Large Diameter Stainless Steel Welded Pipe 304 / 316L Acid And Alkali Resistant
Price:
Negotiable (Request a Quote)
MOQ:
100kg
Delivery Time:
15-25days
Brand:
Baosteel，TISCO
Product Description
Large Diameter Stainless Steel Welded Pipe 304/316L
Large diameter stainless steel welded pipe is typically defined as pipe with an outer diameter exceeding 16 inches (406 mm). These pipes are manufactured by roll-forming stainless steel coils or plates into tubular shapes, followed by longitudinal welding, using processes such as SAW (Submerged Arc Welding) or LSAW (Longitudinal Submerged Arc Welding) for diameters up to 3000mm.
Unlike seamless pipes, which are extruded from solid billets, large-diameter welded pipes offer superior cost-effectiveness, uniform wall thickness, and excellent corrosion resistance. The weld seam, when properly heat-treated, provides mechanical properties and corrosion resistance comparable to the base metal, making it suitable for demanding industrial applications.
Key Features
- Large OD Range – Available from 108mm to 3000mm (DN100 to DN2000)
- Multiple Grades – 304/304L, 316/316L, duplex, super austenitic, nickel alloys
- High Corrosion Resistance – Austenitic structure with chromium content 16-20%
- Cost-Effective – 20-30% lower cost than seamless alternatives
- Full Traceability – MTR provided with heat number traceable
- Global Standards – ASTM A312, EN 10217-7, JIS G3468
Product Specifications
| Parameter | Details |
|---|---|
| Product Name | Large Diameter Stainless Steel Welded Pipe |
| Applicable Standards | ASTM A312, EN 10217-7, JIS G3468, GB/T 12771 |
| Material Grades | 304, 304L, 316, 316L, 321, 347, 904L, duplex (2205/2507) |
| Manufacturing Type | Welded (LSAW / SSAW / ERW) |
| OD Range | 108mm – 3000mm (DN100 – DN2000) |
| Wall Thickness Range | 2mm – 30mm (custom up to 101mm available) |
| Length | 6m fixed length, or cut to size (up to 15m) |
| Surface Finish | Pickled, annealed, blasted, polished |
| End Finish | Plain ends, beveled ends (for welding), grooved |
Common Dimensions (Round Pipe)
| Nominal Bore DN | OD (mm) | Common WT (mm) | Schedule |
|---|---|---|---|
| DN100 | 101.6 / 108 | 2.0-4.0 | Sch10S-40S |
| DN150 | 159.0 / 168 | 2.5-5.0 | Sch10S-40S |
| DN200 | 219.0 | 3.0-6.0 | Sch10S-80S |
| DN250 | 273.0 | 4.0-8.0 | Sch10S-80S |
| DN300 | 325.0 | 4.0-10.0 | Sch20S-80S |
| DN350 | 355.6 / 377 | 5.0-10.0 | Sch20S-80S |
| DN400 | 406.4 / 426 | 5.0-12.0 | Sch20S-80S |
| DN500 | 508.0 / 530 | 6.0-12.0 | Sch30S-80S |
| DN600 | 609.6 / 630 | 6.0-14.0 | Sch30S-80S |
| DN700 | 711.0 | 6.0-16.0 | Custom |
| DN800 | 813.0 | 8.0-16.0 | Custom |
| DN900 | 914.0 | 8.0-18.0 | Custom |
| DN1000 | 1016.0 | 10.0-20.0 | Custom |
| DN1200 | 1220.0 | 12.0-25.0 | Custom |
| DN1500 | 1524.0 | 12.0-30.0 | Custom |
| DN2000 | 2032.0 | 12.0-30.0 | Custom |
Note: Dimensions above DN600 are typically custom-made. Maximum OD up to 3000mm available upon request.
Applications
Large diameter stainless steel welded pipes are widely used in the following industries:
- Oil & Gas – Pipeline transportation, offshore platform risers, flow lines, refinery piping (chloride-containing media)
- Water Treatment – Desalination plants, municipal water supply systems, wastewater treatment facilities
- Chemical & Petrochemical – Corrosive media transfer lines, pickling equipment, reactor connections
- Power Generation – Condenser tubing, cooling water systems, nuclear auxiliary systems
- Marine & Offshore – Seawater intake/outfall pipes, ballast systems, dock facilities
- Structural & Construction – Bridge piles, stadium structures, foundation piling, high-rise building supports
- Paper & Pulp – Bleaching system pipelines, chlorine dioxide lines
- Food & Beverage – Large-scale CIP systems, bulk liquid storage transfer lines
Selection Guide
| Environment | Recommended Grade | Reason |
|---|---|---|
| General industrial, fresh water, mild corrosive | 304 / 304L | Cost-effective, good corrosion resistance |
| Coastal areas, brackish water, moderate chlorides | 316 / 316L | Molybdenum provides pitting resistance |
| Seawater direct contact, chemical processing | 316L | Ultra-low carbon + Mo, best corrosion resistance |
| High-temperature service (>400℃) | 304H / 321 / 347 | Stabilized grades, better creep resistance |
| High chloride, high acidity (e.g., FGD) | 904L / 2205 Duplex | Super austenitic or duplex for extreme environments |
| Sour service (H₂S containing) | Duplex / Super duplex | Excellent SSC resistance |
Frequently Asked Questions
Q: What is the maximum diameter available for large diameter stainless steel welded pipe?
A: Our maximum outer diameter is 3000mm (120 inches). Standard large diameter pipes are typically defined as OD exceeding 406mm (16 inches).
Q: What is the difference between LSAW and SSAW large diameter pipes?
A: LSAW (Longitudinal Submerged Arc Welded) pipes have a single longitudinal weld seam, offering better dimensional accuracy and pressure rating. SSAW (Spiral Submerged Arc Welded) pipes have a spiral weld, which is more suitable for very large diameters but has slightly lower pressure ratings. For critical applications, LSAW is preferred.
Q: Can large diameter welded pipes be used for high-pressure applications?
A: Yes. With proper wall thickness selection and NDT verification (RT/UT), large diameter welded pipes are used in high-pressure oil & gas transmission lines. ASTM A312 pipes are hydrostatically tested to verify pressure integrity.
Q: How does cost compare between large diameter welded and seamless pipes?
A: Welded pipes are typically 20-30% lower in cost than seamless pipes of the same diameter and wall thickness. For large diameters (>406mm), seamless pipes become increasingly difficult and expensive to manufacture, making welded pipes the practical and economical choice.
Q: What is the typical lead time for custom large diameter pipes?
A: Stock items (common sizes up to DN600) ship within 7-15 days. Custom sizes or special grades typically require 30-60 days for manufacturing, depending on quantity and specifications.
Q: Do you provide beveled ends for field welding?
A: Yes. We offer plain ends, beveled ends (30° or 37.5°), and grooved ends as required.
Q: How can I get a quote?
A: Please provide grade, OD, wall thickness (or schedule), length, quantity, and any special requirements (beveling, coating, testing). We will respond with a competitive quote within 24 hours.
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Company
Shanxi Zhongcheng Metal Co., Ltd.
Location
Room 2, No. 221 Tianzhang Avenue, Fengdong New City, Xi'an, Shaanxi Province
Contact Person
Zhongcheng Metal