Titanium Grade 2 Round Tube Weight
Mass per metre and per foot for titanium grade 2 round tube at 4,510 kg/m³ (ASTM B265 / B348 (UNS R50400)). Every figure is for the section as drawn. A 6 m length of this size weighs 12.0 kg (26.8 lb per 20 ft).
At the reference dimensions (D = 50 mm, t = 3 mm) this section has a cross-sectional area of 443.0 mm², giving 1.998 kg/m (1.342 lb/ft). Against carbon steel's 7,850 kg/m³ that is -42.5 % — the same section in steel would be 3.477 kg/m.
Round Tube — formula and derivation
Area of a round tube
A = π/4 · (D² − d²), d = D − 2t
A = π/4 × (D² − d²), where D is the outside diameter, d the inside diameter, and d = D − 2t for wall thickness t
Worked through with the default dimensions:
A = π/4 × (D² − d²)d = 50 − 2 × 3 = 44.0 mmA = 0.785398 × (50² − 44.0²)A = 0.785398 × 564.0A = 443.0 mm²
- D
- Outside diameter
- t
- Wall thickness — Must be less than half the outside diameter.
Weight follows from the area with no further geometry: m = A × 10⁻⁶ × ρ, where A is in mm², ρ in kg/m³ and m in kg/m. At 4,510 kg/m³ that is 1.9978 kg/m for the reference size above.
Ti Gr 2 round tube — size series
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.156 kg/m · 0.105 lb/ft | 0.223 kg/m · 0.150 lb/ft | 0.283 kg/m · 0.190 lb/ft | 0.383 kg/m · 0.257 lb/ft | 0.453 kg/m · 0.305 lb/ft | 0.496 kg/m · 0.333 lb/ft | 0.510 kg/m · 0.343 lb/ft | 0.453 kg/m · 0.305 lb/ft |
| 16 mm | 0.213 kg/m · 0.143 lb/ft | 0.308 kg/m · 0.207 lb/ft | 0.397 kg/m · 0.267 lb/ft | 0.553 kg/m · 0.371 lb/ft | 0.680 kg/m · 0.457 lb/ft | 0.779 kg/m · 0.524 lb/ft | 0.850 kg/m · 0.571 lb/ft | 0.907 kg/m · 0.609 lb/ft |
| 20 mm | 0.269 kg/m · 0.181 lb/ft | 0.393 kg/m · 0.264 lb/ft | 0.510 kg/m · 0.343 lb/ft | 0.723 kg/m · 0.486 lb/ft | 0.907 kg/m · 0.609 lb/ft | 1.063 kg/m · 0.714 lb/ft | 1.190 kg/m · 0.800 lb/ft | 1.360 kg/m · 0.914 lb/ft |
| 25 mm | 0.340 kg/m · 0.229 lb/ft | 0.499 kg/m · 0.336 lb/ft | 0.652 kg/m · 0.438 lb/ft | 0.935 kg/m · 0.628 lb/ft | 1.190 kg/m · 0.800 lb/ft | 1.417 kg/m · 0.952 lb/ft | 1.615 kg/m · 1.085 lb/ft | 1.927 kg/m · 1.295 lb/ft |
| 32 mm | 0.439 kg/m · 0.295 lb/ft | 0.648 kg/m · 0.436 lb/ft | 0.850 kg/m · 0.571 lb/ft | 1.233 kg/m · 0.828 lb/ft | 1.587 kg/m · 1.066 lb/ft | 1.913 kg/m · 1.285 lb/ft | 2.210 kg/m · 1.485 lb/ft | 2.720 kg/m · 1.828 lb/ft |
| 40 mm | 0.553 kg/m · 0.371 lb/ft | 0.818 kg/m · 0.550 lb/ft | 1.077 kg/m · 0.724 lb/ft | 1.573 kg/m · 1.057 lb/ft | 2.040 kg/m · 1.371 lb/ft | 2.480 kg/m · 1.666 lb/ft | 2.890 kg/m · 1.942 lb/ft | 3.627 kg/m · 2.437 lb/ft |
