WN Type Titanium Weld Neck Flange ASTM B381 ASME B16.5 Class150‑2500

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-10-25

1. Product Identity

We are a titanium manufacturer located in Shaanxi China. Titanium Weld Neck Flange (WN‑type) is high‑pressure forged pipe fitting with tapered neck for butt‑welding connection. Designed for critical corrosive piping, salt‑lake lithium, offshore platform and pressure‑vessel projects. We supply standard stock items and fully custom production per customer drawings.

2. Core Technical Parameters

• Flange Type: WN‑Weld Neck Flange
• Size Range: 1/2"‑80" (DN15‑DN2000)
• Pressure Rating: Class 150, 300, 600, 900, 1500, 2500
• Material Grade: Gr1 UNS R50250, Gr2 UNS R50400, Gr5 Ti‑6Al‑4V UNS R56400, Gr7 UNS R52400
• Manufacturing Process: Hot die forging, stress‑relief annealing, CNC full machining
• Executive Standard: ASTM B381, ASME B16.5, ASME B16.47, DIN, EN, JIS

3. Chemical Composition (wt%, ASTM Standard)

4. Mechanical & Corrosion Performance

• Gr1 Tensile ≥240 MPa; Gr2 Tensile ≥345 MPa; Gr5 Tensile ≥895 MPa
• Yield Strength: Gr1 ≥170 MPa; Gr2 ≥275 MPa; Gr5 ≥828 MPa
• Elongation: Gr1≥24%; Gr2≥20%; Gr5≥10%
• Corrosion Resistance: Excellent resistance to seawater, brine, chloride‑rich medium; Gr7 option for reducing acid working condition.
• Weldability: Butt‑weld joint needs high‑purity argon shielding; weld neck design reduces stress concentration for high‑pressure loop.

5. Full Size Range

• Nominal Size: 1/2" ~ 80" (DN15‑DN2000)
• Pressure Class: Class150 up to Class2500
• Seal Face Type: RF, FF, RJ ring‑joint face optional
• Specification: Standard sizes available; non‑standard OD, bolt circle, thickness can be made by customer drawings.

6. Surface Treatment Options

• Pickling: Remove forging oxide scale, general‑purpose export finish
• CNC machined surface: Precision finish for sealing face, mandatory for RJ high‑pressure flange
• Sand blasting: Uniform matte surface, avoid iron contamination risk
• Passivation: Extra anti‑corrosion treatment for coastal or marine project

7. Material Comparison: Titanium WN Flange vs 316L Stainless Steel Flange

WN titanium flange is preferred solution for high‑pressure corrosive piping where stainless steel suffers rapid local corrosion failure.

8. Strict Quality Control & Test Items

1. Raw billet incoming inspection for chemical composition.
2. Hot forging grain structure inspection to eliminate internal shrinkage and porosity.
3. Full dimension inspection: OD, thickness, bolt hole position, sealing face flatness.
4. NDT: Ultrasonic UT test for forging internal defects; MPI test available for high‑class Class1500‑2500 orders.
5. Surface visual inspection, no crack, scratch or iron contamination on weld end and sealing surface.
6. Issued documents: EN10204 3.1 MTC mill test certificate, dimension inspection report, NDT record, batch traceability.

9. Export Packaging & Shipment

• Inner package: Anti‑rust plastic film + foam cushion to protect machined sealing surface.
• Outer package: Fumigated export wooden case, moisture‑proof for ocean freight.
• Permanent marking: Laser mark grade, standard, size, heat number on each flange body.
• Trade term support: FOB, CIF, DDP; sea freight for bulk, air freight for urgent small‑batch orders.

10. Inquiry & Custom Service (Send Your Drawing Now)

We stock standard size WN titanium weld neck flange. Non‑special pressure class, custom sealing face or special dimension can be manufactured according to your technical drawing.

Please provide below information for accurate quotation: 1) Flange standard & pressure class; 2) Size and seal face type; 3) Material grade; 4) Working medium / temperature / pressure; 5) Order quantity and target delivery term.

Website: www.sxqytd.com

Contact us for technical support and formal quotation.