Titanium Stub End

Our Titanium Stub End (Titanium Lap Joint Stub End) is a professional-grade corrosion-resistant piping fitting, manufactured in strict compliance with international standards including ASTM B363, ASME B16.9, ASME B16.5, and NACE MR0175/ISO 15156. As a direct manufacturer with 17+ years of titanium processing experience, we produce full-specification wrought titanium stub ends using vacuum double-melted (VIM+VAR) titanium and titanium alloy raw materials. Designed for pairing with lap joint flanges, our stub ends are widely used in chemical, petrochemical, marine engineering, pharmaceutical, new energy, and semiconductor industries with high corrosion resistance and cleanliness requirements.

1. Full Compliance with International Standards, Perfect Flange Compatibility : 

- Manufactured strictly in accordance with ASTM B363 (the global core standard for titanium welding fittings), ASME B16.9 butt-weld fitting dimensions, and ASME B16.5 flange matching standards. 100% compatible with ANSI, DIN, JIS, GB and other global mainstream flange systems, ensuring seamless on-site installation.

- Standard Type A (Long Pattern) and Type B (Short Pattern) forms are available, with customizable hub length, bevel angle and flange face diameter to adapt to special piping layouts and installation spaces.

2. Full Titanium Grade Coverage, Ultimate Corrosion Resistance : 

- Full range of commercial titanium grades available: commercially pure titanium GR1, GR2, GR3, GR4; titanium alloys GR5 (Ti-6Al-4V), GR7 (Ti-0.2Pd), GR9 (Ti-3Al-2.5V), GR12 (Ti-0.3Mo-0.8Ni), with custom special titanium alloy formulations available.

Natural excellent corrosion resistance: immune to seawater, chloride ions, oxidizing acids, organic acids, alkalis and most corrosive media. GR7 and - -- GR12 grades are optimized for crevice corrosion and high-temperature corrosion, with far better performance than pure titanium in high-temperature high-chloride environments.

- Compliant with NACE MR0175/ISO 15156 for sour oil and gas service, with excellent resistance to sulfide stress corrosion cracking (SSCC).

3. Precision Dimensional Control, Zero-Leakage Sealing Performance : 

- Flange sealing face flatness ≤0.05mm, perpendicularity ≤0.1mm, outer diameter tolerance ±0.1mm, wall thickness tolerance fully compliant with ASTM B363. Ensures 100% fit with the flange sealing face, eliminating pipeline leakage risks.

- Standard 37.5°±1° butt-weld bevel, with custom flat end, U-shaped bevel and special bevel forms available, adapting to on-site welding processes and ensuring high-quality weld formation.

- Precisely designed rounded corner (R angle) avoids stress concentration, improves the fatigue and vibration resistance of the piping system, and adapts to high-pressure and alternating load working conditions.

4. Excellent Weldability & Mechanical Performance : 

- Vacuum double-melted raw materials with ultra-low impurity content and uniform microstructure ensure excellent weldability. The weld joint strength can reach more than 90% of the base metal, without pores, cracks and other welding defects.

- Precision heat treatment process eliminates processing stress, ensuring dimensional stability under high temperature and high pressure. The maximum working temperature can reach 550℃ (for titanium alloy grades), and the rated working pressure can reach 10MPa (SCH80S wall thickness).

- Excellent fatigue resistance, adapting to complex working conditions with vibration and alternating loads in chemical and marine engineering, and greatly extending the service life of the piping system.

5. 100% Non-Destructive Testing, Zero-Defect Quality Assurance : 

- Every product undergoes full-process quality inspection: 100% Penetrant Testing (PT) in accordance with ASTM E165 to detect surface micro-cracks, pores and other defects; 100% Ultrasonic Testing (UT) for products with wall thickness ≥3mm in accordance with ASTM E237 to detect internal defects.

- Hydrostatic pressure test at 1.5 times the rated working pressure for each batch, with no leakage or deformation allowed. Optional air pressure test, intergranular corrosion test, chemical composition analysis and mechanical property test are available.

