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Product Details:
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| Application: | HEAT EXCHANGER | Alloy No.: | Ti GRADE 7 |
|---|---|---|---|
| OD: | 6.00MM - 114.30MM | Tube Standard: | ASME SB338 |
| Inspection Certificate: | EN10204 3.1 | Manufacturing: | SEAMLESS WELDED |
| High Light: | titanium tubing,titanium round tube |
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ASME SB338 Grade 7 Seamless Round Tube Titanium Pipe Welding for Condensers / Heat Exchangers
Description
Titanium grade 7 is a corrosion resistant alpha titanium alloy with similar mechanical properties to the commercially pure grades. It has a small palladium addition to improve corrosion resistance, particularly in mineral acids and strong brines. It is used mildly reducing or fluctuating conditions. At room temperature it is an alpha alloy. It transforms to beta phase at 913°C, and the alpha phase returns on cooling 890°C.
Titanium is reactive, with a very high affinity for oxygen, which forms a skin of very stable and highly adherent oxide. The skin gives excellent corrosion resistance, despite the reactivity of the metal. The oxide layer forms spontaneously and on exposure to the atmosphere. However, when new parent metal is exposed to anhydrous conditions or in the absence of air, rapid corrosion may occur. Care should also be taken if titanium is to operate in contact with hydrogen, as hydrogen embrittlement from hydride formation can increase strength, with loss of ductility.
Grade 7 is mechanically and physically equivalent to Grade 2, except with the addition of the interstitial element palladium, making it an alloy. Grade 7 possesses excellent weldability and fabricality, and is the most corrosion resistance of all titanium alloys. In fact, it is most resistant to corrosion in reducing acids.
Grade 7 is used in chemical processes and production equipment components.
Titanium Grade 7 has physical and mechanical properties equivalent to CP3 titanium or Grade 2. It has excellent welding and fabrication properties and is extremely resistant to corrosion especially from reducing acids.
Excellent Weldability Titanium
Excellent Fabricability
Physical Properties Equivalent to CP Grade 2
Mechanical Properties Equivalent to CP Grade 2
Most Resistant to Corrosion in Reducing Acids
Chemical Analysis of Titanium Grade 7:
| C | 0.08 Max |
| N | 0.03 Max |
| O | 0.25Max |
| H | 0.015Max |
| Pd | 0.12 - 0.25 |
| Ti | Bal. |
| Fe | 0.30 Max |
Mechnical Property:
| 0.2% Proof Stress | Tensile Strength | Elongation | |
| MPa | MPa | % | |
| Annealed | 275-475 | 345 | 20 |
Titanium Grade 7 Specifications:
| Extrusion | ASME SB-363 |
| Forgings | ASME SB-381 |
| Pipe |
ASME SB-337
|
| Round Bar/Wire | ASME SB-348 |
| Sheet/Plate | ASME SB-265 |
| Tubes |
ASME SB-337
|
Comparative Corrosion Rates:
|
Corrosive Medium
|
Concentration
%
|
Temp
°C
|
Corrosion Rate
mm/year
|
|
| Grade 7 | Grade 2 | |||
|
Aluminium Chloride
|
10 | 100 | <0.025 | <0.025 |
| 25 | 100 | 0.025 | 50 | |
|
Chlorine (wet)
|
– | Room | <0.025 | <0.025 |
|
Citric Acid
|
50 | Boiling | <0.025 | 0.4 |
|
Hydrochloric Acid (HCI)
|
5 | Boiling | 0.18 | >10 |
|
Hydrochloric Acid (N2 Saturated)
|
3 | 190 | 0.025 | >28 |
| 5 | 190 | 0.1 | >28 | |
| 10 | 190 | 8.8 | >28 | |
| 15 | 190 | 40 | – | |
|
Hydrochloric Acid (O2 Saturated)
|
3 | 190 | 0.13 | >28 |
| 5 | 190 | 0.13 | >28 | |
| 10 | 190 | 9.2 | >28 | |
|
Sodium Chloride
|
Brine | 93 | <0.025 | – |
| 10 | 190 | <0.025 | – | |
|
+ Acidified pH1.2
|
23(a) | Boiling | – | nil |
|
Sulphuric Acid
|
5 | Boiling | 0.5 | 48 |
|
Sulphuric Acid (N2 Saturated)
|
1 | 100 | – | 7 |
| 1 | 190 | 0.13 | – | |
| 5 | 100 | – | 26.5 | |
| 5 | 190 | 0.13 | – | |
| 10 | 190 | 1.5 | – | |
|
Formic Acid
|
50 | Boiling | 0.075 | 3.6 |
|
Oxalic Acid
|
1 | Boiling | 1.13 | 45 |
|
Phosphoric Acid
|
50 | 70 | 1.8 | 10 |
| 10 | Boiling | 3.2 | 11 | |
Contact Person: Will Ma
Tel: +86 13918539222
