Ti-6211 – Ti-6Al-2Nb-1Ta-0.8Mo Marine Grade Titanium Ti-6211
Ti-6Al-2Nb-1Ta-0.8Mo (Ti-6211, UNS R56210), also known as Ti-621/0.8 — a near-alpha titanium alloy originally developed by the U.S. Navy for deep-submergence pressure hulls. Its unique Nb+Ta stabilizer system delivers exceptional stress corrosion cracking (SCC) resistance in seawater, superior fracture toughness, and excellent weldability for thick-section marine structures.
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What is Ti-6211 Titanium (Ti-6Al-2Nb-1Ta-0.8Mo)?
Ti-6Al-2Nb-1Ta-0.8Mo, commonly referred to as Ti-6211 or Ti-621/0.8, is a near-alpha titanium alloy originally developed by the U.S. Navy in the 1950s–1960s for deep-submergence pressure hull applications. Its distinctive composition combines 6% aluminum (alpha stabilizer) with niobium (2%), tantalum (1%), and molybdenum (0.8%) — the Nb+Ta combination providing exceptional resistance to stress corrosion cracking (SCC) in marine environments. This alloy is renowned for its outstanding fracture toughness, excellent weldability for heavy sections, and robust performance under high hydrostatic pressure at ocean depths.
Classification
UNS R56210
Common Names
Key Characteristics
- Exceptional stress corrosion cracking (SCC) resistance in seawater and saline environments
- Superior fracture toughness with high safety margins for pressure-critical applications
- Excellent weldability — low crack sensitivity in heat-affected zones for thick-section welding
- Good elevated-temperature strength and creep resistance
- Excellent formability and machinability compared to beta-rich titanium alloys
- Designed specifically for high-pressure deep-sea service conditions
Applicable Standards
Ti-6211 titanium conforms to the following international material standards:
Mechanical & Physical Properties
Typical room-temperature properties for Ti-6211 (annealed condition, unless noted):
Available Processing Methods
Ti-6211 can be processed using the following manufacturing techniques:
Typical Products & Components
Ti-6211 is commonly fabricated into the following downstream products:
Primary Industries
Ti-6211 serves as a material of choice across these industries:
Alternative Materials
Depending on application requirements, Ti-6211 may be substituted by:
Why Choose Us for This Grade
BOZE CNC Ti is a precision manufacturer of Ti-6211 (Ti-6Al-2Nb-1Ta-0.8Mo) near-alpha titanium components for defense, deep-sea exploration, and marine engineering applications. Our AS9100D-certified facility sources 100% certified Ti-6211 plate, bars, and forgings, and transforms them into complex pressure vessel components, structural assemblies, and subsea hardware using state-of-the-art 5-axis CNC machining centers, precision turning, advanced TIG/laser welding, and wire EDM. Every component is produced under AS9100D and ISO 9001:2015 quality systems with full material traceability from mill to finished part. Our engineering team provides 24-hour DFM review and competitive quoting, backed by decades of metallurgical expertise in near-alpha titanium processing for critical marine service.
Frequently Asked Questions
Common questions from engineers about this titanium grade and our precision machining capabilities.
What is Ti-6211 (Ti-6Al-2Nb-1Ta-0.8Mo) titanium alloy?
Ti-6211, also known as Ti-621/0.8, is a near-alpha titanium alloy developed by the U.S. Navy for deep-submergence pressure hulls. Its unique niobium + tantalum stabilizer system provides exceptional resistance to stress corrosion cracking in seawater, combined with outstanding fracture toughness and excellent weldability for thick-section marine structures.
What makes Ti-6211 different from Grade 5 (Ti-6Al-4V) for marine applications?
While Grade 5 offers excellent general corrosion resistance, Ti-6211 is specifically formulated for the demanding conditions of deep-sea service. The Nb+Ta additions dramatically improve resistance to stress corrosion cracking (SCC) under sustained load in seawater — a critical failure risk for pressure vessels. Ti-6211 also exhibits superior fracture toughness (85–110 MPa√m) and significantly better weldability for thick-section welding.
What welding processes are suitable for Ti-6211? Can you weld thick plates?
Ti-6211 is one of the most weldable high-strength titanium alloys. TIG, laser beam, and electron beam welding are all applicable. Its low crack sensitivity in the heat-affected zone makes it particularly suitable for heavy-section (50 mm+) plate welding required for pressure hull fabrication. Matching filler metal with strict inert gas shielding is essential for all welding operations.
What machining capabilities do you have for Ti-6211 components?
We offer precision 5-axis CNC machining, CNC turning, and wire EDM for Ti-6211 components. Our DMG Mori and Mazak machining centers with high-pressure coolant systems can handle complex pressure vessel components and structural parts. CMM dimensional verification per AS9102 is available for all critical features.
Need Ti-6211 Marine Grade Titanium Components?
Our engineering team delivers precision-machined components in Ti-6211 (Ti-6Al-2Nb-1Ta-0.8Mo) Near-Alpha Titanium. Submit your RFQ for a competitive quote within 24–48 hours.
One Metal. One Focus. Infinite Precision.
Founded in 2011 in Baoji's Titanium Valley, BOZE Metal is dedicated exclusively to titanium — from raw material to precision engineering. AS9100D, ISO 13485 & ISO 9001 certified with 500+ clients across Aerospace, Medical & Motorsport industries, we deliver end-to-end precision titanium CNC machining with full material traceability from source to component.
Boze CNC Ti is the dedicated titanium manufacturing center of Baoji Boze Metal Products Co., Ltd.