Zibo Zhaotai Stainless Steel Co., Ltd.
| Trade Term | Ex-Work, FOB, CNF, CFR, CIF, Etc |
| Packaging Details | Bundle packaging and waterproof wrap, or upon negotiation |
| Delivery Time | 7-15 working days, based on order specifications |
| Payment Terms | T/T,L/C |
| Steel Grade | 201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, Etc |
| Place of Origin | China |
| Model Number | Customization |
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Product Specification
| Trade Term | Ex-Work, FOB, CNF, CFR, CIF, Etc | Packaging Details | Bundle packaging and waterproof wrap, or upon negotiation |
| Delivery Time | 7-15 working days, based on order specifications | Payment Terms | T/T,L/C |
| Steel Grade | 201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, Etc | Place of Origin | China |
| Model Number | Customization | ||
| High Light | Custom stainless steel spiral ducting ，201 stainless steel spiral ducting ，430 stainless spiral duct | ||
Our custom Stainless Steel Spiral Ducts with External Stiffening Ribs are precision-engineered to deliver superior airtightness, high crush resistance, and exceptional corrosion protection for industrial HVAC and exhaust systems. Custom-fabricated from high-grade like SS304 and SS316L stainless steel, each round duct is constructed using continuous spiral lockseam rolling integrated with external corrugated stiffening ribs, which drastically increases circumferential strength and negative pressure tolerance without adding unnecessary weight. Manufactured to tight dimensional tolerances, these smooth-interior ducts minimize airflow friction, noise, and pressure drop while resisting aggressive chemical vapors, moisture, and elevated temperatures. Ideal for factory air extraction, cleanroom HVAC systems, chemical fume exhaust, and dust collection networks, our custom stainless steel spiral ducts offer a durable, highly efficient, and low-maintenance ventilation solution strictly tailored to your engineering CAD specifications.
External Stiffening Ribs for Maximum Negative Pressure Resistance
Engineered with continuous external corrugated ribs that significantly boost pipe rigidity, allowing thinner-gauge metal to withstand high vacuum, negative air pressure, and structural loads without collapsing.
Smooth Interior Surface for Low Pressure Loss
The internal surface remains smooth and free of obstructions, drastically reducing airflow turbulence, static pressure loss, and noise generation while preventing dust accumulation inside the ducting.
Full Passivation & Extreme Chemical/Moisture Immunity
Fabricated from premium SS304/SS316L and fully pickled and passivated, offering complete protection against corrosive fumes, high humidity, grease, and harsh sanitizing chemicals without rusting.
Disclaimer & Application Scope: This product is designed exclusively for non-pressure / atmospheric applications (P≤0.1 bar). It is NOT intended, tested, or certified for pressure vessels, high-pressure steam, or hazardous pressurized fluid containment.
| Item | Specification |
| Product Type | Custom Stainless Steel Spiral Duct with External Stiffening Ribs / Spiral Seam Pipe |
| Material Grades | Stainless Steel 304 / 304L, 316 / 316L and etc. |
| Structural Profile | Continuous 4-Ply Spiral Lockseam, External Corrugated Reinforcing Ribs |
| Duct Diameter | 80mm – 2000mm+ (Customizable according to system layout) |
| Duct Length | Standard 3000mm, 6000mm or custom lengths up to 12,000mm |
| Sheet Thickness | 0.5mm – 2.0mm+ |
| Connecting Options | Male/Female Slip Joints, Companion Flanges, Quick-Release Clamps |
| Surface Finish | Pickling & Passivation, Bright Mill Finish, Industrial Sandblasting |
| CAD Drawing Support | STEP, IGES, DWG, DXF, PDF |
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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