Ti Grade 3 / UNS R50550 / W.Nr. 3.7055

Grade 3 Titanium

Grade 3 Titanium

Grade 3 Titanium (also known as Ti Grade 3 or Titanium Grade 3), provides a unique combination of enhanced mechanical properties, exceptional ductility, and superior formability compared to its counterpart, Grade 2 Titanium. This versatile metal is highly sought after in industries where corrosion resistance is a crucial design element, such as in the manufacturing of chemical production components, marine equipment, and airframe applications.

Not only does Ti Grade 3 offer remarkable strength up to 400 °F, but it also boasts remarkable oxidation resistance at temperatures reaching 600 °F. As a result, Titanium Grade 3 has become the go-to choice for those in search of a durable and reliable metal that can withstand the demands of various applications and environments.
The superior mechanical properties of Grade 3 Titanium can be attributed to its slightly higher strength than Grade 2. This enhanced strength allows it to withstand stress levels up to 400 °F, making it a preferred choice for components that require improved durability. Additionally, Grade 3 Titanium demonstrates excellent oxidation resistance, withstanding temperatures up to 600 °F without significant degradation.

Ti Grade 3 Inventory

Product Form Size range from Size range to

Ti Grade 3 pipe

0.5 in 8 in

Ti Grade 3 tube

12 mm 260 mm

Ti Grade 3 pipe fittings

0.5 in 8 in

Ti Grade 3 flanges

0.5 in 8 in

Industries and Applications

Titanium Grade 3, is a versatile and robust metal that has found its way into numerous industries due to its superior properties. Known for its exceptional mechanical properties, ductility, and formability, Ti Grade 3 has proven to be the ideal choice for countless applications.

Chemical Processing Industry: Grade 3 Titanium is widely utilized in the chemical processing sector for manufacturing components that demand high corrosion resistance. Its ability to withstand harsh chemicals and extreme conditions make it the perfect candidate for applications like heat exchangers, tanks, and reactors.

Aerospace and Aviation: The aerospace and aviation industries rely on Titanium Grade 3 for its excellent strength-to-weight ratio and durability. Ti Grade 3 is commonly employed in airframe applications, as well as various components such as fasteners and engine parts, where both strength and corrosion resistance are essential.

Marine Industry: Due to its unparalleled resistance to seawater corrosion, Grade 3 Titanium is a preferred material in the marine sector. From ship components to underwater equipment, Ti Grade 3 is the top choice for various applications in this industry, including propeller shafts, hulls, and other subsea equipment.

Medical Industry: The biocompatibility and corrosion resistance of Titanium Grade 3 make it an ideal material for medical devices and implants. Surgical instruments, orthopedic implants, and dental prosthetics are just a few examples of the medical applications that benefit from the use of Ti Grade 3.

Oil and Gas Industry: Grade 3 Titanium is also popular in the oil and gas industry, where its strength, corrosion resistance, and lightweight properties are highly valued. From drilling equipment to pipeline infrastructure, Ti Grade 3 has a vital role in ensuring the reliable performance of these demanding applications.

Resistance to Corrosion

Grade 3 Titanium is a highly desirable material thanks to its exceptional resistance and corrosion properties. These characteristics make it an ideal choice for various applications across numerous industries, where the metal’s performance and durability are of paramount importance.

Corrosion Resistance: Ti Grade 3 is well-known for its outstanding corrosion resistance, which is due to the passive oxide layer that naturally forms on the metal’s surface when exposed to air or water. This protective barrier shields the underlying material from environmental factors such as moisture, chemicals, and extreme temperatures. As a result, Grade 3 Titanium maintains its integrity, even in the most challenging environments.

Resistance to Seawater Corrosion: Titanium Grade 3 stands out for its exceptional resistance to seawater corrosion, making it an optimal choice for marine applications. The passive oxide layer mentioned earlier not only prevents the metal from corroding in seawater but also offers protection against galvanic corrosion, which can occur when two dissimilar metals come into contact in a corrosive environment.

Chemical Resistance: The corrosion resistance properties of Ti Grade 3 extend to a wide range of chemicals, including acids, alkalis, and salts. This makes Grade 3 Titanium an excellent choice for components and equipment in the chemical processing industry, where exposure to harsh chemicals and aggressive environments is commonplace.

Crevice and Pitting Corrosion Resistance: Titanium Grade 3 is also highly resistant to localized forms of corrosion, such as crevice and pitting corrosion. These types of corrosion can result in severe material damage and, ultimately, equipment failure. However, the inherent corrosion resistance properties of Ti Grade 3 make it a reliable choice for applications prone to these localized corrosion risks.

