We manufacture and export square seamless tubes made from stainless steel and alloy grades. Precision-cut, corrosion-resistant, and customizable—ideal for structural, architectural, and industrial use.
As a trusted manufacturer of square seamless tubes in China, we specialize in producing high-strength, corrosion-resistant square tubing for applications across architecture, construction, machinery frames, and structural supports. Our square seamless tubes are crafted from premium stainless steel and alloy materials using cold-drawn or hot-rolled processing to ensure dimensional accuracy and exceptional durability.
We support full customization for size, wall thickness, and surface finish to meet your engineering or design needs. With an experienced technical team and strict quality control, we deliver consistent product quality backed by international standards like ASTM, EN, and ISO certifications.
| Item | Details |
| Product Name | Stainless Steel Pipe, Stainless Pipe, SS Pipe |
| Standard | GB, AISI, ASTM,ASME,DIN, EN, JIS |
| Available Grades | 200 Series: 201, 202300 Series: TP304, 304L, 304H, 316, 316L, 316H, 316Ti, 317, 317L, 310S, 310H, 321, 321H, 347, 347HSpecial Alloys: 904L, S31254 (254SMO)400 Series: 409, 410S, 416, 420, 430, 439, 440, 444, 446Duplex and Others: 2205, 2507, S31803, S32205, S32750, S32760, 253MA |
| Process | Hot Rolled, Cold Rolled |
| Sizes | Thickness: 0.24–3mm, Outer diameter: 8–219mm, Length: 1–6m (according to customer’s request) |
| Surface Treatment | NO.1, 2B, NO.4, BA, HL, Mirror |
| Inspection | SGS, TUV, BV, ABS, LR etc. |
| Application | Oil & Gas, Petroleum, Vessels, Ship Building, Water Treatment and Environmental Protection etc. |
| Finish | Description | Typical Thickness (mm) | Available Widths (mm) |
| 2B | Smooth, reflective grey sheen. Most widely used. | 0.55 | 914, 1219 |
| BA | Bright annealed mirror-like finish. | 0.70 | 914, 1219 |
| DP | Brushed, non-reflective, easy to clean. | 0.90 | 750, 914, 1219 |
| HR | Scaled, hot-rolled finish. | 1.20 | 750–1500 |
| No.1 | Pickled, white surface after hot-rolling. | 1.50 | 914, 1219, 1500 |
| HL | Continuous linear polish finish. | 1.60 | 914, 1219, 1500 |
| No.4 | Polished with 150–180 grit. | 2.00 | 914, 1219, 1500 |
| No.8 | Mirror finish, highly reflective. | 2.50 | 914, 1219, 1500 |
Our square seamless tubes are primarily provided in hollow square form, with precise outer dimensions and clean internal surfaces. We offer customized tube sizes ranging from small-section square pipes for mechanical parts to large square tubing for load-bearing structures. Surface options include polished, pickled, satin-brushed, and mill finishes. Ends can be plain, beveled, or machined upon request.
We are a trusted manufacturer and supplier of 202 stainless steel tubes, offering custom sizes, durable finishes, and excellent high-temperature resistance. Ideal for handrails, decorative structures, and industrial use.
High-performance 2507 super duplex stainless steel tube with excellent corrosion resistance, high strength, and low thermal expansion. Ideal for seawater and chemical processing. OEM customization available from certified Chinese factory.
High-performance 321 stainless steel tubes from China wholesale manufacturer. Titanium-stabilized alloy ideal for high-temperature and corrosion-resistant applications. Available in various shapes and custom specifications.
Popular materials include stainless steel grades like 304, 316, 321, and duplex options like 2205. We also offer 904L and high-strength alloys upon request.
Seamless tubes have no welded seam, providing better uniformity, higher strength, and improved corrosion resistance, especially in high-pressure or critical applications.
Yes. We offer made-to-order sizing and surface finishes, including mirror polish, pickled, or sandblasted, depending on your end use.
These tubes are commonly used in construction, transportation, marine, petrochemical, and decorative structures, where both appearance and strength are important.
Lead time depends on the order size and customization. For standard sizes, delivery can be made within 7–15 days. We offer flexible MOQ for stocked items.
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