ERW / Seamless Pipes
What are ERW / Seamless Pipes?
ERW Pipes are manufactured by welding steel strips longitudinally, while Seamless Pipes are produced from solid billets, offering superior strength and pressure handling. Both types ensure excellent corrosion resistance, uniformity, and long service life.
Asiad Steel Industries is a leading manufacturer and exporter of high-quality ERW (Electric Resistance Welded) Pipes and Seamless Pipes, catering to a wide range of industrial applications. These pipes are available in multiple grades, diameters, and thicknesses to meet the demands of industrial sectors.
Key Features
High
Strength
Durable
Construction
Smooth
Surface Finish
Wide
Compatibility
Corrosion
Resistant
Types of ERW / Seamless Pipes
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Sizes | ½″ to 24″ (DN15 – DN600) for round; customized sizes for square & rectangular |
| Custom Sizes | Available on request for structural & architectural use | |
| Pipe Types | Round Pipes | OD: 21.3 mm – 610 mm; Thickness: 2 mm – 40 mm |
| Square Pipes | 20×20 mm – 300×300 mm; Thickness: 1.5 mm – 25 mm | |
| Rectangular Pipes | 40×20 mm – 400×200 mm; Thickness: 1.5 mm – 25 mm | |
| Slotted Pipes | OD: 25 mm – 300 mm; Slot Width: 0.5 mm – 2 mm (customized) | |
| Polished Pipes | Available in Round, Square, Rectangular; Mirror & Satin Finish (Ra ≤ 0.2 µm) | |
| Manufacturing Process | ERW Pipes | Electric Resistance Welded as per IS 1239 / IS 3589 / ASTM A53 |
| Seamless Pipes | Hot Finished & Cold Drawn as per ASTM A106 / A335 / DIN 17175 | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A106 Gr. B, API 5L Gr. B / X42 / X52 | |
| Alloy Steel | ASTM A335 P1, P5, P9, P11, P22 | |
| Standards & Tolerances | Indian Standards | IS 1239, IS 3589, IS 4923 |
| International Standards | ASTM A312, A213, A106, API 5L, DIN EN 10219 | |
| Dimensional Tolerances | OD ±0.5%, Thickness ±10%, Length: Single/Double/Random | |
| Surface Finish | As-Manufactured | Black, Mill Finish, Pickled & Oiled |
| Coated & Polished | Hot-Dip Galvanized, Electro-Polished, Mirror Finish | |
| End Connections | Options | Plain End (PE), Beveled End (BE), Threaded End (NPT/BSPT), Grooved |
| Testing & Certification | Mechanical & NDT | Hydrostatic Test, Eddy Current, Ultrasonic, Flattening/Drift Test |
| Certification | EN 10204 3.1/3.2, IBR (for boiler tubes), CE, ISO 9001 |
ERW Pipe Standard Size
| NB Size | OD (mm) | 5S | 10S | S10 | S20 | 40S | S40 | S60 | XS/80S | S80 | S100 | S120 | S140 | S160 | XXS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/8” | 10.29 | – | 1.2 | – | – | – | 1.73 | – | – | 2.41 | – | – | – | – | – |
