Zibo Zhaotai Stainless Steel Co., Ltd.
| Outer Diameter | > 12 inches (approx. 325 mm) up to 118 inches (approx. 3000 mm) |
| Standard Length | 6m (20 ft), custom lengths available up to 12m (40 ft) |
| Steel Grade | 201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, Etc |
| Delivery Time | 7 working days, based on order specifications. |
| Payment Terms | L/C,T/T |
| Surface Finish | Mill Finish, Not Polished. Available Surface Finishes: Polishing, Sandblasting, Brushed, Embossing, Painting, Etc. |
| Wall Thickness | 1.0 mm to 70.0 mm (or custom) |
| Trade Term | Ex-Work, FOB, CNF, CFR, CIF, Etc |
| Packaging Details | Tie the reinforcement, or upon negotiation |
| Model Number | Customization |
| Place of Origin | China |
| Certification | AISI, ASTM, GB, DIN, BS, JIS |
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Product Specification
| Outer Diameter | > 12 inches (approx. 325 mm) up to 118 inches (approx. 3000 mm) | Standard Length | 6m (20 ft), custom lengths available up to 12m (40 ft) |
| Steel Grade | 201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, Etc | Delivery Time | 7 working days, based on order specifications. |
| Payment Terms | L/C,T/T | Surface Finish | Mill Finish, Not Polished. Available Surface Finishes: Polishing, Sandblasting, Brushed, Embossing, Painting, Etc. |
| Wall Thickness | 1.0 mm to 70.0 mm (or custom) | Trade Term | Ex-Work, FOB, CNF, CFR, CIF, Etc |
| Packaging Details | Tie the reinforcement, or upon negotiation | Model Number | Customization |
| Place of Origin | China | Certification | AISI, ASTM, GB, DIN, BS, JIS |
| High Light | welded round pipe hollow ，large diameter stainless steel round tube ，hollow stainless steel round tube | ||
[Welded] Stainless Steel Large Diameter Welded Round Pipe, hollow cylindrical product
Stainless steel large diameter welded round pipe is a hollow cylindrical product made by forming a flat stainless steel plate or coil into a circular shape and welding the longitudinal seam. "Large diameter" typically refers to pipes with an outer diameter exceeding 300 mm, with common sizes ranging from 300 mm to 2,500 mm or larger.
Large diameter welded round pipes offer a cost-effective alternative to seamless pipes, especially for big projects. They provide excellent corrosion resistance, high strength, and a wide range of available sizes. They can also be customized in length, with standard sections up to 12 meters.
The production begins with a stainless steel coil that is unwound, leveled, and trimmed to the required width. The flat strip is then progressively bent into a cylindrical shape using a series of forming rollers. Zhaotai offers multiple welding processes to meet customer needs, including submerged arc welding, laser welding, plasma welding, and manual welding.
After welding, the pipe passes through sizing rollers to achieve precise diameter and straightness. It may then undergo heat treatment to restore corrosion resistance and relieve welding stresses. Finally, the pipe is inspected using non-destructive testing methods, cut to length, and finished as required.
201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, etc.
Mill Finish, Not Polished.
Available surface finishes: polishing, sandblasting, brushed, embossing, painting, etc. Please contact us for inquiries.
Cutting, Bending, Stamping, Welding, CNC machining, etc. Please contact us for inquiries.
| Industry | Specific Applications |
|---|---|
| Construction & Architecture | Structural columns, bridge components, stadium roof supports, building frameworks |
| Water & Wastewater | Large-diameter water transmission lines, sewage treatment plant piping, penstocks |
| Oil & Gas | Pipeline systems, flow lines, gathering lines, offshore risers |
| Chemical & Petrochemical | Process piping, reactor shells, storage tank components, heat exchanger shells |
| Marine & Offshore | Seawater intake lines, offshore platform structures, shipbuilding components |
| Power Generation | Cooling water lines, penstocks for hydroelectric plants, flue gas ducting |
| Mining & Industrial | Slurry pipelines, tailings lines, ventilation ducts, material handling systems |
| Infrastructure | Culverts, tunnel liners, bridge piers, port and harbor structures |
| Food & Beverage | Large-diameter sanitary process lines, storage tank shells |
| Custom Fabrication | Pressure vessels, large-diameter ducting, special-purpose tanks and silos |
Stainless steel can be magnetic depending on its internal structure. Austenitic grades like 304 and 316 are normally non-magnetic, but ferritic (430) and martensitic (410) grades are magnetic due to their different crystal structure. Even 304 or 316 may become slightly magnetic after cold working such as bending or stamping, which transforms some austenite into martensite. Therefore, magnetism does not indicate quality — it simply reflects the steel's microstructure and processing history.
For standard materials and sizes held in stock, delivery is guaranteed within 3 days of payment receipt. For products requiring custom dimensions or surface finishes, the lead time is 7 to 15 working days after payment confirmation. Specific delivery schedules should be confirmed with customer service at the time of order placement.
A substantial inventory is maintained to ensure prompt delivery. Stock availability varies by material grade and dimensions. To avoid potential delays, please confirm current stock levels with your sales representative prior to placing an order.
Applicable product standards must be specified at the time of order. For projects with specific technical requirements, please provide detailed parameters, tolerance ranges, and other relevant specifications. A dedicated quality inspection department oversees all stages of production to ensure full compliance. Upon completion, accurate measurements, inspection images, video documentation, and material test reports are provided for customer confirmation.
Complimentary samples are available in any size; however, international shipping fees apply. These charges are deductible from future order payments following formal cooperation. Customized samples are also available for a fee. For further details, please consult your sales representative.
Custom markings on outer packaging are available upon request at no additional cost. Once the marking design is approved, it will be affixed using waterproof tape. If no specific marking is requested, packaging will be shipped without markings by default.
Material grade, dimensions, and other identifying information may be spray-marked directly onto the steel plate surface upon request. For applicable charges, please consult your sales representative.
Standard wooden pallet packaging is provided at no extra cost, with a loading capacity of 1 to 3 tons per pallet. Alternative packaging options, such as iron pallets, are available upon request. Please contact your sales representative for details — bulk orders qualify for preferential pricing.
We maintain partnerships with multiple freight forwarders to offer competitive land, air, and sea freight options. If you have a preferred freight forwarder, we can arrange delivery to your agent's warehouse or to the designated port of shipment.
Factory inspections and product inspections are fully supported. Customers are welcome to visit our facility for in-person inspections. Alternatively, third-party inspection agencies, including SGS, may be arranged to conduct on‑site inspections.
Company Details
Business Type:
Manufacturer
Year Established:
2006
Total Annual:
30,000,000-40,000,000
Employee Number:
60~100
Ecer Certification：
Verified Supplier
Our Company: Zhaotai is a China-based international factory specializing in stainless steel products from 2006. With annual domestic distribution exceeding 30,000 tons, the company has established a reliable supply capacity and a stable sourcing network. Building on this strong domestic foundation, ... Our Company: Zhaotai is a China-based international factory specializing in stainless steel products from 2006. With annual domestic distribution exceeding 30,000 tons, the company has established a reliable supply capacity and a stable sourcing network. Building on this strong domestic foundation, ...
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