ASTM B381 Titanium Pipe Flanges

ASTM B381 Titanium Pipe Flanges

XI AN LINHUI IMPORT AND EXPORT Co., LTD. produces ASTM B381 Titanium Pipe Flanges that meet ANSI B16.5 and ANSI B16.47 Series A/B requirements. Our flanges come in a variety of forms, including WNRF (Welding Neck), SORF (Slip-On), BLRF (Blind), SWRF (Socket Weld), THRDRF (Threaded), and Lap Joint. They span pressure ranges from Class 150 to Class 2500.

These flanges, which are composed of Grade 2 and Grade 5 (Ti-6Al-4V) titanium, weigh 45% less than steel and have a tensile strength of more than 895 MPa at a density of just 4.51 g/cm³. Seawater, chlorides, and oxidizing acids cannot penetrate the self-healing TiO₂ oxide layer. We can deliver standard orders in 3–7 days because of our ISO 9001:2015 certification and more than 200 tons of inventory.

Key Features & Benefits

Corrosion Resistance

The spontaneous TiO₂ film lessens pitting and crevice corrosion under severe chemical and marine environments.

Enhanced Ratio of Strength to Weight

60% lighter than steel alternatives, which lowers structural stress without sacrificing pressure integrity.

Broad Temperature Range

According to ASME B31.3 norms, mechanical properties are maintained from cryogenic temperatures up to 315°C (600°F).

Biocompatible and non-magnetic

Perfect for FDA-compliant pharmaceutical pipe systems and delicate equipment.

Manufacturing Process

Heat treatment and forging

From verified billets, flanges are hot-forged at regulated temperatures between 870°C and 950°C. Remaining tensions are removed by post-forging stress relief annealing.

Precision Machining

CNC machining ensures flatness tolerance within ±0.05mm for gasket sealing surfaces. Dimensional accuracy adheres to ASME B16.5 bolt hole patterns.

100% NDT Inspection

Ultrasonic and eddy current testing detect subsurface defects. Every flange undergoes dye penetrant inspection for surface crack detection.

Quality Inspection

· Visual dimensional verification per ANSI/ASME standards

· Hardness testing (Rockwell/Brinell)

· Chemical analysis via spectrometry

· Positive Material Identification (PMI)

· Hydrostatic pressure testing for critical sizes

· EN 10204 3.1/3.2 material traceability certificates

· Third-party inspection available (SGS, BV, TÜV, DNV)

Applications Of ASTM B381 Titanium Pipe Flanges

Offshore Gas and Oil

ASTM B381 Titanium Pipe Flanges are used in fire water systems and subsea risers to prevent stress corrosion cracking at high pressure and salinity.

Alkali-Chlor Plants

ensures there is no chance of contamination when handling hot brine and moist chlorine gas in the manufacturing of caustic soda.

Desalination & Power Generation

Essential in MSF desalination heat exchangers and nuclear condenser loops handling high-temperature brine at velocities exceeding 3 m/s.

Pulp & Paper Bleaching

Withstands chlorine dioxide and aggressive oxidizers in bleaching mixers without wall thinning or gasket erosion.

Export Markets

We have successfully supplied ASTM B381 Titanium Pipe Flanges to more than 60 nations worldwide:

North America: the United States, Canada, and Mexico

Middle East (Kuwait, Saudi Arabia, and the United Arab Emirates) Europe (France, Germany, Netherlands) Southeast Asia, which includes Thailand, Malaysia, and Indonesia

South America, comprising Ecuador, Argentina, and Brazil

Why Choose Us

Factory-Direct Pricing

Eliminate middlemen costs with direct mill supply while maintaining full quality control.

4-Hour Quotation Response

Our engineering team provides technical assessments and pricing within 4 hours of inquiry.

200+ Tons Stock Inventory

Immediate availability of common sizes in Grade 2 and Grade 5 for rush orders.

Full Traceability

Heat number tracking with EN 10204 3.1/3.2 certificates ensures compliance documentation.

Flexible MOQ

Trial orders accepted starting from 100 kg for project evaluations.

Packaging & Shipping

Typical Packaging

Bubble film is used to wrap flanges, which are then put in plywood cases and fastened with steel strapping. During transit, desiccants stop oxidation.

Personalized Marking

Heat numbers, grades, and dimensional markings are laser-etched in accordance with client requirements.

Options for Shipping

Sea freight (20'/40' containers), air cargo for urgent orders, and DHL/FedEx door-to-door delivery for samples.

FAQ

Q: How long does it take to get custom flange dimensions?

A: Stock products are shipped in three to seven days. Depending on order quantity and complexity, custom fabrications take 25–40 days.

Q: Are you able to certify materials for use in nuclear applications?

A: Yes. In accordance with ASME Section III regulations, we may set up third-party nuclear-grade inspections and provide EN 10204 3.2 certificates.

Q: Do your flanges adhere to NORSOK regulations?

A: Absolutely. Our Grade 2 and Grade 7 flanges meet NORSOK M-650 requirements for offshore oil and gas pipe systems.

Q: Do you offer surface treatment for outstanding corrosion resistance?

A: Standard pickled surfaces are adequate for most purposes. For enhanced performance, we provide electropolishing and passivation treatments.

Q: How much is the minimum order quantity?

A: For stock items, trial orders starting at 100 kg are accepted. A minimum of 500 kg is usually required for custom orders.

Request a Quote

Do you need a quick solution—such as ASTM B381 Titanium Pipe Flanges—to tackle the challenges of corrosive environments? Contact our engineering team at linhui@lhtitanium.com today. Submit your drawings and specifications to receive detailed technical proposals within 24 hours. Let's build reliability into your piping systems.