SpecBase

Stainless Steel 430 Round Tube Weight

Mass per metre and per foot for stainless steel 430 round tube at 7,700 kg/m³ (ASTM A240 (UNS S43000)). Every figure is for the section as drawn. A 6 m length of this size weighs 20.5 kg (45.8 lb per 20 ft).

Mass / length
3.411kg/m
2.292 lb/ft
Cross-section
443.0mm²
0.6866 in²
Reference size
50 × 3mm
D, t
Density
7,700kg/m³
0.2782 lb/in³
6 m / 20 ft length
20.5kg
45.8 lb

At the reference dimensions (D = 50 mm, t = 3 mm) this section has a cross-sectional area of 443.0 mm², giving 3.411 kg/m (2.292 lb/ft). Against carbon steel's 7,850 kg/m³ that is -1.9 % — the same section in steel would be 3.477 kg/m.

Calculate your own dimensions → Pipe and hollow sections

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 7,700 kg/m³ that is 3.4108 kg/m for the reference size above.

SS 430 round tube — size series

SS 430 round tube — mass per unit length (kg/m · lb/ft)
Outside diameter 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0
12 mm 0.266 kg/m · 0.179 lb/ft 0.381 kg/m · 0.256 lb/ft 0.484 kg/m · 0.325 lb/ft 0.653 kg/m · 0.439 lb/ft 0.774 kg/m · 0.520 lb/ft 0.847 kg/m · 0.569 lb/ft 0.871 kg/m · 0.585 lb/ft 0.774 kg/m · 0.520 lb/ft
16 mm 0.363 kg/m · 0.244 lb/ft 0.526 kg/m · 0.354 lb/ft 0.677 kg/m · 0.455 lb/ft 0.943 kg/m · 0.634 lb/ft 1.161 kg/m · 0.780 lb/ft 1.330 kg/m · 0.894 lb/ft 1.451 kg/m · 0.975 lb/ft 1.548 kg/m · 1.040 lb/ft
20 mm 0.460 kg/m · 0.309 lb/ft 0.671 kg/m · 0.451 lb/ft 0.871 kg/m · 0.585 lb/ft 1.234 kg/m · 0.829 lb/ft 1.548 kg/m · 1.040 lb/ft 1.814 kg/m · 1.219 lb/ft 2.032 kg/m · 1.365 lb/ft 2.322 kg/m · 1.560 lb/ft
25 mm 0.581 kg/m · 0.390 lb/ft 0.853 kg/m · 0.573 lb/ft 1.113 kg/m · 0.748 lb/ft 1.597 kg/m · 1.073 lb/ft 2.032 kg/m · 1.365 lb/ft 2.419 kg/m · 1.626 lb/ft 2.758 kg/m · 1.853 lb/ft 3.290 kg/m · 2.211 lb/ft
32 mm 0.750 kg/m · 0.504 lb/ft 1.107 kg/m · 0.744 lb/ft 1.451 kg/m · 0.975 lb/ft 2.105 kg/m · 1.414 lb/ft 2.709 kg/m · 1.821 lb/ft 3.266 kg/m · 2.194 lb/ft 3.774 kg/m · 2.536 lb/ft 4.645 kg/m · 3.121 lb/ft
40 mm 0.943 kg/m · 0.634 lb/ft 1.397 kg/m · 0.939 lb/ft 1.838 kg/m · 1.235 lb/ft 2.685 kg/m · 1.804 lb/ft 3.483 kg/m · 2.341 lb/ft 4.233 kg/m · 2.845 lb/ft 4.935 kg/m · 3.316 lb/ft 6.193 kg/m · 4.161 lb/ft
50 mm 1.185 kg/m · 0.797 lb/ft 1.760 kg/m · 1.183 lb/ft 2.322 kg/m · 1.560 lb/ft 3.411 kg/m · 2.292 lb/ft 4.451 kg/m · 2.991 lb/ft 5.443 kg/m · 3.657 lb/ft 6.386 kg/m · 4.291 lb/ft 8.128 kg/m · 5.462 lb/ft
63 mm 1.500 kg/m · 1.008 lb/ft 2.232 kg/m · 1.500 lb/ft 2.951 kg/m · 1.983 lb/ft 4.354 kg/m · 2.926 lb/ft 5.709 kg/m · 3.836 lb/ft 7.015 kg/m · 4.714 lb/ft 8.273 kg/m · 5.559 lb/ft 10.644 kg/m · 7.152 lb/ft
76 mm 1.814 kg/m · 1.219 lb/ft 2.703 kg/m · 1.817 lb/ft 3.580 kg/m · 2.406 lb/ft 5.298 kg/m · 3.560 lb/ft 6.967 kg/m · 4.681 lb/ft 8.588 kg/m · 5.771 lb/ft 10.160 kg/m · 6.827 lb/ft 13.160 kg/m · 8.843 lb/ft
89 mm 2.129 kg/m · 1.430 lb/ft 3.175 kg/m · 2.133 lb/ft 4.209 kg/m · 2.828 lb/ft 6.241 kg/m · 4.194 lb/ft 8.225 kg/m · 5.527 lb/ft 10.160 kg/m · 6.827 lb/ft 12.047 kg/m · 8.095 lb/ft 15.675 kg/m · 10.533 lb/ft
114 mm 2.733 kg/m · 1.837 lb/ft 4.082 kg/m · 2.743 lb/ft 5.419 kg/m · 3.641 lb/ft 8.055 kg/m · 5.413 lb/ft 10.644 kg/m · 7.152 lb/ft 13.184 kg/m · 8.859 lb/ft 15.675 kg/m · 10.533 lb/ft 20.513 kg/m · 13.784 lb/ft
168 mm 4.040 kg/m · 2.715 lb/ft 6.042 kg/m · 4.060 lb/ft 8.031 kg/m · 5.397 lb/ft 11.974 kg/m · 8.046 lb/ft 15.869 kg/m · 10.663 lb/ft 19.715 kg/m · 13.248 lb/ft 23.513 kg/m · 15.800 lb/ft 30.964 kg/m · 20.807 lb/ft

