Titanium Threaded Flange
Updated : Aug. 12, 2025CP-Ti pits < 0.0005 mm/y.
Titanium is 55 % lighter than 316 L and, in Grade 5, 1.7× stronger (use Grade 5 only for seawater or inert media).
Screws on in minutes - no hot work, lines back in service within eight hours.
Key Specifications at a Glance
| Dimension | Range |
|---|---|
| Materials & grades | GR2 (general), GR5 (high‑pressure lightweight – not for wet chlorine), GR7 (wet chlorine / HCl) |
| Size & pressure | NPS ½″–4″, Class 150‑600 / PN 10‑40 |
| Threads | NPT (ANSI B1.20.1) & BSP (ISO 7‑1) |
| Facing | RF / FF |
| QC documents | EN 10204 3.1, 100 % PMI, UT/PT. SGS / BV witness from USD 400 per lot in China; other regions on request. |
| Lead time | Stock 3‑5 days; custom 12‑15 days |
*All weights shown in tables are theoretical, based on ρ = 4.51 g/cm³ and ASME B16.5 Type 5 rough forgings, tolerance ±10 % depending on facing and machining.
Titanium in Chlorine & Seawater Service
Pitting and Crevice Data
CP‑Ti corrodes <0.0005 mm/y at 25 °C in natural seawater; crevice corrosion starts above 80‑90 °C. Grade 7, alloyed with Pd, pushes the crevice threshold to *lab‑tested* 250 °C; typical operating limit is ≤150 °C.
Case: Five‑Year Chlor‑Alkali Turnaround
Grade 7 threaded flanges showed zero measurable attack after five years and 180 ppm free chlorine.
Case: 20‑Year RO Desalination Skid
A major Israeli RO plant has run Grade 7 flanges for two decades with no replacement or anode protection.
One‑Minute Selection Guide
| Fluid | First choice | Key reason |
|---|---|---|
| Seawater / RO / ultrapure | GR2 | Lowest cost, 15‑20 yr lifetime |
| Wet chlorine / HCl | GR7 | Pd alloy fights crevice corrosion |
| High pressure + weight saving | GR5 | 1.7× strength, 0.55× weight (not for wet chlorine) |
Quality Assurance You Can Audit
1. Raw‑material traceability by heat‑number and PMI.
2. Three‑step inspection: PMI → dimensional → UT/PT.
3. Third‑party witness available; costs start from \~USD 400 per lot ex‑China.
Installation & Maintenance Tips
Thread Sealants
Use pure PTFE tape or PTFE‑lined graphite; avoid copper‑ or zinc‑bearing compounds.
Torque & Leak Check
See Table 2‑1 for Class 150‑600 torque. Retorque 24 h after first assembly.
Lead Time & Logistics
| Type | Lead time | Packing & shipping |
|---|---|---|
| Stock | 3‑5 days | ISPM‑15 crates + PE wrap + desiccant |
| Custom | 12‑15 days | ≤50 kg airfreight; LCL sea for heavy loads |
FAQ (Schema‑ready)
Q: What is the maximum pressure rating?
A: Up to Class 600; above that, use weld‑neck or socket‑weld titanium flanges.
Q: Can I use PTFE tape on titanium threads?
A: Yes. PTFE is inert to titanium.
Q: Is Grade 5 suitable for wet chlorine?
A: No. Choose Grade 7 instead.
Q: Will titanium gall under repeated assembly?
A: Coat threads with a moly‑based anti‑seize to prevent galling.
Request Your 24‑Hour Quotation
Send mail **Size | Pressure | Medium | Qty** and get a detailed XLS in 24 h.Quick Quote
