Titanium Grade 1 / 2 / 5 / 7 / 12 Flanges
Teshi Group manufactures Titanium Grade 1 / 2 / 5 / 7 / 12 flanges (ASTM B381 F-1, F-2, F-5, F-7, F-12) as an OEM in India — forged, machined, marked and certified in-house to ASME B16.5, ASME B16.47, EN 1092-1 and customer drawings.
Titanium is around 45 % lighter than steel and is practically immune to seawater, wet chlorine and hypochlorite thanks to a stable, self-healing oxide film.
Titanium Grade 1 / 2 / 5 / 7 / 12 flanges at a glance
| Material | Titanium Grade 1 / 2 / 5 / 7 / 12 |
|---|---|
| Specification | ASTM B381 F-1 / ASTM B381 F-2 / ASTM B381 F-5 / ASTM B381 F-7 / ASTM B381 F-12 |
| UNS / W.Nr. | R50250 / 3.7025 · R50400 / 3.7035 · R56400 / 3.7165 · R52400 / 3.7235 · R53400 / 3.7105 |
| Sizes | NPS ½"–24" (ASME B16.5), 26"–60" (ASME B16.47 A / B), DN 10–600 (EN 1092-1) |
| Pressure class | Class 150, 300, 600, 900, 1500, 2500 · PN 6–40 |
| Facing / ends | RF, FF, RTJ, tongue & groove, male-female; serrated or smooth finish |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
Titanium Grade 1 / 2 / 5 / 7 / 12 chemistry and mechanical properties
Chemical composition of Titanium Grade 1 / 2 / 5 / 7 / 12 (weight %, maximum unless a range)
| Grade | C | Ni | Mo | N | V | Al | Pd | Fe | O | H |
|---|---|---|---|---|---|---|---|---|---|---|
| Grade 1 | 0.08 | — | — | 0.03 | — | — | — | 0.20 | 0.18 | 0.015 |
| Grade 2 | 0.08 | — | — | 0.03 | — | — | — | 0.30 | 0.25 | 0.015 |
| Grade 5 (Ti-6Al-4V) | 0.08 | — | — | 0.05 | 3.5–4.5 | 5.5–6.75 | — | 0.40 | 0.20 | — |
| Grade 7 (Ti-Pd) | 0.08 | — | — | 0.03 | — | — | 0.12–0.25 | 0.30 | 0.25 | — |
| Grade 12 | 0.08 | 0.6–0.9 | 0.2–0.4 | — | — | — | — | 0.30 | 0.25 | — |
Mechanical properties of Titanium Grade 1 / 2 / 5 / 7 / 12 (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| Grade 1 | 240 MPa (35 ksi) | 170 MPa (25 ksi) | 24 % | Highest ductility |
| Grade 2 | 345 MPa (50 ksi) | 275 MPa (40 ksi) | 20 % | Industrial workhorse |
| Grade 5 (Ti-6Al-4V) | 895 MPa (130 ksi) | 828 MPa (120 ksi) | 10 % | High strength |
| Grade 7 (Ti-Pd) | 345 MPa (50 ksi) | 275 MPa (40 ksi) | 20 % | Reducing acids |
| Grade 12 | 483 MPa (70 ksi) | 345 MPa (50 ksi) | 18 % | Hot brines |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| Grade 1UNS R50250 · W.Nr. 3.7025 | ASTM B381 F-1 | ASTM B363 WPT1 | ASTM B265 Gr 1 | ASTM B861 / B862 Gr 1 |
| Grade 2UNS R50400 · W.Nr. 3.7035 | ASTM B381 F-2 | ASTM B363 WPT2 | ASTM B265 Gr 2 | ASTM B861 / B862 Gr 2 |
| Grade 5 (Ti-6Al-4V)UNS R56400 · W.Nr. 3.7165 | ASTM B381 F-5 | Machined from B381 / B348 | ASTM B265 Gr 5 | On request |
| Grade 7 (Ti-Pd)UNS R52400 · W.Nr. 3.7235 | ASTM B381 F-7 | ASTM B363 WPT7 | ASTM B265 Gr 7 | ASTM B861 / B862 Gr 7 |
| Grade 12UNS R53400 · W.Nr. 3.7105 | ASTM B381 F-12 | ASTM B363 WPT12 | ASTM B265 Gr 12 | ASTM B861 / B862 Gr 12 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Titanium is not listed in the ASME B16.5 rating tables; titanium flanges are designed to the flange standard dimensions and rated per the project code. The applicable rating table is issued with every quotation, and flanges are marked with class, material and heat number.
Types we manufacture
Dimension charts
Where Titanium Grade 1 / 2 / 5 / 7 / 12 is used
- Chlor-alkali brine and wet chlorine lines
- Seawater cooling and desalination
- Naval and marine cooling and ballast systems
- Copper, nickel and cobalt autoclave leaching
- Offshore and subsea piping
Testing & certification
- Chemistry including interstitials (O, N, H) reported on the certificate
- Ultrasonic testing of forgings when specified
- Dimensional inspection to ASME B16.5 / B16.9
- Clean-room handling to avoid iron contamination
FAQ
Titanium Grade 1 / 2 / 5 / 7 / 12 flanges: common questions
What specification covers Titanium Grade 1 / 2 / 5 / 7 / 12 flanges?
Titanium Grade 1 / 2 / 5 / 7 / 12 flanges are forged to ASTM B381 F-1 / ASTM B381 F-2 / ASTM B381 F-5 / ASTM B381 F-7 / ASTM B381 F-12 and dimensioned to ASME B16.5, ASME B16.47 or EN 1092-1.
What is the chemical composition of Grade 1?
Grade 1 (UNS R50250): C 0.08, N 0.03, Fe 0.20, O 0.18, H 0.015 (weight %; single values are maximums).
What are the minimum mechanical properties of Grade 1?
Tensile strength 240 MPa (35 ksi), yield strength 170 MPa (25 ksi), elongation 24 %.
Is Teshi Group a manufacturer of Titanium Grade 1 / 2 / 5 / 7 / 12 flanges in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every Titanium Grade 1 / 2 / 5 / 7 / 12 piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
Which ASTM specification covers titanium flanges?
Titanium flanges are forged to ASTM B381 (grades F-1 to F-12 and others), with dimensions to ASME B16.5 or B16.47. Butt weld fittings are made to ASTM B363 (WPT grades).
What is the difference between titanium Grade 2 and Grade 5?
Grade 2 (UNS R50400) is commercially pure titanium with 345 MPa minimum tensile strength and excellent corrosion resistance. Grade 5 (Ti-6Al-4V, UNS R56400) is an alloy with 895 MPa minimum tensile strength for high-stress parts.
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