| 1/4” | 13.72 | – | 1.7 | – | – | – | 2.24 | – | – | 3.02 | – | – | – | – | – |
| 3/8” | 17.15 | – | 1.7 | – | – | – | 2.31 | – | – | 3.2 | – | – | – | – | 15 |
| 1/2” | 21.34 | 1.7 | 2.1 | – | – | 2.8 | 2.77 | – | 3.73 | 3.73 | – | – | – | 4.78 | 7.47 |
| 1 1/2” | 48.26 | 1.7 | 2.8 | – | – | 3.7 | 3.68 | – | 5.08 | 5.08 | – | – | – | 7.14 | 10.2 |
| 2” | 60.33 | 1.7 | 2.8 | – | – | 3.9 | 3.91 | – | 5.54 | 5.54 | – | – | – | 9.74 | 11.1 |
| 2 1/2” | 73.03 | 2.1 | 3.1 | – | – | 5.2 | 5.16 | – | 7.01 | 7.01 | – | – | – | 9.53 | 14 |
| 3” | 88.9 | 2.1 | 3.1 | – | – | 5.5 | 5.49 | – | 7.62 | 7.62 | – | – | – | 11.1 | 15.2 |
| 3 1/2” | 101.6 | 2.1 | 3.1 | – | – | 5.7 | 5.74 | – | 8.08 | 8.08 | – | – | – | – | – |
| 4” | 114.3 | 2.1 | 3.1 | – | – | 6 | 6.02 | – | 8.56 | 8.56 | – | 11.1 | – | 13.5 | 17.1 |
| 5” | 141.3 | 2.8 | 3.4 | – | – | 6.6 | 6.55 | – | 9.53 | 9.53 | – | 12.7 | – | 15.9 | 19.1 |
| 3/4” | 26.67 | 1.7 | 2.1 | – | – | 2.9 | 2.87 | – | 3.91 | 3.91 | – | – | – | 5.56 | 7.82 |
| 1” | 33.4 | 1.7 | 2.8 | – | – | 3.4 | 3.38 | – | 4.55 | 4.55 | – | – | – | 6.35 | 9.09 |
| 1 1/4” | 42.16 | 1.7 | 2.8 | – | – | 3.6 | 3.56 | – | 4.85 | 4.85 | – | – | – | 6.35 | 9.7 |
| 6” | 168.3 | 2.8 | 3.4 | – | – | 7.1 | 7.11 | – | 10.97 | 11 | – | 14.3 | – | 18.3 | 22 |
| 12” | 323.9 | 4 | 4.6 | – | 6.4 | 9.5 | 10.3 | 14.3 | 12.7 | 17.5 | 21.4 | 25.4 | 28.6 | 33.3 | 25.4 |
| 10” | 273.1 | 3.4 | 4.2 | – | 6.4 | 9.3 | 9.27 | 12.7 | 12.7 | 15.1 | 19.3 | 21.4 | 25.4 | 28.6 | 25.4 |
| 26” | 660.4 | – | – | 7.9 | 13 | 9.5 | – | – | 12.7 | – | – | – | – | – | – |
| 28” | 711.2 | – | – | 7.9 | 13 | 9.5 | – | – | 12.7 | – | – | – | – | – | – |
| 34” | 863.6 | – | – | 7.9 | 13 | 9.5 | 17.5 | – | 12.7 | – | – | – | – | – | – |
| 14” | 355.6 | 4 | 4.8 | 6.4 | 7.9 | 9.5 | 11.1 | 15.1 | 12.7 | 19.1 | 23.8 | 27.8 | 31.8 | 35.7 | – |
| 30” | 762 | 6.4 | 7.9 | 7.9 | 13 | 9.5 | – | – | 12.7 | – | – | – | – | – | – |
ERW Pipe Wall Thickness
| DN | Out Diameter | A series | B series | Sch 5s | Sch 10s | Sch 20s | LG | Sch 20 | Sch 30 | STD | Sch 40 | Sch 60 | XS | Sch 80 | Sch 100 | Sch 120 | Sch 140 | Sch 180 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 32 | 42.4 | 38 | 1.6 | 1.6 | 1.6 | 2.8 | 3.2 | – | 3.2 | – | – | 3.6 | 3.6 | 4.0 | – | – | 5.0 | – |
| 40 | 48.3 | 45 | 1.6 | 1.6 | 2.8 | 3.2 | 3.2 | – | 3.6 | 3.6 | 4.0 | – | – | 5.0 | 5.6 | – | – | – |
| 50 | 60.3 | 57 | 1.6 | 2.8 | 3.2 | 3.6 | – | – | 3.6 | 4.0 | – | – | – | 5.6 | – | – | 6.3 | 7.1 |
