products provided by GNEE
ASTM B338 Alloy Gr7 Titanium Pipe
High-strength Gr 2 Gr 5 Gr 7 Titanium Plate
Availability
GNEE supplies this alloy in various forms, including plates, sheets, strips, bars, seamless and welded pipes, welded fittings, forged billets, and forgings. It is widely used in tubing for condensers and heat exchangers.
Physical Properties
|
Density |
Melting Range |
Modulus of Elasticity (Tension) |
Specific Heat |
Mean Coefficient of Expansion |
Thermal conductivity |
Electrical Resistivity |
|
kg/m3 |
°C |
GPa |
J/kg. °C |
x10 -6 / °C |
W / m. °C |
micro-ohm.m |
| 4,507 | 1668± 10 | 103 | 519 | 8.41 | 11.4 | 0.420 |
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 | |
Fabrication
Titanium grade 7 is forged by conventional processes within the narrow temperature range 815 – 900°C. Titanium and its alloys generally are more difficult to forge than both aluminium and alloy steels, but grade 7 is one of the easier grades. Hot forging leaves a thick, extremely 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 can be readily cold formed in conventional machines using standard methods. When cold formed the oxide layer "alpha case" does not form and pickling is not needed, except to remove embedded carbon steel pickup, which can cause pitting corrosion.
ASTM Product Specifications
| Specification | Title |
| B265 |
Titanium and Titanium Alloy Strip, Sheet & Plate |
| B381 |
Titanium and Titanium Alloy Forgings |
| B348 |
Titanium and Titanium Alloy Bars and Billets |
| B337 |
Seamless and Welded Titanium and Titanium Alloy Pipe |
| B338 |
Seamless and Welded Titanium and Titanium Alloy Tubes for Condensers and Heat Exchangers |
Titanium products provided by GNEE
| Product Form | Common Grades (Typical) | Primary ASTM Standards | Standard Specifications / Dimensions | Available Shapes / Types | Surface Finish |
|---|---|---|---|---|---|
| Titanium Tube | Gr.1, Gr.2, Gr.3, Gr.7, Gr.9, Gr.12, Gr.5 (Ti-6Al-4V) | ASTM B338 | OD: 1mm - 150mm Wall Thickness: 0.5mm - 15mm Length: Up to 15,000mm |
Seamless Tube, Welded Tube, Heat Exchanger Tubes, Condenser Tubes | Pickled, Polished (Mill / Mirror), Annealed, Bright |
| Titanium Bar | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V), Gr.7, Gr.9, Gr.12 | ASTM B348 | Diameter: 3mm - 300mm Length: 3,000mm or custom |
Round Bar, Square Bar, Hexagonal Bar, Wire Rod, Forged Billets | Black (Hot Rolled), Turned, Polished, Centerless Ground, Peeled |
| Titanium Sheet/Plate | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V), Gr.7, Gr.9, Gr.12 | ASTM B265 | Thickness: 0.1mm - 100mm+ Width: Up to 2,000mm Length: Up to 6,000mm |
Sheet (≤ 4.76mm), Plate (> 4.76mm), Coil/Strip, Shim Stock | Hot Rolled, Cold Rolled, Pickled, Sandblasted, Polished, Brushed |
| Titanium Foil | Gr.1, Gr.2 | ASTM B265 | Thickness: 0.03mm - 0.1mm Width: Up to 500mm |
Foil, Strip | Cold Rolled, Annealed, Bright |
| Titanium Wire | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V) | ASTM B863, F67 (for medical) | Diameter: 0.1mm - 8.0mm Form: Coil, Spool, Straight Length |
Welding Wire, Spring Wire, Fastener Wire, Fishing Wire | Pickled, Acid Cleaned, Polished |
| CNC Machined Parts | Gr.2, Gr.5 (Ti-6Al-4V), Gr.9, Gr.12 | ASTM B348 (Bar stock), Custom | Capability: Prototype to Mass Production Tolerance: As per customer drawing |
Flanges, Fittings, Valves, Bolts, Nuts, Custom Components Machined from billet/bar/plate |
As-machined, Sandblasted, Polished, Anodized, Bead Blasted |