| 50 mm | 0.694 kg/m · 0.467 lb/ft | 1.031 kg/m · 0.693 lb/ft | 1.360 kg/m · 0.914 lb/ft | 1.998 kg/m · 1.342 lb/ft | 2.607 kg/m · 1.752 lb/ft | 3.188 kg/m · 2.142 lb/ft | 3.741 kg/m · 2.514 lb/ft | 4.761 kg/m · 3.199 lb/ft |
| 63 mm | 0.878 kg/m · 0.590 lb/ft | 1.307 kg/m · 0.878 lb/ft | 1.729 kg/m · 1.162 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.344 kg/m · 2.247 lb/ft | 4.109 kg/m · 2.761 lb/ft | 4.846 kg/m · 3.256 lb/ft | 6.234 kg/m · 4.189 lb/ft |
| 76 mm | 1.063 kg/m · 0.714 lb/ft | 1.583 kg/m · 1.064 lb/ft | 2.097 kg/m · 1.409 lb/ft | 3.103 kg/m · 2.085 lb/ft | 4.081 kg/m · 2.742 lb/ft | 5.030 kg/m · 3.380 lb/ft | 5.951 kg/m · 3.999 lb/ft | 7.708 kg/m · 5.179 lb/ft |
| 89 mm | 1.247 kg/m · 0.838 lb/ft | 1.860 kg/m · 1.250 lb/ft | 2.465 kg/m · 1.657 lb/ft | 3.655 kg/m · 2.456 lb/ft | 4.817 kg/m · 3.237 lb/ft | 5.951 kg/m · 3.999 lb/ft | 7.056 kg/m · 4.741 lb/ft | 9.181 kg/m · 6.170 lb/ft |
| 114 mm | 1.601 kg/m · 1.076 lb/ft | 2.391 kg/m · 1.607 lb/ft | 3.174 kg/m · 2.133 lb/ft | 4.718 kg/m · 3.170 lb/ft | 6.234 kg/m · 4.189 lb/ft | 7.722 kg/m · 5.189 lb/ft | 9.181 kg/m · 6.170 lb/ft | 12.015 kg/m · 8.074 lb/ft |
| 168 mm | 2.366 kg/m · 1.590 lb/ft | 3.539 kg/m · 2.378 lb/ft | 4.704 kg/m · 3.161 lb/ft | 7.013 kg/m · 4.713 lb/ft | 9.295 kg/m · 6.246 lb/ft | 11.547 kg/m · 7.759 lb/ft | 13.772 kg/m · 9.254 lb/ft | 18.136 kg/m · 12.187 lb/ft |
Rows: outside diameter (mm). Columns: wall thickness (mm). Computed for Titanium Grade 2 at 4510 kg/m³.
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 34.6 | 49.5 | 62.8 | 84.8 | 100.5 | 110.0 | 113.1 | 100.5 |
| 16 mm | 47.1 | 68.3 | 88.0 | 122.5 | 150.8 | 172.8 | 188.5 | 201.1 |
| 20 mm | 59.7 | 87.2 | 113.1 | 160.2 | 201.1 | 235.6 | 263.9 | 301.6 |
| 25 mm | 75.4 | 110.7 | 144.5 | 207.3 | 263.9 | 314.2 | 358.1 | 427.3 |
| 32 mm | 97.4 | 143.7 | 188.5 | 273.3 | 351.9 | 424.1 | 490.1 | 603.2 |
| 40 mm | 122.5 | 181.4 | 238.8 | 348.7 | 452.4 | 549.8 | 640.9 | 804.2 |
| 50 mm | 153.9 | 228.6 | 301.6 | 443.0 | 578.1 | 706.9 | 829.4 | 1,055.6 |
| 63 mm | 194.8 | 289.8 | 383.3 | 565.5 | 741.4 | 911.1 | 1,074.4 | 1,382.3 |
| 76 mm | 235.6 | 351.1 | 465.0 | 688.0 | 904.8 | 1,115.3 | 1,319.5 | 1,709.0 |
| 89 mm | 276.5 | 412.3 | 546.6 | 810.5 | 1,068.1 | 1,319.5 | 1,564.5 | 2,035.8 |
| 114 mm | 355.0 | 530.1 | 703.7 | 1,046.2 | 1,382.3 | 1,712.2 | 2,035.8 | 2,664.1 |
| 168 mm | 524.6 | 784.6 | 1,043.0 | 1,555.1 | 2,060.9 | 2,560.4 | 3,053.6 | 4,021.2 |
Area is a property of the geometry alone, so this table is the same for every material. It is what you enter into a stress calculation; the mass table is what you enter into an order.