| 65 | 76.1 | 76 | 2.0 | 2.0 | 2.0 | 3.0 | 3.6 | 4.0 | – | – | 4.5 | 4.5 | 4.5 | – | 5.0 | 5.6 | 5.6 | 7.1 |
| 80 | 88.9 | 89 | 2.0 | 3.0 | 3.0 | 3.6 | 4.0 | 4.0 | – | – | 4.5 | 4.5 | 4.5 | 5.6 | 7.1 | 8.0 | 8.0 | 10.0 |
| 90 | 101.6 | – | 2.0 | 3.0 | 4.0 | 4.0 | 4.5 | 6.3 | – | – | 6.3 | 6.3 | 7.1 | 8.0 | 8.8 | – | – | 10.0 |
| 100 | 114.3 | 108 | 2.0 | 3.0 | 3.4 | 4.0 | 5.0 | 5.0 | – | – | 5.0 | 5.6 | – | 5.9 | 6.3 | 7.1 | – | 8.8 |
| 125 | 139.7 | 133 | 2.9 | 3.4 | 5.0 | 5.0 | – | 5.0 | 6.3 | 6.3 | – | 6.3 | 7.1 | 8.0 | 8.8 | – | 8.8 | 10.0 |
| 150 | 168.3 | 159 | 2.9 | 3.4 | 5.6 | 6.3 | 6.3 | – | 6.3 | 7.1 | 8.0 | 8.8 | – | 8.0 | 8.8 | 10.0 | 10.0 | 12.5 |
| 200 | 219.1 | 219 | 2.9 | 4.0 | 4.0 | 4.5 | 6.3 | 6.3 | 6.3 | – | – | 6.3 | 7.1 | 8.0 | 8.8 | – | 8.0 | 8.8 |
| 250 | 273.0 | 273 | 3.6 | 4.0 | 4.0 | 6.3 | 6.3 | 6.3 | – | – | 6.3 | 6.3 | 7.1 | 8.0 | 8.8 | – | 10.0 | 10.0 |
| 300 | 323.9 | 325 | 4.0 | 4.5 | 6.3 | 6.3 | 6.3 | 7.1 | 8.0 | 8.8 | – | – | 8.0 | 8.8 | 10.0 | 10.0 | 12.5 | 14.2 |
ERW Pipe Chemical Composition
| Element | SS 304 / SS 304L | SS 316 / SS 316L |
|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 10.0 – 14.0 |
| Carbon (C) | 0.08 (304) / 0.03 (304L) | 0.08 (316) / 0.03 (316L) |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance |
| Molybdenum (Mo) | — | 2.0 – 3.0 |
ERW Pipe Schedule Chart
| Nominal Pipe Size (NPS) | Schedule 10 | Schedule 20 | Schedule 40 | Schedule 80 |
|---|---|---|---|---|
| 2″ | 0.154″ | 0.218″ | 0.370″ | 0.450″ |
| 12″ | 0.406″ | 0.687″ | 1.200″ | 1.320″ |
| 2-1/2″ | 0.203″ | 0.276″ | 0.432″ | 0.552″ |
| 10″ | 0.365″ | 0.593″ | 1.050″ | 1.200″ |
| 24″ | 0.625″ | 1.125″ | 2.000″ | 2.250″ |
| 3/4″ | 0.113″ | 0.154″ | 0.216″ | 0.300″ |
| 1-1/4″ | 0.140″ | 0.191″ | 0.274″ | 0.375″ |
| 4″ | 0.237″ | 0.337″ | 0.600″ | 0.800″ |
| 18″ | 0.562″ | 0.875″ | 1.700″ | 1.900″ |
| 14″ | 0.437″ | 0.750″ | 1.400″ | 1.500″ |
| 1″ | 0.133″ | 0.179″ | 0.244″ | 0.322″ |
| 1-1/2″ | 0.145″ | 0.200″ | 0.300″ | 0.400″ |
| 1/2″ | 0.109″ | 0.147″ | 0.205″ | 0.254″ |
| 16″ | 0.500″ | 0.875″ | 1.500″ | 1.750″ |
| 6″ | 0.280″ | 0.432″ | 0.840″ | 1.050″ |
| 20″ | 0.593″ | 1.000″ | 1.800″ | 2.000″ |
| 3″ | 0.216″ | 0.300″ | 0.500″ | 0.600″ |
| 5″ | 0.258″ | 0.375″ | 0.700″ | 0.900″ |
| 8″ | 0.322″ | 0.500″ | 0.900″ | 1.100″ |
Applications of ERW / Seamless Pipes
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the primary difference between ERW and Seamless Pipes?
Which applications prefer Seamless Pipes over ERW?
Do you supply NACE/MR0175 compliant pipes?
Are mill test certificates provided with your pipes?
