Structural steel pipes are robust tubes used for structural support in construction. They are made from carbon or alloy steel, available in various dimensions and shapes, and can be seamless or welded. These pipes are known for their high load-bearing capacity and are commonly used in buildings, bridges, and industrial applications. They may undergo surface treatments for enhanced durability and meet industry standards for quality.
API 5L/ASTM A106 GR.B
| 公称通径 DN | 外径 OD(mm) | SCH40(6m/5.8m) | SCH40(6m/5.8m) | SCH40(6m/5.8m) |
| 壁厚WT | 壁厚WT | 壁厚WT | ||
| (mm) | (mm) | (mm) | ||
| 1/4” | 13.7 | 2.24 | 3.02 | / |
| 3/8” | 17.1 | 2.31 | 3.2 | / |
| 1/2” | 21.3 | 2.77 | 3.73 | 4.78 |
| 3/4” | 26.7 | 2.87 | 3.91 | 5.56 |
| 1” | 33.4 | 3.38 | 4.55 | 6.35 |
| 1-1/4” | 42.2 | 3.56 | 4.85 | 6.35 |
| 1-1/2” | 48.3 | 3.68 | 5.08 | 7.14 |
| 2” | 60.3 | 3.91 | 5.54 | 8.74 |
| 2-1/2” | 73 | 5.16 | 7.01 | 9.53 |
| 3″ | 88.9 | 5.49 | 7.62 | 11.13 |
| 3-1/2” | 101.6 | 5.74 | 8.08 | / |
| 4” | 114.3 | 6.02 | 8.56 | 13.49 |
| 5” | 141.3 | 6.55 | 9.53 | 15.88 |
| 6” | 168.3 | 7.11 | 10.97 | 18.26 |
| 8” | 219.1 | 8.18 | 12.7 | 23.01 |
| 10″ | 273 | 9.27 | 15.09 | 28.58 |
| 12” | 323.8 | 10.31 | 17.48 | 33.32 |
| 14” | 355.6 | 9.53 | 11.13 | 19.05 |
| 16” | 406.4 | 9.53 | 12.7 | 21.44 |
| 18” | 457 | 9.53 | 14.27 | 23.83 |
| 20” | 508 | 9.53 | 15.09 | 26.19 |
| 24” | 610 | 9.53 | 17.48 | 30.96 |
Structural Steel Pipe Chemical Composition & Mechanical Properties
| Standard | Grade | Chemical Composition (%) | Mechanical Properties | |||||
| ASTM A53 | C | Si | Mn | P | S | Tensile STrength(Mpa) | Yield STrength(Mpa) | |
| A | ≤0.25 | – | ≤0.95 | ≤0.05 | ≤0.06 | ≥330 | ≥205 | |
| B | ≤0.30 | – | ≤1.2 | ≤0.05 | ≤0.06 | ≥415 | ≥240 | |
| ASTM A106 | A | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥415 | ≥240 |
| B | ≤0.35 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥485 | ≥275 | |
| ASTM A179 | A179 | 0.06-0.18 | – | 0.27-0.63 | ≤0.035 | ≤0.035 | ≥325 | ≥180 |
| ASTM A192 | A192 | 0.06-0.18 | ≤0.25 | 0.27-0.63 | ≤0.035 | ≤0,035 | ≥325 | ≥180 |
| API 5L PSL1 | A | 0.22 | – | 0.90 | 0.030 | 0.030 | ≥331 | ≥207 |
| B | 0.28 | – | 1.20 | 0.030 | 0.030 | ≥414 | ≥241 | |
| X42 | 0.28 | – | 1.30 | 0.030 | 0.030 | ≥414 | ≥290 | |
| X46 | 0.28 | – | 1.40 | 0.030 | 0.030 | ≥434 | ≥317 | |
| X52 | 0.28 | – | 1.40 | 0.030 | 0.030 | ≥455 | ≥359 | |
| X56 | 0.28 | – | 1.40 | 0.030 | 0.030 | ≥490 | ≥386 | |
| X60 | 0.28 | 1.40 | 0.030 | 0.030 | ≥517 | ≥448 | ||
| X65 | 0.28 | – | 1.40 | 0.030 | 0.030 | ≥531 | ≥448 | |
| X70 | 0.28 | – | 1.40 | 0.030 | 0.030 | ≥565 | ≥483 | |
| API 5L PSL2 | B | 0.24 | – | 1.20 | 0.025 | 0.015 | ≥414 | ≥241 |
| X42 | 0.24 | – | 1.30 | 0.025 | 0.015 | ≥414 | ≥290 | |
| X46 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥434 | ≥317 | |
