Lap Joint Titanium Flange

Product Introduction 

Lap Joint Titanium Flange for Industrial Piping Systems — Corrosion-Resistant & Cost-Optimized Solution

Baoji Huacan's Lap Joint Titanium Flange is a two-component piping assembly built for demanding industrial environments. It features a titanium stub end welded directly to the pipe and a loose backing flange that rotates freely for easy bolt-hole alignment. Available in Grade 2, Grade 5 (Ti-6Al-4V), Grade 7, Grade 9, and Grade 23, with OD up to 200mm and Class 150 pressure rating as standard. 

Product Specification & OEM Customization

Parameter	Details
Material Grade	Grade 2, Grade 5 (Ti-6Al-4V), Grade 7, Grade 9, Grade 23; subject to application and material availability
Material Standard	ASTM B381 for titanium and titanium alloy forgings; other material specifications available upon request
Flange Type	Lap Joint Flange; designed for use with a compatible stub end
Size & Dimensions	Custom outer diameter, nominal pipe size, bore, and thickness manufactured according to drawings or agreed specifications
Pressure Rating & Design Standard	Designed according to applicable piping specifications and service conditions; pressure rating confirmed based on material, dimensions, temperature, and design requirements
Facing & Surface Finish	Flat Face (FF) or other specified facing; sealing face finish and roughness according to drawing and gasket requirements
Manufacturing & Customization	Forging, CNC machining, drilling, and surface finishing; custom dimensions, material grades, and drawing-based production available

Material Advantages

Product Application

• Seawater desalination and offshore platforms — titanium stub ends resist pitting and crevice corrosion in high-chloride environments. The rotatable design simplifies alignment during subsea or confined-space installations.
• Chlor-alkali and bleaching plants — titanium is one of the few metals that resists wet chlorine gas and hypochlorite solutions. The lap joint configuration allows stub end inspection for erosion without cutting the pipe.
• Hydrometallurgy and acid leaching — Grade 7 or Grade 12 assemblies handle sulfuric acid at elevated temperatures in HPAL autoclaves, where the separated backing flange also prevents structural contact with acid splashes.
• Chemical processing and energy industries — Lap Joint Titanium Flange widely used wherever corrosive media, thermal stress, or weight constraints make conventional steel flanges inadequate.

Why Choose Us

Only the titanium stub end contacts the process fluid — so you only pay for titanium where it truly matters. The backing flange can be carbon steel or stainless steel, which significantly reduces total material costs without compromising corrosion performance.

The freely rotating backing flange eliminates bolt-hole misalignment during installation. This is particularly useful in complicated, stiff pipe systems where it is difficult and time consuming to align fixed flanges.

We have over 10 years of titanium machining expertise with 40+ CNC machines and over 1,000 tons of yearly production capacity to give consistent dimensional precision and predictable lead times for small batch and big volume customers.

Manufacturing Capability

Our Baoji facility combines forging, rolling, and precision CNC machining under one roof. Key capabilities include:

• Annual forging capacity: 3,000+ tons
• Annual melting capacity: 5,000+ tons
• CNC machines: 40+ units, including gantry machining centers
• Titanium grades processed: TA1, TA2, Ti-6Al-4V, and more
• Standards followed: ASTM B348, ASTM B381, AMS 4928, DIN
• This integrated setup ensures full traceability and tight tolerance control across the entire production chain.

melting	melting	forging	forging	rolling

Quality Control

Certifications

Baoji Huacan holds ISO 9001 quality management system certification, covering all stages from raw material procurement to final inspection and shipment. Our production processes align with ASTM, AMS, and DIN international standards. Material test certificates and certificates of conformance are available for every order.

Our multi-stage inspection process covers every production phase:

• Raw material verification — spectrometer composition analysis and supplier certification checks
• In-process dimensional control — real-time monitoring at each machining step
• Ultrasonic testing (UT) — detects internal cracks, voids, or inclusions without damaging parts
• CMM dimensional inspection — verifies all critical dimensions against drawing tolerances
• Mechanical testing — tensile strength, yield strength, and hardness per ASTM/AMS standards
• Surface inspection — roughness measurement and visual defect detection
• Final documentation — material test certificates (MTC), EN 10204 3.1, and full traceability records provided per shipment

FAQ

Q: Can I use a carbon steel backing flange with a titanium stub end?

A：Yes — this is the most common cost-saving configuration. Just ensure the carbon steel flange is galvanized or epoxy-coated in corrosive external environments to prevent galvanic contact.

Q: What pressure class is this flange rated for?

A：Our standard offering is Class 150. Other pressure classes are available as customized options per ASME B16.5 or equivalent standards.

Q: How do I prevent galling during installation?

A：Use anti-seize lubricant on the bolts and follow a cross-pattern torque sequence to ensure even load distribution across the lap joint face.

Q: Is this suitable for high-temperature steam applications?

A：Titanium performs well in many steam environments. For temperatures above 600°F (315°C), creep resistance must be evaluated — Grade 5 or Grade 12 is typically recommended. Contact us with your process conditions for material guidance.

Q: Does the backing flange contact the process fluid?

A：No. In a correctly assembled product system, only the titanium stub end contacts the fluid. This is what makes mixed-material configurations both safe and cost-effective.

Contact Us

Ready to source a reliable Lap Joint Titanium Flange? Send your drawings or specifications to Joy@hc-titanium.com  — we respond within 24 hours.