- Each product is marked with a unique batch traceability code, and a complete Material Test Report (MTR) and non-destructive testing report are provided with the shipment, supporting third-party SGS/TUV/BV inspection and certification.

6. Lightweight Design, Low Installation & Maintenance Cost : 

- The ultra-low density of titanium greatly reduces the overall weight of the piping system, reduces the support load, and lowers the labor and equipment costs of hoisting and installation.

- When used with lap joint flanges, only the stub end (in contact with the corrosive medium) is made of titanium, and the flange can be made of carbon steel or stainless steel, which greatly reduces the overall procurement cost of the piping system, especially for large-diameter piping systems.

- Excellent corrosion resistance eliminates the need for frequent replacement of fittings, greatly reducing the long-term operation and maintenance costs of the piping system, with significant life cycle cost advantages.

Full Closed-Loop Manufacturing Process :

- High-Purity Raw Material Control

Only vacuum double-melted (VIM+VAR) titanium and titanium alloy bars/plates compliant with ASTM B265 and ASTM B348 standards are used. Each batch of raw materials is subject to chemical composition analysis and mechanical property testing to prevent unqualified raw materials from entering production.

- Precision Forming Processing

 - Seamless titanium stub ends: Integral hot stamping/cold spinning forming process, no weld seam, uniform overall microstructure, no stress concentration, and superior pressure bearing performance.

 - Welded titanium stub ends (large diameter): Full-automatic TIG argon arc welding process with 100% argon protection, uniform weld formation, no pores and crack defects. Post-weld solution heat treatment is performed to eliminate welding stress.

 - Precision CNC machining: CNC lathe is used to process the sealing surface, bevel, inner and outer diameter to ensure dimensional accuracy and flatness. The flange sealing surface is mirror polished to ensure sealing performance.

- Precision Heat Treatment

Vacuum heat treatment furnace is used for solution treatment, annealing and aging treatment. The temperature and holding time are precisely controlled to eliminate processing stress, optimize the microstructure, and ensure the mechanical properties and dimensional stability of the product, avoiding deformation and cracking during use.

- Surface Treatment

 - Standard surface treatment: Pickling + passivation treatment, forming a dense titanium oxide protective film to improve corrosion resistance, with no oil, oxide scale or burrs on the surface.

 - Optional surface treatment: Mirror polishing, sandblasting, anodizing, PTFE coating, adapting to clean, high wear-resistant, strong corrosion and other special working conditions.

- Full-Process Non-Destructive Testing & Quality Inspection

 - Raw material incoming inspection: Chemical composition analysis (direct reading spectrometer + ICP), mechanical property testing, metallographic structure inspection.

 - In-process inspection: Dimensional accuracy inspection, bevel angle inspection, flatness/perpendicularity inspection.

 - Finished product 100% non-destructive testing: Penetrant Testing (PT), Ultrasonic Testing (UT), hydrostatic pressure test.

 - Batch sampling inspection: Intergranular corrosion test, weld Radiographic Testing (RT), salt spray corrosion test.

 - Each batch of products is issued with a complete Material Test Report (MTR), including chemical composition, mechanical properties, non-destructive testing results, heat treatment records, to achieve full traceability of the whole process.

- Chemical & Petrochemical Industry : 

Acid and alkali medium transmission pipelines, hydrometallurgy pipelines, chlor-alkali chemical equipment, flue gas desulfurization (FGD) systems, pesticide/fertilizer production pipelines, organic solvent transmission systems. Perfectly adapted to strong corrosive media such as sulfuric acid, hydrochloric acid, nitric acid and sodium hydroxide, solving the pain point of frequent corrosion leakage of stainless steel and carbon steel pipelines.

