Titanium Grade 2 Square Tube Weight
Mass per metre and per foot for titanium grade 2 square 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 (26.9 lb per 20 ft).
At the reference dimensions (a = 40 mm, t = 3 mm) this section has a cross-sectional area of 444.0 mm², giving 2.002 kg/m (1.346 lb/ft). Against carbon steel's 7,850 kg/m³ that is -42.5 % — the same section in steel would be 3.485 kg/m.
Square Tube — formula and derivation
Area of a square tube
A = a² − (a − 2t)²
A = a² − (a − 2t)², which expands to A = 4t(a − t)
Worked through with the default dimensions:
A = a² − (a − 2t)²Inner side = 40 − 2 × 3 = 34.0 mmA = 40² − 34.0²A = 1600.0 − 1156.0A = 444.0 mm²
- a
- Side
- t
- Wall thickness
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 2.0024 kg/m for the reference size above.
Ti Gr 2 square tube — size series
| Side | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 |
|---|---|---|---|---|---|---|
| 15 mm | 0.365 kg/m · 0.245 lb/ft | 0.469 kg/m · 0.315 lb/ft | 0.649 kg/m · 0.436 lb/ft | 0.794 kg/m · 0.533 lb/ft | 0.902 kg/m · 0.606 lb/ft | 0.974 kg/m · 0.655 lb/ft |
| 20 mm | 0.501 kg/m · 0.336 lb/ft | 0.649 kg/m · 0.436 lb/ft | 0.920 kg/m · 0.618 lb/ft | 1.155 kg/m · 0.776 lb/ft | 1.353 kg/m · 0.909 lb/ft | 1.515 kg/m · 1.018 lb/ft |
| 25 mm | 0.636 kg/m · 0.427 lb/ft | 0.830 kg/m · 0.558 lb/ft | 1.191 kg/m · 0.800 lb/ft | 1.515 kg/m · 1.018 lb/ft | 1.804 kg/m · 1.212 lb/ft | 2.057 kg/m · 1.382 lb/ft |
| 30 mm | 0.771 kg/m · 0.518 lb/ft | 1.010 kg/m · 0.679 lb/ft | 1.461 kg/m · 0.982 lb/ft | 1.876 kg/m · 1.261 lb/ft | 2.255 kg/m · 1.515 lb/ft | 2.598 kg/m · 1.746 lb/ft |
| 40 mm | 1.042 kg/m · 0.700 lb/ft | 1.371 kg/m · 0.921 lb/ft | 2.002 kg/m · 1.346 lb/ft | 2.598 kg/m · 1.746 lb/ft | 3.157 kg/m · 2.121 lb/ft | 3.680 kg/m · 2.473 lb/ft |
| 50 mm | 1.312 kg/m · 0.882 lb/ft | 1.732 kg/m · 1.164 lb/ft | 2.544 kg/m · 1.709 lb/ft | 3.319 kg/m · 2.231 lb/ft | 4.059 kg/m · 2.728 lb/ft | 4.763 kg/m · 3.200 lb/ft |
| 60 mm | 1.583 kg/m · 1.064 lb/ft | 2.093 kg/m · 1.406 lb/ft | 3.085 kg/m · 2.073 lb/ft | 4.041 kg/m · 2.715 lb/ft | 4.961 kg/m · 3.334 lb/ft | 5.845 kg/m · 3.928 lb/ft |
| 80 mm | 2.124 kg/m · 1.427 lb/ft | 2.814 kg/m · 1.891 lb/ft | 4.167 kg/m · 2.800 lb/ft | 5.484 kg/m · 3.685 lb/ft | 6.765 kg/m · 4.546 lb/ft | 8.010 kg/m · 5.382 lb/ft |
| 100 mm | 2.665 kg/m · 1.791 lb/ft | 3.536 kg/m · 2.376 lb/ft | 5.250 kg/m · 3.528 lb/ft | 6.927 kg/m · 4.655 lb/ft | 8.569 kg/m · 5.758 lb/ft | 10.175 kg/m · 6.837 lb/ft |
Rows: side (mm). Columns: wall thickness (mm). Computed for Titanium Grade 2 at 4510 kg/m³.
| Side | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 |
|---|---|---|---|---|---|---|
| 15 mm | 81.0 | 104.0 | 144.0 | 176.0 | 200.0 | 216.0 |
| 20 mm | 111.0 | 144.0 | 204.0 | 256.0 | 300.0 | 336.0 |
| 25 mm | 141.0 | 184.0 | 264.0 | 336.0 | 400.0 | 456.0 |
| 30 mm | 171.0 | 224.0 | 324.0 | 416.0 | 500.0 | 576.0 |
| 40 mm | 231.0 | 304.0 | 444.0 | 576.0 | 700.0 | 816.0 |
| 50 mm | 291.0 | 384.0 | 564.0 | 736.0 | 900.0 | 1,056.0 |
| 60 mm | 351.0 | 464.0 | 684.0 | 896.0 | 1,100.0 | 1,296.0 |
| 80 mm | 471.0 | 624.0 | 924.0 | 1,216.0 | 1,500.0 | 1,776.0 |
| 100 mm | 591.0 | 784.0 | 1,164.0 | 1,536.0 | 1,900.0 | 2,256.0 |
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 square 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 | 3.485 | 2.342 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.419 | 2.297 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.199 | 0.806 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.190 | 0.800 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.248 | 0.838 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 3.969 | 2.667 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 3.774 | 2.536 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 3.907 | 2.626 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 2.002 | 1.346 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.197 | 2.148 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.035 | 3.383 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.622 | 0.418 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.426 | 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 square tube
Square tube expands cleanly to A = 4t(a − t), which makes the sensitivity obvious: for a given side, weight is almost exactly linear in wall thickness. Doubling a 2 mm wall to 4 mm adds about 1.9 times the mass, not twice, because the inner void shrinks as the wall grows. Its flat faces also make it the natural choice for welded frames and for anything that has to be drilled, tapped or bolted through a face — a round tube gives you only a tangent point where a square tube gives you a full flat.
Specified as side × wall thickness. Corner radii are standardised per EN 10219 and change the area slightly at heavier walls.
Download this data
Ti Gr 2 square 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 square tube weigh?
At the reference dimensions (a = 40 mm, t = 3 mm) a titanium grade 2 square tube of this size weighs 2.002 kg/m, or 1.346 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 square tube calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = a² − (a − 2t)². At the reference dimensions that gives 444.0 mm², and multiplying by titanium grade 2's density of 4,510 kg/m³ gives 2.002 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 square 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 square 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 444.0 mm² (0.6882 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 square 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 square 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 3.485 kg/m for comparison.
Other materials, same square tube
The same geometry in every material, so the only variable is density.
- Carbon steel square tube — 7850 kg/m³
- SS 304 square tube — 8000 kg/m³
- SS 316 square tube — 8000 kg/m³
- AL 6061 square tube — 2700 kg/m³
- Copper square tube — 8940 kg/m³
- Brass square tube — 8500 kg/m³
- HDPE square tube — 960 kg/m³
- PVC square 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 round tube — A = π/4 · (D² − d²), d = D − 2t
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
Square Tube area from A = a² − (a − 2t)². 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.