| X52 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥455 | ≥359 | |
| X56 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥490 | ≥386 | |
| X60 | 0.24 | 1.40 | 0.025 | 0.015 | ≥517 | ≥414 | ||
| X65 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥531 | ≥448 | |
| X70 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥565 | ≥483 | |
| X80 | 0.24 | – | 1.40 | 0.025 | 0.015 | ≥621 | ≥552 | |
Structural steel pipe chemical composition and mecchaial properties
| Standard | Grade | Chemical Composition | Mechanical Properties | |||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation(%) | ||
| GB/T8163 | 10 | 0.07- 0.14 | 0.17- 0.37 | 0.25- 0.65 | <0.035 | <0.035 | <0.15 | <0.25 | <0.25 | 335-457 | ≥205 | ≥24 |
| 20 | 0.17- 0.24 | 0.17- 0.37 | 0.35- 0.65 | <0.035 | <0.035 | <0.25 | <0.25 | <0.25 | 410-550 | ≥245 | ≥20 | |
| Q345 | 0.12- 0.20 | 0.20- 0.55 | 1.20- 1.60 | <0.045 | <0.045 | – | – | – | 490-665 | ≥325 | ≥21 | |
Structural Steel Pipe Tolerance
| Pipe types | Pipe Szie(mm) | Tolerances | |
| Hot rolled | OD | All | ±1% (min +0.50mm) |
| WT | All | +15%, -12.5% | |
| Cold drawn | OD | 6~10 | ±0.20mm |
| 10-30 | ±0.40mm | ||
| 30-50 | ±0.45mm | ||
| >50 | ±1% | ||
| WT | <1 | ±0.15mm | |
| >1-3 | +15% -10% | ||
| >3 | +12.5%-10% | ||
Structural Steel Pipe End
| Plain End | Wall Thickness less than 0.5 inch, including SCH STD & SCH XS | ||
| Plain End (Square Cut) | Wall Thickness over 0.5 inch, including SCH XXS | ||
| Beveled End | Wall Thickness less than 0.5 inch, including SCH STD & SCH XS | ||
| Couplings | Outside Diameter equal or less than 2″ | ||
| Thread Protection | Outside Diameter over 4 inch | ||
Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packaged either in bundles or in bulk, the ends are sealed with plastic caps and wrapped in waterproof paper.
We are capable of manufacturing structural pipes in various sizes, adhering to European, Chinese, American, and Japanese standards. Our production offers swift delivery and flexible payment terms. Stringent control measures are in place throughout all stages of tube production to ensure high-quality standards. Every tube undergoes thorough inspection prior to shipment, and we also welcome third-party inspections before delivery.
Structural Steel Pipe Classification and Application
| Types | Application | |
| Structure Purposes | General structure and mechanical | |
| Liquid Services | Petroleum, gas and other fluids conveying | |
| Low and Medium Pressure | Steam and boiler manufacturing | |
| Hydraulic Pillar Service | Hydraulic support | |
| Auto Semi-shaft Casing | Auto sem-shaft casing | |
| Line Pipe | Oil and gas conveying | |
| Tubing and Casing | Oil and gas conveying | |
| Drill Pipes | Well drilling | |
| Geological Drilling Pipe | Geological drilling | |
| Petroleum Cracking Tubes | Furnace tubes, heat exchangers | |