- Marine Engineering & Seawater Desalination : 

Seawater desalination equipment piping systems, offshore oil and gas platform transmission pipelines, ship ballast water systems, submarine pipeline connectors, coastal power plant circulating water pipelines, marine observation equipment pipelines. Excellent seawater corrosion resistance and marine biofouling resistance, with a service life of more than 30 years in marine environments without frequent anti-corrosion maintenance.

- Pharmaceutical & Food Processing Industry : 

Pharmaceutical clean piping systems, biological fermentation equipment pipelines, food and beverage production and transmission pipelines, drinking water/pure water equipment pipelines. GR2/GR1 pure titanium is non-toxic, non-precipitating, compliant with FDA and EU food contact standards, and has excellent corrosion resistance to acid and alkali cleaning media, meeting GMP clean production requirements.

- New Energy & Semiconductor Industry : 

Lithium battery electrolyte transmission pipelines, hydrogen energy storage and transportation pipelines, photovoltaic equipment pipelines, semiconductor wafer cleaning equipment pipelines, electronic chemical transmission systems. Excellent corrosion resistance to high-purity chemicals, no metal ion precipitation, no pollution to the medium, meeting the transmission requirements of high-purity electronic grade media.

- Aerospace & Military Industry : 

Aerospace hydraulic piping systems, aircraft fuel transmission pipelines, military equipment special pipelines, satellite/spacecraft pipeline systems. GR5/GR9 titanium alloy has ultra-high strength-to-weight ratio, high temperature resistance and fatigue resistance, which greatly reduces the weight of equipment and improves load capacity.

- Oil & Gas Industry : 

Offshore oil and gas platform gathering and transportation pipelines, sour oil and gas transmission systems, downhole tool pipelines, oilfield water injection systems. Compliant with NACE MR0175/ISO 15156 standard, with excellent resistance to sulfide stress corrosion cracking, adapting to harsh oil and gas extraction working conditions.

Q: What international standards do your Titanium Stub Ends comply with?

A: Our Titanium Stub Ends are manufactured in strict compliance with global mainstream standards, including ASTM B363 (Standard Specification for Wrought Titanium and Titanium Alloy Welding Fittings), ASME B16.9 (Factory-Made Wrought Buttwelding Fittings), ASME B16.5 (Pipe Flanges and Flanged Fittings), ASTM B265, and NACE MR0175/ISO 15156 for sour service applications. We also support custom production according to DIN, JIS, GB, and other regional standards, ensuring 100% compatibility with your piping system and flanges.

Q: What is the difference between Type A and Type B Titanium Stub Ends?

A: The two standard types differ in structure and application scenarios:

- Type A (Long Pattern Stub End) : With a longer straight hub (welding end), the standard length matches ASME B16.9, suitable for most standard piping systems, provides sufficient welding space, and is the most widely used type.

- Type B (Short Pattern Stub End) : With a shorter straight hub, designed for limited installation space, compact structure, suitable for tight piping layouts and small-bore piping systems.We can also customize the hub length, flange face diameter, and R angle according to your drawings and installation requirements.

Q: Which titanium grade should I choose for my application?

A: The grade selection depends on your working medium, temperature, pressure, and corrosion environment:

- For general seawater, water treatment, and food/pharmaceutical applications: GR2 is the most cost-effective and widely used choice, with excellent general corrosion resistance and good weldability.

- For harsh reducing acid, high-temperature high-chloride environments with high risk of crevice corrosion: GR7 is the optimal choice, with palladium addition to significantly improve corrosion resistance.

- For high-pressure, high-temperature, and high-load structural piping: GR5 (Ti-6Al-4V) high-strength titanium alloy is recommended.

- For high-temperature geothermal and moderate corrosion applications: GR12 offers excellent performance at a lower cost than GR7.Our technical team can provide professional grade selection guidance based on your specific working conditions.

Q: What is your minimum order quantity (MOQ)? Do you provide samples?

A: We have a very flexible MOQ to meet your different needs:

- For standard in-stock specifications (GR2, NPS 1/2" to 8", SCH10S/SCH40S): 1 piece minimum order, supporting sample orders and small batch trial use.