Rows: outside diameter (mm). Columns: wall thickness (mm). Computed for Stainless Steel 430 at 7700 kg/m³.

Round Tube — cross-sectional area (mm²)
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.

How to read this table

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. Stainless Steel 430 is highlighted. The percentage column is against carbon steel, which is the figure most quotations are built on.

Round Tube at D = 50 mm, t = 3 mm — mass in every material
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 stainless steel 430

A ferritic straight-chromium grade — 17 % Cr, essentially no nickel — and therefore magnetic. Its 7,700 kg/m³ makes it the lightest of the stainless family here, a 1.9 % saving against 304 and the only stainless that undercuts carbon steel on mass. That, plus a nickel-free price, is why it dominates appliance trim, kitchen splashbacks and interior decorative panels where corrosion demand is mild and a magnet will be used on it anyway.

Density
7,700 kg/m³ = 0.2782 lb/in³ · 0.9809× carbon steel · typical spread ±1 %
Specification
ASTM A240 (UNS S43000)
Equivalents
EN 1.4016 · JIS SUS430 · GB 10Cr17
Typical uses
Appliance and kitchen panels · Interior decorative trim · Automotive exhaust trim · Elevator cladding
Weight-relevant caution

Ferritic grades have lower ductility and weldability than 304; avoid specifying it for formed or welded structural work.

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.

When ordering

Specified as outside diameter × wall thickness. State the standard (e.g. EN 10219) and whether the tube is welded or seamless.

Download this data

SS 430 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.

All materials (CSV · 16 × 10 pages)

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 stainless steel 430 round tube weigh?

At the reference dimensions (D = 50 mm, t = 3 mm) a stainless steel 430 round tube of this size weighs 3.411 kg/m, or 2.292 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 stainless steel 430's density of 7,700 kg/m³ gives 3.411 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 stainless steel 430 weigh more or less than steel?

It is lighter than carbon steel for the same section — about 2 % lighter at 7,700 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 0.9809× 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 ss 430 round tube weigh the same as a ss 430 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 SS 430 weight or carbon steel weight for costing?

Use the material you are actually buying. At 7,700 kg/m³ against carbon steel's 7,850 kg/m³, the same round tube differs by 1.9 % 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.

Other SS 430 sections

The same density applied to every shape the site covers.

Reference data and tools

Data source and method

Round Tube area from A = π/4 · (D² − d²), d = D − 2t. Mass computed as area × length × density at 7,700 kg/m³ (ASTM A240 (UNS S43000)). 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.