Tantalum is a rare refractory metal that plays a critical role in numerous advanced industries due to its outstanding corrosion resistance, high melting point (over 3000°C), and excellent biocompatibility. Understanding different tantalum grades and ASTM standards is essential for engineers, procurement specialists, and manufacturers to select the appropriate material for demanding applications such as aerospace, semiconductors, and chemical processing.
This article offers a comprehensive overview of common tantalum grades and ASTM standards—Ta1, Ta2.5W, Ta10W, R05200, R05400, R05252, and R05255—as well as a comparison of key international specifications: ASTM B708, B365, and B521.
🔹 Overview of Tantalum Grades
| Grade | UNS Number | Composition | Key Features & Applications |
|---|---|---|---|
| Ta1 | R05200 | Pure tantalum (min. 99.9%) | Excellent ductility and corrosion resistance; ideal for chemical equipment, heat exchangers, and electrolytic cells |
| Ta2.5W | R05252 | Tantalum with 2.5% tungsten | Enhanced strength while retaining formability; used in pressure vessels, aerospace parts, vacuum furnace liners |
| Ta10W | R05255 | Tantalum with 10% tungsten | High strength and heat resistance; suitable for reactor linings, nuclear applications, and harsh vacuum environments |
| R05400 | R05400 | Electron beam melted tantalum (min. 99.95%) | Ultra-high purity; used in semiconductor sputtering targets, medical implants, and superalloy production |
Grade summary:
- R05200 ≈ Ta1 (commercially pure tantalum)
- R05252 ≈ Ta2.5W (low tungsten alloy)
- R05255 ≈ Ta10W (high tungsten alloy)
- R05400 = EB melted high-purity tantalum
🔹 Comparison of ASTM Standards
| Standard | Product Types | Applicable Grades | Key Points |
| ASTM B365 | Tantalum rods, bars, wires (PM) | R05200, R05252 | Defines properties of powder metallurgy (PM) tantalum: density ≥95%, mechanical properties, and dimensions; used in high-temperature structures and electrodes |
| ASTM B708 | Plates, sheets, and strips | R05200, R05400 | Covers flat-rolled tantalum products (EB-melted or wrought); used in chemical processing, electronics, and medical devices |
| ASTM B521 | Seamless and welded tubes | R05252, R05255 | Applicable to high-purity tantalum tubing for corrosive or ultra-clean fluid systems, including heat exchangers and lab pipelines |
Standard differences:
- B365: For PM rods and wires
- B708: For EB melted or wrought flat products
- B521: For tubes and pipe components
🏠 About Us
Company Name: Shaanxi Nickel Titanium Copper Metal Co., Ltd.
Website: www.niticu.com
Email: sales@niticu.com
Phone / WeChat / WhatsApp: +86 13335373172
Factory Address: Baotai Road Industrial Park, High-tech Zone, Baoji City, Shaanxi Province, China
We are a professional manufacturer and exporter of tantalum rods, sheets, plates, and tubes. All products comply with tantalum grades and ASTM standards such as B365, B708, and B521. We offer multiple production routes such as powder metallurgy and EB melting, along with third-party inspection, vacuum packaging, and size customization.
