Our round steel pipe range covers cold-formed and hot-finished options, electric resistance welded (ERW) and seamless manufacturing methods, and a full selection of carbon steel, alloy steel, and stainless steel grades. Whether you need standard structural pipe for a building project, high-pressure line pipe for fluid transport, or precision mechanical tubing for machinery, YS STEEL can provide mill test certificates, third-party inspection, and custom cutting or coating services.
YS STEEL manufactures and stocks Round Steel Pipes with the following primary parameters:
All dimensions and tolerances follow the applicable standard unless a specific customer specification is provided. YS STEEL can also produce non-standard intermediate sizes with short lead times because we maintain multiple production lines and a large raw material inventory.
The table below shows common nominal pipe sizes (NPS), outside diameters, and wall thickness schedules available from YS STEEL. The weight per meter is based on carbon steel with a density of 7.85 g/cm³. Actual weights may vary slightly depending on the manufacturing standard.
| Nominal Size (NPS) | Outside Diameter (mm) | Schedule / Wall Thickness (mm) | Weight per Meter (kg/m) |
|---|---|---|---|
| 1/2 inch | 21.3 | 2.77 (SCH 40) | 1.27 |
| 3/4 inch | 26.7 | 2.87 (SCH 40) | 1.69 |
| 1 inch | 33.4 | 3.38 (SCH 40) | 2.50 |
| 1-1/4 inch | 42.2 | 3.56 (SCH 40) | 3.39 |
| 1-1/2 inch | 48.3 | 3.68 (SCH 40) | 4.05 |
| 2 inch | 60.3 | 3.91 (SCH 40) | 5.44 |
| 2-1/2 inch | 73.0 | 5.16 (SCH 40) | 8.63 |
| 3 inch | 88.9 | 5.49 (SCH 40) | 11.29 |
| 4 inch | 114.3 | 6.02 (SCH 40) | 16.07 |
| 6 inch | 168.3 | 7.11 (SCH 40) | 28.26 |
| 8 inch | 219.1 | 8.18 (SCH 40) | 42.55 |
| 10 inch | 273.0 | 9.27 (SCH 40) | 60.31 |
| 12 inch | 323.8 | 10.31 (SCH 40) | 79.71 |
| 16 inch | 406.4 | 12.70 (SCH 40) | 123.30 |
| 20 inch | 508.0 | 15.09 (SCH 40) | 183.42 |
| 24 inch | 609.6 | 17.48 (SCH 40) | 255.20 |
YS STEEL also supplies round steel pipe in Schedule 10, Schedule 20, Schedule 30, Schedule STD, Schedule XS, Schedule 80, Schedule 120, Schedule 160, and XXS. Wall thickness ranges from 0.8 mm for light-gauge mechanical tubing up to 60 mm for heavy-wall structural and line pipe applications. For exact weights for a specific outside diameter and wall thickness, our sales engineers can provide a detailed calculation based on the formula: weight per meter (kg/m) = (OD – WT) × WT × 0.02466, where OD and WT are in millimeters.
The chemical composition of round steel pipe directly affects weldability, strength, corrosion resistance, and low-temperature toughness. YS STEEL supplies round steel pipe with the following typical chemical ranges for our most frequently ordered carbon steel grades. Values are in weight percent unless otherwise noted.
| Grade | C max | Mn max | P max | S max | Si max | Other |
|---|---|---|---|---|---|---|
| ASTM A500 Grade B | 0.26 | 1.35 | 0.035 | 0.035 | 0.05 | Cu min 0.20 when required |
| ASTM A53 Grade B | 0.30 | 1.20 | 0.05 | 0.045 | — | Cu max 0.40, Ni max 0.40, Cr max 0.40, Mo max 0.15 |
| API 5L Grade B | 0.28 | 1.20 | 0.030 | 0.030 | — | CE max 0.43 |
| API 5L X52 | 0.28 | 1.40 | 0.030 | 0.030 | — | V+Nb+Ti max 0.15; CE max 0.43 |
| EN 10219 S355J2H | 0.22 | 1.60 | 0.035 | 0.035 | 0.55 | N max 0.012; CEV max 0.45 |
| Q355B | 0.20 | 1.60 | 0.035 | 0.035 | 0.55 | Cr max 0.30, Ni max 0.30, Cu max 0.30 |
Stainless steel round pipe grades such as 304 and 316L are available with controlled chromium and nickel content for enhanced corrosion resistance in food processing, chemical, and marine environments. YS STEEL can supply full chemical analysis reports for every heat number, and we welcome third-party testing by SGS, BV, TUV, or Intertek.
Mechanical performance is critical when selecting round steel pipe for structural, pressure, or mechanical applications. The following table lists the minimum or typical mechanical properties for common round steel pipe grades supplied by YS STEEL.
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) min | Impact Test |
|---|---|---|---|---|
| ASTM A500 Grade B | 290 min | 400 min | 18 | Not required |
| ASTM A53 Grade B | 240 min | 415 min | 22 | Not required |
| API 5L Grade B | 245 min | 415 min | 22 | Optional at low temp |
| API 5L X52 | 360 min | 460 min | 21 | Required for PSL2 |
| EN 10219 S355J2H | 355 min | 470–630 | 20 | 27 J at -20°C |
| Q355B | 355 min | 470–630 | 20 | 27 J at 20°C |
YS STEEL performs tensile testing, flattening testing, flaring testing, bend testing, hydrostatic testing, and Charpy impact testing when required by the standard or customer specification. For seamless round steel pipe used in high-pressure service, we recommend API 5L PSL2 or ASTM A106 Grade C, which provides higher yield strength and stricter toughness requirements.
Different market segments and applications require round steel pipe produced to different standards. YS STEEL maintains production and stock across the following major categories:
Every YS STEEL round steel pipe shipment includes a mill test certificate that states the exact standard, steel grade, heat number, chemical composition, mechanical test results, and dimensional inspection data. For projects requiring traceability, we retain complete production records for a minimum of 10 years.
Dimensional tolerance is one of the most common reasons for rejected pipe shipments. YS STEEL applies strict tolerance control at every stage of production. Typical tolerances for Round Steel Pipes are as follows:
Our quality control process includes incoming billet or coil inspection, in-line ultrasonic testing for ERW welds, eddy current testing for seamless pipe, hydrostatic testing up to 30 MPa, visual and dimensional inspection, and random destructive testing from each production batch. YS STEEL also offers full third-party inspection before shipment, and we can arrange loading supervision to ensure the product you approve is the product that arrives at your job site.
Round Steel Pipes can be supplied in various surface conditions depending on the end use and environmental exposure. YS STEEL provides the following options:
All coating processes are monitored for adhesion, thickness, and holiday detection. YS STEEL can arrange both internal and external coating for round steel pipe used in water transmission, piling, and chemical processing.
Because of its uniform geometry, high strength-to-weight ratio, and excellent torsional resistance, round steel pipe is specified in a wide array of projects. YS STEEL regularly supplies Round Steel Pipes for:
YS STEEL’s engineering team can recommend the most suitable standard, grade, and surface finish for your specific load conditions, operating temperature, pressure, and corrosion environment. We maintain detailed technical data sheets for each product family and can provide a free sample upon request for approved buyers.
