We manufacture heavy-duty carbon steel round tubes designed to deliver uniform stress distribution, exceptional load-bearing capacity, and reliable machinability. Full material traceability is guaranteed.
| Specification | Technical Parameters |
| Global Standards | AISI, ASTM, BS, GB |
| Structural Grades | Q195, Q215, Q235, Q235b, Q345, Q355b, A36, SS490, SM400, SM490 |
| Carbon & Alloy Grades | 10#, 20#, 45#, S25C, S35C, S45C, 65Mn |
| Marine & Commercial | A32, AH32, AH36, DH36, D32, DH32, SPHC, SPHD, SPHE, SPHF |
| Technology | Cold Rolled / Hot Rolled |
| Shape Profile | Round |
| Outer Diameter (OD) | 10 mm - 600 mm (Or highly customised) |
| Wall Thickness | 1 mm - 200 mm (Engineered for heavy-wall requirements) |
| Length | 1 meter - 12 meters (Precise cut-to-length available) |
| Surface Finish | Natural colour, iron grey, threaded ends, or anti-rust painted |
Our structural round tubes are manufactured to strict metallurgical standards, ensuring optimal yield stress for high-pressure and high-load environments. Technical data for core Q-Series grades:
| Grade | C≤ (%) | Si≤ (%) | Mn≤ (%) | P≤ (%) | S≤ (%) | Tensile Strength (MPa) | Yield Stress (MPa) | Elongation (%) |
| Q235B | 0.20 | 0.28 | 0.7 | 0.025 | 0.025 | 380 - 450 | 270 - 300 | 28 |
| Q345B | 0.20 | 0.50 | 1.6 | 0.034 | 0.025 | 550 - 600 | 380 - 450 | 25 |
| Q355B | 0.24 | 0.55 | 1.6 | 0.035 | 0.025 | 550 - 630 | 380 - 450 | 21 |
With thick wall capabilities (up to 200mm) and robust yield strengths, our carbon steel round pipes are the baseline material for:
Infrastructure Construction: Deep foundation piling, structural bridge columns, and heavy scaffolding.
Mechanical Machining: Raw material for hydraulic cylinder barrels, heavy axles, and rotational machine parts.
Fluid Transmission: High-integrity pipelines for industrial water, gas, and slurry transport.
As a direct manufacturing source, we provide scalable steel pipe supply chains for engineering contractors, OEM fabricators, and metal wholesalers worldwide. Please submit your required material grade (e.g., Q345B Round Pipe), exact dimensions (OD × Wall Thickness × Length), surface requirements (e.g., threaded ends), and total metric tonnage to receive an official factory-direct price and MOQ details.
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