ASTM B337 Titanium Tube
This ASTM B337 titanium tube covers eight grades(gr1, gr2, gr3, gr7, gr9, gr10, gr11 and gr12) of seamless and welded titanium tube intended for general corrosion-resisting and elevated-temperature service.
Product Introduction
ASTM B337 covers seamless and welded titanium and titanium alloy pipes intended for general corrosion-resistant and elevated-temperature service.
Titanium pipes manufactured under this specification may be produced using seamless or welded processes, provided that the final product meets the mechanical, chemical, and dimensional requirements of the standard.
Manufacturing Methods
Seamless Pipes
Titanium pipes may be manufactured using any seamless process, including:
Hot extrusion
Cold rolling
Cold drawing
These processes must produce pipes that comply with ASTM B337 requirements.
Welded Pipes
Titanium pipes may also be manufactured from flat-rolled titanium plates or sheets using arc welding.
Requirements include:
Welding filler metal, if used, must be the same grade as the base metal.
For Grades 2 and 3, the filler metal may also be the next lower strength grade.
For Grades 7, 9, 10, 11, and 12, the filler metal must be the same grade as specified.
Welded pipes may be further cold worked after welding to achieve final dimensions.
Heat Treatment Condition
Titanium pipes shall be supplied in the following conditions:
| Grade | Condition |
|---|---|
| Grade 1–3 | Annealed |
| Grade 7 | Annealed |
| Grade 9 | Annealed or Stress-Relief Annealed |
| Grade 10 | Solution Treated |
| Grade 12 | Annealed |
Mechanical Properties
| Grade | Tensile Strength (Min) | Yield Strength (Min) | Elongation |
|---|---|---|---|
| ksi | MPa | ksi | |
| 1 | 35 | 240 | 25 |
| 2 | 50 | 345 | 40 |
| 3 | 65 | 450 | 55 |
| 7 | 50 | 345 | 40 |
| 9 | 90 | 620 | 70 |
| 12 | 70 | 483 | 50 |
Chemical Composition (Max %)
| Grade | N | C | H | Fe | O | Al | V | Ti | Other |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 0.03 | 0.08 | 0.015 | 0.20 | 0.18 | - | - | Bal | 0.40 |
| 2 | 0.03 | 0.08 | 0.015 | 0.30 | 0.25 | - | - | Bal | 0.40 |
| 3 | 0.05 | 0.08 | 0.015 | 0.30 | 0.35 | - | - | Bal | 0.40 |
| 7 | 0.03 | 0.08 | 0.015 | 0.30 | 0.25 | - | - | Bal | 0.40 |
| 9 | 0.03 | 0.08 | 0.015 | 0.25 | 0.15 | 2.5–3.5 | 2.0–3.0 | Bal | 0.40 |
| 12 | 0.03 | 0.08 | 0.015 | 0.30 | 0.25 | - | - | Bal | 0.40 |
Dimensional Tolerances
| Nominal Diameter | Permissible Variation |
|---|---|
| 3.2 – 38 mm | +0.397 / −0.794 mm |
| 38 – 102 mm | ±0.794 mm |
| 102 – 203 mm | +1.588 / −0.794 mm |
| 203 – 305 mm | +2.382 / −0.794 mm |
Surface and Quality Requirements
Finished ASTM B337 titanium pipes shall:
Be reasonably straight
Have smooth ends
Be free from burrs
Be free from harmful internal and external defects
Minor surface defects may be removed provided dimensional tolerances are maintained.
Unless otherwise specified, pipes shall be supplied free of scale.
Temperature Performance
Titanium alloys maintain good mechanical properties at elevated temperatures.
Titanium alloys can operate at temperatures up to 450–500°C.
They retain higher specific strength compared with aluminum alloys at elevated temperatures.
Aluminum alloys generally experience significant strength reduction above 150–200°C, while titanium maintains structural integrity over a wider temperature range.
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