Each row is one nominal size. Because the area is computed from your dimensions rather than read from a mill table, a non-standard size is just as accurate — put it into the calculator above rather than interpolating between rows.
The same round tube in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Titanium Grade 2 is highlighted. The percentage column is against carbon steel, which is the figure most quotations are built on.
| Material | Density kg/m³ | lb/in³ | Mass / length kg/m | lb/ft | vs carbon steel |
|---|---|---|---|---|---|
| Carbon Steel | 7,850 | 0.2836 | 3.477 | 2.337 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.411 | 2.292 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.196 | 0.804 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.187 | 0.798 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.245 | 0.836 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 3.960 | 2.661 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 3.765 | 2.530 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 3.898 | 2.619 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 1.998 | 1.342 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.189 | 2.143 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.023 | 3.375 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.620 | 0.417 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.425 | 0.286 | -87.8 % |
Same geometry throughout, so the only variable is density. Carbon steel is highlighted as the baseline.
A note on using this table for costing: mass is not price. Aluminium is roughly a third of steel's mass here, but per kilogram it costs several times more, so a straight swap rarely saves money — what it buys is reduced load on a structure or a vehicle.
About titanium grade 2
Commercially pure titanium, the workhorse corrosion grade rather than the aerospace high-strength one. Density 4,510 kg/m³ gives it 57 % of steel’s mass with a comparable tensile strength, which is the headline — but titanium’s real advantage in chemical plant is a passive oxide film that survives chlorides, wet chlorine and oxidising acids that destroy stainless. It is expensive enough that the mass change is a secondary concern to the corrosion allowance it lets you remove.
- Density
- 4,510 kg/m³ = 0.1629 lb/in³ · 0.5745× carbon steel · typical spread ±1 %
- Specification
- ASTM B265 / B348 (UNS R50400)
- Equivalents
- EN 3.7035 · JIS 2H · GB TA2
- Typical uses
- Chemical process heat exchangers · Desalination and marine · Medical implants · Anodised architectural panels
Poor machinability — low thermal conductivity causes heat to concentrate at the cutting edge. Titanium is also combustible as fine swarf.
About round tube
Hollow sections are the most efficient way to buy stiffness by weight, and the numbers are stark: a 50 mm outside diameter tube with a 3 mm wall has the same area as a 22.6 mm solid bar — about 20 % of the mass — but its second moment of area is roughly 2.4 times larger. The catch is local: a thin wall buckles and dents long before it yields, so tube is chosen for stiffness and stability, never for where impact or crushing is expected.
Specified as outside diameter × wall thickness. State the standard (e.g. EN 10219) and whether the tube is welded or seamless.
Download this data
Ti Gr 2 round tube — CSV
Both buttons below read the tables rendered on this page, so the file matches what you are looking at. The full catalogue — all 16 materials across all 10 sections — is on the downloads page.
Fields are quoted per RFC 4180, with a UTF-8 byte-order mark so Excel reads the mm² and · characters correctly. Blank lines separate the weight matrix from the area matrix.
