types, pressure ratings, and materials.

• ISO Standards – Internationally recognized for ensuring uniformity in flange design and production.

Dimensions of Titanium Grade 2 Flanges

Flange dimensions determine how well they fit and seal in a piping system. Typical measurements include:

• Outer Diameter (OD) – Overall size of the flange.

• Bolt Circle Diameter (BCD) – Distance between bolt holes, important for proper alignment.

• Bore Size – Internal diameter matching the pipe size.

• Thickness – Varies based on pressure rating and application.

For example, a small 1-inch Class 150 Titanium Grade 2 Flange might have a relatively thin profile for low-pressure use, while a 6-inch Class 600 flange will be thicker and heavier to handle high-pressure loads. The exact dimensions depend on the chosen standard (ASME, DIN, ISO) and the flange type.

Why Choose Titanium Grade 2 Flanges?

Choosing Titanium Grade 2 Flanges offers several benefits:

• Superior corrosion resistance in seawater, brine, and aggressive chemicals.

• Reduced weight helps in applications where every kilogram matters, such as aerospace or offshore installations.

• Long operational life reduces maintenance and replacement costs.

• Versatility to perform in both high and low temperatures without losing strength.

These qualities make them a trusted solution for marine, aerospace, chemical, and oil & gas applications where safety and reliability are critical.

Applications of Titanium Grade 2 Flanges

1. Marine Systems
   Used in desalination plants, seawater pipelines, shipbuilding, and offshore platforms where corrosion is a major challenge.

2. Chemical Processing
   Suitable for systems handling acidic or alkaline solutions, ensuring long-term performance without contamination.

3. Oil & Gas
   Commonly used in offshore drilling rigs, subsea pipelines, and refining systems due to their resistance to harsh environments.

4. Aerospace
   Lightweight and strong, perfect for connecting systems in aircraft where both safety and weight savings are crucial.

5. Medical & Food Processing
   Biocompatible and non-reactive, making them suitable for hygienic systems and equipment.

Maintenance Tips for Titanium Grade 2 Flanges

• Regular Inspection – Check for gasket wear, corrosion signs, and bolt integrity.

• Correct Bolt Torque – Over-tightening or under-tightening can cause leaks.

• Proper Storage – Keep in a clean, dry place to avoid contamination before installation.

• Avoid Harsh Contact – Prevent contact with strong reducing agents like hydrofluoric acid unless properly lined.

Following these practices ensures that Titanium Grade 2 Flanges deliver their maximum lifespan and performance.

Longevity and Cost Efficiency

While Titanium Grade 2 Flanges may have a higher upfront cost compared to carbon steel or stainless steel flanges, their extended service life and reduced maintenance needs make them more economical in the long run. This is especially true in environments where corrosion is a constant risk—replacing cheaper flanges more frequently can end up costing far more over time.

Conclusion

Titanium Grade 2 Flanges are a reliable, high-performance solution for industries that demand lightweight, corrosion-resistant, and long-lasting pipeline connections. By understanding their standards, dimensions, and benefits, you can make an informed decision that ensures safety, efficiency, and durability for your system.

Whether you are installing them in a marine pipeline, chemical plant, oil platform, or aerospace application, these flanges will deliver unmatched performance even under the toughest conditions.