Stress Corrosion Cracking Resistance: Grade 3 Titanium exhibits impressive resistance to stress corrosion cracking, a form of corrosion that can lead to catastrophic failures in metals subjected to tensile stress in a corrosive environment. This property further establishes Titanium Grade 3 as a dependable material for use in high-stress applications.

Fabrication and Heat Treatment 

Grade 3 Titanium is a versatile and robust material, offering unique fabrication and heat treatment options. These characteristics contribute to its wide range of applications across various industries, ensuring the best performance and adaptability for each specific use.

Fabrication of Grade 3 Titanium: Ti Grade 3 is known for its excellent formability and ductility, making it a suitable choice for various fabrication methods. Some common fabrication techniques for Titanium Grade 3 include:

  • Welding: Grade 3 Titanium is easily weldable using conventional methods such as gas tungsten arc welding (GTAW), plasma arc welding (PAW), and gas metal arc welding (GMAW). The metal’s low thermal conductivity and high reactivity to oxygen require specific precautions, such as shielding gas and a clean environment, to achieve optimal results.
  • Machining: Ti Grade 3 can be machined using standard techniques, although some adjustments may be necessary due to the metal’s unique properties. Slow speeds, heavy feeds, and sharp tools help prevent work hardening and ensure successful machining.
  • Forming: Grade 3 Titanium’s excellent formability allows it to be formed into complex shapes using methods such as bending, drawing, and stamping. Lubrication and controlled forming speeds are crucial to prevent galling and work hardening during the process.

Heat Treatment of Titanium Grade 3: Although Ti Grade 3 is a commercially pure titanium grade and does not exhibit significant hardenability through conventional heat treatment methods, it can still undergo specific heat treatments to optimize its performance:

  • Stress Relief Annealing: To relieve residual stresses from fabrication processes such as welding, forming, or machining, Grade 3 Titanium can undergo stress relief annealing. This process typically involves heating the material to a temperature of around 900-1100°F for a specific duration, followed by controlled cooling.
  • Recrystallization Annealing: Recrystallization annealing is another heat treatment option for Titanium Grade 3, aiming to refine the metal’s grain structure and improve its mechanical properties. This treatment involves heating Ti Grade 3 to a temperature of approximately 1200-1300°F and holding it for a specified time before cooling.

    Grade 3 Titanium – Applicable Specifications

    Form ASTM ASME Other

    Grade 3 Titanium Plate

    B265 Gr 3 SB-265 Gr 3 AMS 4900, MIL-T-9046

    Grade 3 Titanium Sheet

    B265 Gr 3 SB-265 Gr 3 AMS 4900, MIL-T-9046

    Grade 3 Titanium Bar

    B348 Gr 3 SB-348 Gr 3 AMS 4921, AMS 4977

    Grade 3 Titanium Wire

    B348 Gr 3 SB-348 Gr 3 AMS 4950

    Grade 3 Titanium Pipe

    B337 Gr 3 SB-337 Gr 3 ASTM B861

    Grade 3 Titanium Fittings

    B363 Gr WPT3 SB-363 Gr WPT3  

    Grade 3 Titanium Forgings

    B381 Gr F3 SB-381 Gr F3 AMS 4920

    Grade 3 Titanium Welding Rod

    B348 Gr 3 SB-348 Gr 3 AMS 4957

    Grade 3 Titanium Welding Wire

    B348 Gr 3 SB-348 Gr 3 AMS 4957

    Common Trade Names

    Grade 3 Titanium is often marketed under various trade names, such as Ti-3, Titanium CP Grade 3, and Ti50A. These names signify the same high-quality, commercially pure titanium with enhanced mechanical properties and corrosion resistance.


    Key Properties

    (in annealed condition)

    Property Ti Grade 3
    Tensile Strength 485 MPa (70,300 psi)
    Yield Strength (0.2% offset) 345 MPa (50,000 psi)
    Elongation 18%
    Hardness (Rockwell) 35 HRB

    Chemical Composition (%)

    Element Ti Grade 3
    Titanium (Ti) 88.6 – 91.0
    Aluminum (Al) 2.5 – 3.5
    Vanadium (V) 2.0 – 3.0
    Iron (Fe) 0.30 max
    Oxygen (O) 0.35 max
    Carbon (C) 0.10 max
    Nitrogen (N) 0.05 max
    Hydrogen (H) 0.015 max

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