Frequently asked questions
How much does titanium grade 2 round tube weigh?
At the reference dimensions (D = 50 mm, t = 3 mm) a titanium grade 2 round tube of this size weighs 1.998 kg/m, or 1.342 lb/ft. The table above lists the figure for every standard size so you can read your size directly instead of scaling.
How is the weight of round tube calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = π/4 · (D² − d²), d = D − 2t. At the reference dimensions that gives 443.0 mm², and multiplying by titanium grade 2's density of 4,510 kg/m³ gives 1.998 kg/m. Nothing is looked up in a table — which is why a non-standard size is calculated just as accurately as a standard one.
Why does titanium grade 2 weigh more or less than steel?
It is lighter than carbon steel for the same section — about 43 % lighter at 4,510 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a round tube of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 0.5745× carbon steel.
What is the cross-sectional area of a round tube?
The area depends only on the dimensions, not on the material, so it is identical whichever material you select: at the reference dimensions it is 443.0 mm² (0.6866 in²). That is the number you would enter into a stress or deflection calculation, and it is why changing material on this page never changes the area column.
Does a ti gr 2 round tube weigh the same as a ti gr 2 part of a different shape?
No, and the difference is larger than most people expect. At equal nominal size, a square bar is 27.3 % heavier than a round bar, and a hollow section is typically 60–80 % lighter than the solid bar it replaces. Weight follows area, and area changes faster than dimensions do — which is exactly why this needs calculating rather than estimating.
Should I use Ti Gr 2 weight or carbon steel weight for costing?
Use the material you are actually buying. At 4,510 kg/m³ against carbon steel's 7,850 kg/m³, the same round tube differs by 42.5 % in mass. On a per-metre quote that is invisible; on a fabricated tonnage it is the difference between a margin and a loss. This page computes the steel figure as 3.477 kg/m for comparison.
Other materials, same round tube
The same geometry in every material, so the only variable is density.
- Carbon steel round tube — 7850 kg/m³
- SS 304 round tube — 8000 kg/m³
- SS 316 round tube — 8000 kg/m³
- AL 6061 round tube — 2700 kg/m³
- Copper round tube — 8940 kg/m³
- Brass round tube — 8500 kg/m³
- HDPE round tube — 960 kg/m³
- PVC round tube — 1400 kg/m³
Other Ti Gr 2 sections
The same density applied to every shape the site covers.
- Ti Gr 2 round bar — A = π/4 · d²
- Ti Gr 2 square bar — A = a²
- Ti Gr 2 hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- Ti Gr 2 flat bar — A = w · t
- Ti Gr 2 plate — A = w · t
- Ti Gr 2 square tube — A = a² − (a − 2t)²
Reference data and tools
- Metal weight overview — how the calculation works
- All 16 materials — densities and specifications
- All 10 sections — formulas and size series
- Density chart — lightest to heaviest
- Metal weight calculator — any size, any material
- All calculators — metal weight and pipe weight
- Download the data — CSV, generated from the same source
- Cross-reference tables — DN / NPS / material equivalents
- Methodology and sources — where every number comes from
Round Tube area from A = π/4 · (D² − d²), d = D − 2t. Mass computed as area × length × density at 4,510 kg/m³ (ASTM B265 / B348 (UNS R50400)). No weight on this page is copied from a published table — which is why figures can differ in the last significant digit from a mill's chart calculated at a nominal density.
- Elementary plane geometry. The circle, polygon and hollow-section area formulas.
- ASTM material specifications for each grade named in the material entry (A36, A240/A276, B209/B211/B221, B152/B16/B505, B265/B348, A48, B29, D1784, D3350).
- BIPM / NIST definitional constants: international inch = 25.4 mm, foot = 0.3048 m, pound = 0.45359237 kg.
Dataset version 2026.09.1 · dimensions last verified against source 2026-09-21. Found an error? Report it — corrections are issued with a version bump.