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Special-steel pipes are high-performance, alloyed, or custom-shaped tubes designed for demanding industrial applications requiring superior strength, corrosion resistance, and durability. Unlike standard round pipes, these include specialized alloys (e.g., nickel-based, duplex) or non-circular, variable, and complex cross-sections. They are widely used in critical sectors like aerospace, automotive, shipbuilding, and chemical processing for structural support and fluid transport.
Special shape steel pipe is a kind of economic cross section steel tube including non circular cross section, equal-thickness wall, variable wall thickness, symmetrical section, no-symmetrical section, etc. Such as square, rectangle, conical, trapezoidal, spiral, etc. The special shape steel pipe is more suitable for the particular condition of use. And it can save metal and improve the labor productivity of parts and components manufacturing.
Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes other than round pipes. According to the shape and size of the steel pipe section, it can be divided into equal-wall thickness special-shaped seamless steel pipe (code D), unequal wall thickness special-shaped seamless steel pipe (code BD), variable diameter special-shaped seamless steel pipe
| Material Specification | Grade / Designation | Product Form | Size Range (Min/Max) | Heat Treatment / Condition |
|---|---|---|---|---|
| ASME SA 213/SA 213M | TP304, TP304L, TP316, TP316L, TP316Ti, TP317L, TP310S, TP321 | Seamless pipes and tubes | O.D. 6.0~426mm, W.T. 0.5~13mm | Solution treatment, pickled or polished |
| ASME SA 312/SA 312M | TP304, TP304L, TP316, TP316L, TP316Ti, TP317L, TP310S, TP321 | Seamless pipes and tubes | O.D. 6.0~426mm, W.T. 0.5~13mm | Solution treatment, pickled or polished |
| ASME SA 789/SA 789M | S31803, S32205, S32750 | Seamless pipes and tubes | O.D. 6.0~426mm, W.T. 0.5~13mm | Solution treatment, pickled or polished |
| EN 10216-5:2021 | 1.4301, 1.4306, 1.4401, 1.4404, 1.4410, 1.4438, 1.4462, 1.4541, 1.4571, 1.4845 | Seamless pipes and tubes | O.D. 6.0~426mm, W.T. 0.5~13mm | Solution treatment, pickled or polished |
Abbreviations: O.D. = Outer Diameter, W.T. = Wall Thickness
Seamless Tubes:
Seamless tubes are hollow cylindrical products made from metal with no welds or joints. They are produced by heating a solid billet, piercing it to form a tube, and then elongating it to the desired dimensions. This process ensures a uniform structure without seams, which contributes to their strength and reliability.
Seamless Pipes:
Seamless pipes are similar in that they are made from metal without welding, but they are specifically designed for transporting fluids, gases, and other materials. The production process is similar to that of seamless tubes, but the final product is often tailored to handle higher pressures and different environmental conditions.