- For custom sizes, non-standard grades, and large-bore products: the MOQ is 10 pieces, which can be negotiated and reduced for special cases.

- Free samples: We can provide free sample pieces of standard specifications for you to test dimensional fit, material properties, and welding performance; you only need to cover the international shipping cost. Custom samples can be provided at cost price.

Q: What non-destructive testing (NDT) do you perform on the products? Can you provide test reports?

A: We implement 100% full inspection for every Titanium Stub End, with mandatory NDT items including:

- Penetrant Testing (PT) : 100% PT for all products in accordance with ASTM E165, to detect surface cracks, pores, and other micro defects.

- Ultrasonic Testing (UT) : 100% UT for products with wall thickness ≥3mm in accordance with ASTM E237, to detect internal inclusions, cracks, and other defects.

- Hydrostatic Pressure Test : 1.5 times the rated working pressure hydrostatic test for each batch, no leakage or deformation allowed.Optional NDT services include Radiographic Testing (RT) for welds, Intergranular Corrosion Test, Salt Spray Test, etc. Every order will be provided with a complete Material Test Report (MTR) and NDT test reports, and third-party SGS/TUV/BV certification is also available upon request.

Q: Can you provide custom Titanium Stub Ends according to our drawings?

A: Yes, we provide full custom manufacturing services to meet your personalized needs:

- Custom dimensions: non-standard nominal size, wall thickness, hub length, flange face diameter, R angle, and bevel angle.

- Custom material: special titanium alloy grades, composite titanium materials, and clad titanium stub ends.

- Custom processing: special bevel form, mirror polishing of sealing face, threaded connection, and other special machining requirements according to your drawings.Our engineering team will review your drawings and provide professional optimization suggestions, and we can provide prototype production before mass production to ensure the product fully meets your requirements.

Q: What is the lead time for standard and custom orders?

A: The delivery time is distinguished according to the order type:

- Standard in-stock specifications (GR2, common sizes): delivery within 3-7 days after payment confirmation.

- Custom size/non-standard grade products: delivery within 10-15 days.

- Large-bore custom products, bulk orders (≥500 pieces), and special certified products: delivery within 15-25 days.

- Urgent orders: We have a dedicated expedited production line, which can shorten the delivery time to 2-5 days for small batch urgent orders to meet your project schedule.

Q: Are your Titanium Stub Ends weldable? What welding process do you recommend?

A: Yes, all our Titanium Stub Ends have excellent weldability, as we use vacuum double-melted raw materials with ultra-low impurity content and uniform microstructure. The recommended welding process is GTAW (TIG) Welding (Tungsten Inert Gas Welding) with high-purity argon shielding (purity ≥99.999%) on both the front and back of the weld, using matching grade titanium welding wire. This ensures that the weld joint strength reaches more than 90% of the base metal, without pores, cracks, or oxidation defects. We can provide detailed welding parameter guidelines and matching welding wire recommendations with your order, as well as welding technical support.

Q: Can your Titanium Stub Ends be used with flanges made of other materials (carbon steel, stainless steel)?

A: Yes, this is one of the core advantages of Titanium Stub Ends. When used with lap joint flanges, only the stub end (in contact with the corrosive medium) is made of titanium, while the flange can be made of carbon steel, stainless steel, or other low-cost materials. This greatly reduces the overall cost of the piping system while ensuring the corrosion resistance of the medium-contacting part. Our Titanium Stub Ends are 100% dimensionally compatible with ANSI, DIN, JIS standard lap joint flanges of all material grades, ensuring seamless installation.

Q: What payment terms do you accept for international orders?

A: We accept standard international trade payment terms:

- T/T (Telegraphic Transfer): 30% deposit in advance, 70% balance before shipment.

- Irrevocable L/C at sight for bulk orders over 50,000 USD.

- Alibaba Trade Assurance (100% payment protection for buyers).

- For long-term cooperative partners with good credit, we can offer more flexible payment terms.

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