Material group 51.2: Pure Titanium with 0,2 < O2 ≤ 0,25 %
These unalloyed titanium grades have an excellent corrosion resistance property, excellent weldability and is used in a wide variety of applications. The corrosion resistance of Titanium is due to a stable, protective, and strongly adherent oxide film layer. This film forms instantly when a fresh surface is exposed to air or moisture. This film growth is accelerated under strong oxidizing conditions. The Titanium oxide film is capable of healing itself instantly in the presence of moisture or oxygen. Because of this, Titanium applications are common in the fabrication of process equipment of chemical industries.
Features of Titanium pure Group 51.2 ISO/TR 15608
Grade 2:
Moderate strength unalloyed Ti with excellent weldability, cold formability, and fabricability; “workhorse” and “garden variety” Ti grade for industrial service with excellent resistance to mildly reducing to highly oxidizing media with or without chlorides. Approved for sour service use under the NACE MR-01-75 Standard.
This grade material is mainly used in chemical industries where the parts are subjected to very harsh environments.
Grade 7:
Most resistant Ti alloy to corrosion in reducing acids and localized attack in hot halide media, with physical/mechanical properties equivalent to Grade 2, and excellent weldability/fabricability.
Grade 16:
Lower cost, leaner Pd version of Grade 7 with equivalent physical/mechanical properties, and similar corrosion resistance.
Grade 26:
Lower cost, Ru-containing alternative for Grade 7 with equivalent physical/mechanical properties and fabricability and similar corrosion resistance.
Welding of Titanium pure Group 51.2 ISO/TR 15608
Commercially pure titanium and most titanium alloys are readily welded by a number of welding processes being used today. The most common method of joining titanium is the gas Tungstenarc (GTAW) process and secondarily is the gas metal-arc (GMAW) process. The techniques for welding titanium resemble those employed with nickel alloys and stainless steels. To achieve sound welds with titanium, primary emphasis is placed on surface cleanliness and the correct use of inert gas shielding.
An essential requirement for successfully arc welding titanium is proper gas shielding. Care must be taken to ensure that inert atmosphere protection is maintained until the weld metal temperature cools below 426°C (800°F).
Typical materials in group 51.2
| Name / Grade | Number | Standard | Product | Remarks |
|---|---|---|---|---|
| Ti 2 | 3.7035 | DIN 17851 | – | – |
| 2 2 2 WPT 2 F-2 2 2 | R50400 R50400 R50400 R50400 R50400 R50400 R50400 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate & Sheet Smls. & welded tube Bar Smls. & welded fitting Forgings Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 2H 2H 2H F-2H 2H 2H | R50400 R50400 R50400 R50400 R50400 R50400 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-381 ASTM B-861 ASTM B-862 | Plate Smls. & welded tube Bar Forgings Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| Ti 7 | 3.7235 | DIN 17851 | – | – |
| 7 7 7 WPT 7 F-7 7 7 | R52400 R52400 R52400 R52400 R52400 R52400 R52400 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate & Sheet Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 7H 7H 7H WPT 7H F-7H 7H 7H | R52400 R52400 R52400 R52400 R52400 R52400 R52400 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 16 16 16 WPT 16 F-16 16 16 | R52402 R52402 R52402 R52402 R52402 R52402 R52402 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 16H 16H 7H WPT 16H F-16H 16H 16H | R52402 R52402 R52402 R52402 R52402 R52402 R52402 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 26 26 26 WPT 26 F-26 26 26 | R52404 R52404 R52404 R52404 R52404 R52404 R52404 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | Plate Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| 26H 26H 26H WPT 26H F-26H 26H 26H | R52404 R52404 R52404 R52404 R52404 R52404 R52404 | ASTM B-265 ASTM B-338 ASTM B-348 ASTM B-363 ASTM B-381 ASTM B-861 ASTM B-862 | PPlate Smls. & welded tube Bar Smls. & welded fitting Forging Smls. pipe Welded pipe | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |