Pipes & Tubes · ASTM A554 / EN 10219
Square Tube — ASTM A554 / EN 10219
Square tube — square hollow section. Square tube is used for frames, handrails, architecture and structures.
- ASTM A554 / EN 10219
- 20 grades
- EN 10204 3.1 / 3.2
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Square Tube: What to Know Before Ordering
- Square hollow section
- Polished or mill finish
- Cut lengths
Square Tube Materials & Grades
| Grade | Material standard | Best for |
|---|---|---|
| Inconel 825 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| SS 304 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | General corrosion resistance, food, water and architectural work |
| SS 304L square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Welded tanks, piping and vessels in general corrosive service |
| SS 310 / 310S square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Furnaces, burners and heat treatment at high temperature |
| SS 316 / 316L square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 321 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | High-temperature service between 425 and 815 °C |
| SS 347 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Welded high-temperature piping in refineries and power plants |
| Duplex 2205 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Seawater and high-chloride service where strength also matters |
| Inconel 600 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | High-temperature oxidation, caustic and nuclear service |
| Inconel 625 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Seawater, high strength and high temperature in one alloy |
| Inconel 718 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Very high strength at temperatures up to about 650 °C |
| Incoloy 800 / 800H / 800HT square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Furnaces, petrochemical heaters and high-temperature piping |
| Hastelloy C276 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | The most aggressive mixed acids, wet chlorine and hypochlorite |
| Hastelloy C22 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Mixed oxidising and reducing acids, and weld overlays |
| Monel 400 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Seawater, hydrofluoric acid and marine service |
| Super Duplex S32760 square tube | ASTM A554 (ornamental) · A312 / A790 for pressure | Seawater firewater, injection and offshore piping |
| S275JR square tube | EN 10219 square & rectangular sections | General structures, frames and fabrication |
| S355J2+N square tube | EN 10219 square & rectangular sections | Heavy structures, cranes and offshore frames |
Other pipes & tubes
Square tube — questions buyers ask
What finishes are available on square tube?
Mill finish, 180–320 grit polish and hairline, depending on grade.
Which grades are square tubes available in?
Inconel 825, SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347, Duplex 2205, Super Duplex 2507, Inconel 600, Inconel 625, Inconel 718, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400, Super Duplex S32760, S275JR, S355J2+N.
Which standard covers square tube dimensions?
ASTM A554 / EN 10219. The material standard depends on the grade.
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