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Gr12 Titanium Seamless Pipe
1. Product introduction:Titanium alloy grade 12 is a high corrosion resistant alloy containing small additions of nickel and molybdenum, which enhance corrosion resistance and increase the strength of the alloy to give better mechanical properties than the commercially pure grades. It is used in mildly reducing or fluctuating conditions. In particular, it is used instead of the commercial purity grades (e.g.grade 2) for better resistance to crevice corrosion in hot brines, and where the extra strength allows the use of lighter sections.
2. Delivery time: 5-7 days.
3. Payment terms: L/C or T/T.
Description
Type: Titanium GR12 Seamless Pipe
Material: Titanium Grade 12 (UNS R53400/Ti-CODE 12/Ti-0.3Mo-0.8Ni)
Size:
- Outside diameter: 6″ (DN150/168.3mm)
- Thickness: SCH80S(10.97mm)
Standard: ASME B861
Product Photo Display
Chemical Composition of Titanium Grade 12
| Grade | C | N | O | H | Ti | V | Al | Fe |
|---|---|---|---|---|---|---|---|---|
| Titanium Grade 1 | .08 Max | .03 Max | .18 Max | .015 Max | Bal | .20 Max | ||
| Titanium Grade 2 | 0.1 max | 0.03 max | 0.25 max | 0.015 max | 99.2 min | 0.3 max | ||
| Titanium Grade 4 | .08 Max | .05 Max | .40 Max | .015 Max | Bal | .50 Max | ||
| Titanium Grade 5 | 0.10 max | 0.05 max | 0.20 max | 0.015 max | 90 min | 3.5-4.5 | 5.5-6.75 max | 0.40 max |
| Titanium Grade 7 | .08 Max | .03 Max | .25 Max | .015 Max | Bal | .30 Max | ||
| Titanium Grade 9 | .08 Max | .03 Max | .15 Max | .015 Max | – | .25 Max | ||
| Titanium Grade 12 | .08 Max | .03 Max | .25 Max | 0.15 Max | – | .30 Max |
Mechanical Properties of Titanium Grade 12
| Grade | Tensile Strength(min) | Yeild Strength(min) | Elongation(%) | Remark | ||
| ksi | MPa | ksi | MPa | |||
| Gr.1 | 35 | 240 | 20 | 138 | 24 | |
| Gr.2 | 50 | 345 | 40 | 275 | 20 | |
| Gr.3 | 65 | 450 | 55 | 380 | 18 | |
| Gr.7 | 50 | 345 | 40 | 275 | 20 | |
| Gr.9 | 125 | 860 | 105 | 725 | 10 | cold-worked stress-relieved |
| Gr.9 | 90 | 620 | 70 | 483 | 15 | annealed |
| Gr.12 | 70 | 483 | 50 | 345 | 18 |
ASTM Specifications of Titanium Grade 12
| Specification | Product Form |
| AMS 4902 | |
| ASME B861 (Grade 12)* | Seamless Pipe |
| ASME B862 (Grade 12)* | Welded Pipe |
| ASME SB-381 | Titanium and Titanium Alloy Forgings |
| ASME SB-348 | Titanium and Titanium Alloy Bars and Billets |
| ASTM B265 (Grade 12) | Titanium and Titanium Alloy Strip, Sheet & Plate |
| ASTM B338 | Seamless and Welded Titanium and Titanium Alloy Tubes for Condensers and Heat Exchangers |
| ASTM B348 (Grade 12) | Bars and Billets |
| ASTM B337 (Grade 12) | Welded and Seamless Pipe |
| ASTM B381 (Grade 12) | Forgings |
| ASTM B861 | |
| ASTM B862 | |
| AWS A5.16 (ERTi-12) | Weld Wire |
Corrosion Resistance of Tiatnium Alloy Grade 12
Titanium alloys are usually used in Australia for their excellent corrosion resistance, especially to chloride solutions. The small additions of nickel and molybdenum to grade 12 titanium give a more corrosion resistant metal than the commercial purity grade 2 alloy, with a marked increase in strength. The overall corrosion resistance of this grade is not as good as the palladium alloyed lean grade 7, except for resistance to crevice corrosion in hot chloride solutions. Titanium has excellent resistance to general corrosion, with loss rates of less than 0.04mm/year being typical.
Fabrication with Titanium Alloy 12
Titanium alloy grade 12 is forged conventionally, within the narrow temperature range 815 – 900°C. Titanium and titanium alloys are generally more difficult to forge than both aluminium and alloy steels, due to their high strain rate sensitivity and rapid increase of strength with falling temperature. Hot forging leaves a thick, hard outer layer of titanium oxide on the surface. This layer is called “Alpha Case” and is usually removed by pickling in a mixture of nitric and hydrofluoric acids. As supplied, titanium alloys are usually annealed and pickled, and can be readily cold formed in conventional machines using standard methods. In cold forming the “alpha case” does not form and further pickling is not needed, except to remove any carbon steel embedded in the surface, which can cause pitting corrosion.
Machinability of Titanium Grade 12
Titanium alloy grade 12 is readily machinable by conventional methods. Like stainless steel, titanium has a low thermal conductivity and heat dissipation is inhibited, so copious amounts of coolant should be used. Sharp carbide tools are used. Deep, continuous cuts are best.
Weldability of Titanium Grade 12
Titanium alloy grade 12 is readily weldable by GMAW (MIG) and GTAW (TIG) processes. Preheat or post weld heat treatment are not needed. The area to be welded must be CLEAN, free from all grease and shop dirt, including marking pencil marks. A trailing gas shield is used in addition to the normal welding torch gas shield, to prevent heavy oxidation during cooling. Matching filler metal to AWS specification ERTi-12 is used. The gas shield must be low in hydrogen, oxygen and nitrogen, all of which readily dissolve in titanium and cause embrittlement.
Heat treatment of Titanium Grade 12
Titanium Grade 12 is normally supplied in the annealed condition. After fabrication, stress relief at 480 – 595°C, air cooled, may be required to improve dimensional stability.
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