Titanium Grade 2 (UNS R50400) Discs and Circles: Composition, Properties, Standards and Applications

<h1>Titanium Grade 2 (UNS R50400) Discs and Circles: Composition, Properties, Standards and Applications</h1>

<p><strong>Titanium Grade 2 (UNS R50400, W.Nr. 3.7035)</strong> is the most widely used grade of commercially pure titanium. It offers an outstanding combination of corrosion resistance, formability, weldability and moderate strength, and it is the default choice for chemical-process equipment, marine hardware, medical devices and general industrial components. This article covers its chemical composition, mechanical and physical properties, standards, disc and circle specifications, corrosion performance and typical applications.</p>

<h2>What Is Titanium Grade 2?</h2> <p>Titanium Grade 2 is commercially pure (unalloyed) titanium with a controlled interstitial content — oxygen, nitrogen, carbon, hydrogen and iron — that sets its strength level. Among the four commercially pure grades (1, 2, 3 and 4), Grade 2 is the most popular because it balances strength with excellent ductility and cold-formability. Like all titanium, it forms a stable, self-healing oxide film that provides exceptional resistance to chlorides, seawater and oxidizing acids.</p>

<h2>Chemical Composition (wt. %)</h2> <table> <thead><tr><th>Element</th><th>Content (%)</th></tr></thead> <tbody> <tr><td>Titanium (Ti)</td><td>Balance</td></tr> <tr><td>Iron (Fe)</td><td>≤ 0.30</td></tr> <tr><td>Oxygen (O)</td><td>≤ 0.25</td></tr> <tr><td>Carbon (C)</td><td>≤ 0.08</td></tr> <tr><td>Nitrogen (N)</td><td>≤ 0.03</td></tr> <tr><td>Hydrogen (H)</td><td>≤ 0.015</td></tr> <tr><td>Other (each / total)</td><td>≤ 0.10 / ≤ 0.40</td></tr> </tbody> </table>

<h2>Mechanical and Physical Properties</h2> <table> <thead><tr><th>Property</th><th>Typical Value</th></tr></thead> <tbody> <tr><td>Tensile strength</td><td>≥ 345 MPa</td></tr> <tr><td>Yield strength (0.2 % offset)</td><td>≥ 275 MPa</td></tr> <tr><td>Elongation</td><td>≥ 20 %</td></tr> <tr><td>Hardness</td><td>≈ 80 HRB</td></tr> <tr><td>Density</td><td>4.51 g/cm³</td></tr> <tr><td>Melting point</td><td>1668 °C</td></tr> <tr><td>Modulus of elasticity</td><td>102 GPa</td></tr> </tbody> </table>

<h2>Corrosion Resistance</h2> <p>Titanium Grade 2 is virtually immune to attack in a wide range of aggressive environments:</p> <ul> <li>Seawater and chloride solutions (excellent resistance to pitting and crevice corrosion)</li> <li>Oxidizing acids such as nitric and chromic acid</li> <li>Wet chlorine, hypochlorites and bleaching solutions</li> <li>Most organic acids and alkaline media</li> <li>Body fluids and biological environments (biocompatible)</li> </ul> <p>It is not recommended for reducing acids (e.g. hydrochloric or sulphuric acid) or dry chlorine, where higher alloys or Grade 7 are required.</p>

<h2>Standards and Specifications</h2> <table> <thead><tr><th>Form</th><th>Standard</th></tr></thead> <tbody> <tr><td>Plate, sheet and strip</td><td>ASTM B265 / ASME SB265</td></tr> <tr><td>Bar and billet</td><td>ASTM B348 / ASME SB348</td></tr> <tr><td>Forged flanges and fittings</td><td>ASTM B381 / ASME SB381</td></tr> <tr><td>Aerospace material</td><td>AMS 4902</td></tr> <tr><td>Medical implant</td><td>ISO 5832-2</td></tr> <tr><td>Designation</td><td>UNS R50400, W.Nr. 3.7035, Gr.2 Ti</td></tr> </tbody> </table>

<h2>Discs and Circles: Available Specifications</h2> <p>We supply titanium Grade 2 discs and circles cut from plate by plasma, waterjet or laser, with optional edge machining and surface finishing. Discs are commonly used as blanks for flanges, gaskets, sputtering targets and machined components.</p> <table> <thead><tr><th>Product</th><th>Diameter</th><th>Thickness</th><th>Notes</th></tr></thead> <tbody> <tr><td>Cut discs / circles</td><td>50 – 2000 mm</td><td>0.5 – 60 mm</td><td>Plasma, waterjet or laser cut</td></tr> <tr><td>Thick discs / blocks</td><td>up to 1200 mm</td><td>60 – 200 mm</td><td>For flanges and forgings</td></tr> <tr><td>Surface finish</td><td colspan="2">As-cut, machined, pickled or polished</td></tr> <tr><td>Tolerance</td><td colspan="2">Per drawing; ±0.5 mm or better on diameter</td></tr> </tbody> </table>

<h2>Applications</h2> <ul> <li>Chemical and petrochemical process equipment, vessels and heat-exchanger parts</li> <li>Flange blanks, gaskets and machined components</li> <li>Seawater desalination and marine hardware</li> <li>Medical implants and surgical instruments</li> <li>Electroplating, anodizing and bleaching equipment</li> <li>Sputtering targets and vacuum-chamber components</li> <li>Aerospace structural and engine parts (non-critical strength)</li> </ul>

<h2>Titanium Grade 2 vs Grade 5 (Ti-6Al-4V)</h2> <table> <thead><tr><th>Grade</th><th>Type</th><th>Strength</th><th>Best For</th></tr></thead> <tbody> <tr><td>Grade 2 (R50400)</td><td>Commercially pure</td><td>≈ 345 MPa UTS</td><td>Corrosion service, formability, weldability, medical</td></tr> <tr><td>Grade 5 (R56400)</td><td>Alpha-beta alloy</td><td>≈ 895 MPa UTS</td><td>High-strength structural and aerospace parts</td></tr> </tbody> </table> <p>Select Grade 2 when corrosion resistance, ductility and weldability matter most; select Grade 5 when high specific strength is the priority.</p>

<h2>Frequently Asked Questions</h2> <p><strong>What is Titanium Grade 2 used for?</strong><br>Titanium Grade 2 is used for chemical-process equipment, marine and desalination hardware, medical implants, flange blanks and general corrosion-resistant components.</p> <p><strong>Is Titanium Grade 2 stronger than stainless steel?</strong><br>Grade 2 has moderate strength (≈ 345 MPa UTS), lower than most stainless steels, but its corrosion resistance in chlorides and seawater is far superior.</p> <p><strong>Can Titanium Grade 2 be welded?</strong><br>Yes. Grade 2 is readily welded by TIG and other methods, provided adequate inert-gas shielding prevents contamination of the weld zone.</p> <p><strong>What sizes of titanium discs can you supply?</strong><br>We cut Grade 2 discs and circles from 50 mm up to 2000 mm diameter and 0.5 to 60 mm thick, with plasma, waterjet or laser cutting to your drawing.</p>

<h2>Ordering Titanium Grade 2 Discs and Circles</h2> <p>Please specify the standard (e.g. ASTM B265 / ASME SB265), diameter, thickness, cutting method, surface finish and quantity. Browse our titanium range at <a href="https://www.hangboalloys.com/products/category/titanium">titanium products</a> or contact us through the <a href="https://www.hangboalloys.com/contact">contact page</a>. You may also like our guide to <a href="https://www.hangboalloys.com/news/titanovye-listy-i-plity-grade-5">titanium plates and sheets</a>.</p>