Square Pipes
What are Square Pipes?
Square pipes are hollow structural sections with four equal sides, used extensively in structural, architectural, and mechanical applications. Their geometric shape offers high load-bearing strength and ease of installation in welded and bolted assemblies.
Asiad Steel Industries supplies a full range of ERW and Seamless Square Pipes in stainless steel, carbon steel, and alloy grades across various industries and global standards.
Key Features
High
Strength
Durable
Construction
Smooth
Surface Finish
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | 20×20 mm to 500×500 mm (custom sizes available) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 |
| PN Ratings | PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 |
| Pipe Types | ERW Square Pipe | Electric Resistance Welded, standard wall thickness |
| Seamless Square Pipe | Seamless manufacturing, high-pressure applications | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A500 Grade B, ASTM A36, ASTM A53 | |
| Alloy / Superalloy | Alloy Steel (A234 WP1, WP5, WP9, WP11, WP22, WP91), Inconel 600/625/825 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Monel 400/K500, Nickel 200/201, Titanium (Grade 2, Grade 5) | |
| Standards & Certifications | ASME / ANSI | ASME B36.10 (CS), ASME B36.19 (SS) |
| ASTM | ASTM A500, ASTM A513, ASTM A182, ASTM A269 | |
| European Standards | EN 10219, EN 10210 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Wall Thickness | As per standard EN 10219 / ASTM A500, customized options available |
| End Connections | Plain Ends, Beveled Ends | |
| Tolerance | As per ASME / EN / ASTM standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide, Hot-Dip Galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Machined, Pickled, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions
| NPS (in) | DN (mm) | OD (mm) | Schedule 10 | Schedule 20 | Schedule 40 | Schedule 80 | Approx. Weight (kg/m) (Sch 40) |
|---|---|---|---|---|---|---|---|
| ½” | 15 | 21.3 | 2.77 | 2.87 | 3.73 | 5.49 | 2.77 |
| ¾” | 20 | 26.7 | 2.87 | 2.87 | 3.91 | 5.49 | 3.57 |
| 1″ | 25 | 33.4 | 2.87 | 3.38 | 4.55 | 6.02 | 5.01 |
| 1¼” | 32 | 42.2 | 3.38 | 3.56 | 4.85 | 6.02 | 6.67 |
| 1½” | 40 | 48.3 | 3.38 | 3.68 | 5.08 | 6.35 | 8.11 |
| 2″ | 50 | 60.3 | 3.56 | 3.91 | 5.54 | 7.11 | 11.1 |
| 2½” | 65 | 73 | 3.91 | 4.19 | 6.02 | 7.62 | 14.7 |
| 3″ | 80 | 88.9 | 4.19 | 4.55 | 6.55 | 8.56 | 19.1 |
| 4″ | 100 | 114.3 | 4.55 | 4.85 | 7.11 | 9.27 | 27.2 |
| 5″ | 125 | 139.7 | 4.85 | 5.08 | 7.62 | 9.53 | 36.9 |
| 6″ | 150 | 168.3 | 5.08 | 5.49 | 8.18 | 10.97 | 49.0 |
| 8″ | 200 | 219.1 | 5.54 | 6.02 | 9.27 | 12.70 | 73.5 |
| 10″ | 250 | 273 | 6.02 | 6.55 | 11.13 | 15.09 | 104 |
| 12″ | 300 | 323.9 | 6.35 | 7.11 | 12.70 | 17.48 | 134 |
| 14″ | 350 | 355.6 | 6.35 | 7.11 | 14.27 | 19.05 | 164 |
| 16″ | 400 | 406.4 | 7.11 | 7.62 | 15.09 | 20.64 | 203 |
| 18″ | 450 | 457 | 7.62 | 8.18 | 16.66 | 23.01 | 250 |
| 20″ | 500 | 508 | 8.18 | 8.56 | 17.48 | 24.99 | 300 |
| 24″ | 600 | 610 | 9.27 | 9.27 | 19.05 | 27.94 | 411 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 415 – 750 | MPa (Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Titanium) |
| Yield Strength | 170 – 550 | MPa |
| Hardness | 120 – 220 | HB (Brinell) |
| Elongation | ≥ 18 – 30 | % |
| Density | 7.7 – 8.4 | g/cm³ |
| Impact Toughness | ≥ 25 – 75 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~105 – 200 | GPa |
| Fatigue Strength | 250 – 450 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel > Duplex / Titanium) | – |
| Thermal Conductivity | 15 – 90 | W/m·K |
| Coefficient of Thermal Expansion | 6 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.35 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.33 | – |
| Brinell Hardness Range | 120 – 220 | HB |
| Surface Finish | Pickled, Polished, Passivated | – |
| Welding Type | ERW (Electric Resistance Welded) / Seamless | – |
| Operating Temperature Range | -50 to 600 | °C (material-dependent) |
| Pressure Rating | PN6 – PN64 / Class 150 – 2500 | ASME / ISO Standards |
Applications of Square Pipes
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Are square pipes only used structurally?
Can square pipes be cut to specific lengths?
Are seamless square pipes available?
What’s the surface finish of stainless steel square pipes?
