Shanxi Zhongcheng Metal Co., Ltd.
| Standard | ASTM A312, ASME SA312, ASTM A358 |
| Length | 6 Meters, 12 Meters, or custom |
| Tensile Strength | ≥ 490 MPa |
| Surface Finish | Pickled & Passivated, 2B, No.1 |
| Inspection | 100% RT on weld seam, DPT, PMI, Hydrostatic Test, Intergranular Corrosion Test ASTM A262 Practice E |
| Delivery Time | 15-20 days for standard sizes, 25-35 days for large diameter custom orders |
| Welding Method | TIG Plasma + SAW, 100% X-ray tested |
| PREN Value | ≥ 34 (Pitting Resistance Equivalent Number) |
| Application | SWRO desalination, seawater intake/outfall, brine concentrators, MSF evaporators |
| Supply Ability | 300 Tons per Month |
| Payment Terms | T/T,L/C at sight,D/P |
| Outer Diameter (OD) | 114.3mm - 610mm (4" - 24" NB) |
| Wall Thickness (WT) | 3.0mm - 20.0mm (SCH 10S / 40S / 80S) |
| Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Yield Strength (0.2%) | ≥ 220 MPa |
| Packaging Details | End bevel protectors, nylon sling bundling, vapor phase corrosion inhibitor (VCI) film, seaworthy wooden case with steel corner reinforcement |
| Model Number | 904L-WELD-A312 |
| Place of Origin | Zhejiang, China |
| Brand Name | WNRLN |
| Certification | ISO 9001:2015, ISO 14001, ABS Type Approval, DNV GL |
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Product Specification
| Standard | ASTM A312, ASME SA312, ASTM A358 | Length | 6 Meters, 12 Meters, or custom |
| Tensile Strength | ≥ 490 MPa | Surface Finish | Pickled & Passivated, 2B, No.1 |
| Inspection | 100% RT on weld seam, DPT, PMI, Hydrostatic Test, Intergranular Corrosion Test ASTM A262 Practice E | Delivery Time | 15-20 days for standard sizes, 25-35 days for large diameter custom orders |
| Welding Method | TIG Plasma + SAW, 100% X-ray tested | PREN Value | ≥ 34 (Pitting Resistance Equivalent Number) |
| Application | SWRO desalination, seawater intake/outfall, brine concentrators, MSF evaporators | Supply Ability | 300 Tons per Month |
| Payment Terms | T/T,L/C at sight,D/P | Outer Diameter (OD) | 114.3mm - 610mm (4" - 24" NB) |
| Wall Thickness (WT) | 3.0mm - 20.0mm (SCH 10S / 40S / 80S) | Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Yield Strength (0.2%) | ≥ 220 MPa | Packaging Details | End bevel protectors, nylon sling bundling, vapor phase corrosion inhibitor (VCI) film, seaworthy wooden case with steel corner reinforcement |
| Model Number | 904L-WELD-A312 | Place of Origin | Zhejiang, China |
| Brand Name | WNRLN | Certification | ISO 9001:2015, ISO 14001, ABS Type Approval, DNV GL |
| High Light | ASTM A312 904L stainless steel pipe ，EN 1.4539 seawater desalination pipe ，chloride resistant stainless steel pipe | ||
Seawater desalination demands materials that can withstand some of the most aggressive chloride-rich environments on earth. ASTM A312 904L welded pipe in EN 1.4539 grade is purpose-engineered for long-term reliability in SWRO plants, multi-stage flash (MSF) evaporators, and brine concentration systems. Its high molybdenum and copper alloying provides a Pitting Resistance Equivalent Number (PREN) exceeding 34, placing it well above standard 316L and 317L grades for marine service.
Desalination piping systems are continuously exposed to high-chloride seawater at elevated temperatures and flow velocities. Under these conditions, conventional stainless steels suffer from pitting corrosion, crevice corrosion beneath gaskets and deposits, and microbiologically influenced corrosion (MIC). The 904L grade addresses all three failure modes through its balanced alloy composition: high chromium forms a robust passive film, molybdenum prevents chloride penetration into pits, nickel ensures uniform austenitic structure, and copper provides an additional barrier against reducing conditions that develop within crevices and beneath biofilms.
Our 904L welded pipes are fabricated from prime cold-rolled or hot-rolled plate stock using a multi-pass welding sequence: TIG plasma root pass for full penetration with controlled heat input, followed by submerged arc welding (SAW) for the fill and cap passes. Every weld seam undergoes 100% radiographic testing (RT) per ASME Section V, dye penetrant testing (DPT) per ASTM E165, and post-weld solution annealing at 1070-1150°C with rapid quenching to restore full corrosion resistance across the heat-affected zone (HAZ).
| Test Method | Condition | Performance |
|---|---|---|
| ASTM G48 Method A (Ferric Chloride Pitting Test) | 6% FeCl₃, 22°C, 72h | No pitting observed, weight loss < 0.001 g |
| ASTM A262 Practice C (Huey Test) | 65% HNO₃, boiling, 5*48h periods | Corrosion rate < 0.15 mm/year |
| ASTM G36 (Boiling MgCl₂ SCC Test) | 45% MgCl₂, 155°C, 24h | No cracking after 500h exposure |
| Critical Pitting Temperature (CPT) | Per ASTM G150 | CPT ≥ 55°C in 1M NaCl |
904L welded pipes in this specification have been successfully deployed in major desalination projects across the Middle East, North Africa, and Southeast Asia, including SWRO plants with capacities exceeding 250,000 m³/day. The alloy's proven track record in brine heater tubing, seawater intake risers, and high-pressure RO feed lines demonstrates unmatched reliability for mission-critical desalination infrastructure.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
2010
Total Annual:
20000000-50000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
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