Case Overview
A shipyard and offshore fabrication supplier was replacing mild-steel seawater pipes after premature pitting failures in ballast and main-engine cooling lines on a vessel project. The customer needed CuNi seawater tubes with verified chemistry and documented pressure-test readiness, delivered to an inflexible construction schedule.
DZX qualified with CuNi10Fe and CuNi30Mn tubes with verified chemistry, dimensional reports and pressure-test documentation, delivered to the shipyard’s block-construction schedule with zero material delays.
This case summarizes the application requirements, materials supplied by DZX and delivery value. For case-specific technical data, please contact our engineering team.
| Item | Details |
|---|---|
| Client Profile | Shipyard and offshore fabrication supplier |
| Project Scale | Vessel seawater piping systems, block construction |
| Application | Ballast, main-engine cooling, fire-main and sanitary seawater piping |
| Materials Supplied | CuNi10Fe and CuNi30Mn tubes and fittings |
| Supply Forms | Tube, fittings and plate |
| Lead Time | Standard sizes: 2-3 weeks; mill batches: 5-6 weeks |
| Project Country | South Korea |
| Project Year | 2024 |
Our Solution
The project required three supply assurances:
- Seawater service life: ballast and cooling lines needed CuNi grades with verified chemistry for erosion-corrosion resistance at typical service flow velocities.
- Fabrication readiness: tubes had to be straight, round and uniform enough for bending and welding without rework, with dimensions verified for every coil.
- Schedule discipline: block-construction windows were fixed; deliveries needed confirmed dates aligned with the shipyard schedule.
DZX matched supply to the shipyard’s fabrication process:
CuNi10Fe tubes were supplied at 25 mm × 2.5 mm, with chemistry verified to ASTM B151 and dimensional reports for bending and welding. CuNi30Mn covered high-flow and impingement-prone sections, while plate served headers and flanges. Every batch included chemistry, dimensional and pressure-test documentation, with deliveries scheduled to block-construction windows.
| Material | Representative Grades | Key Properties | Available Forms |
|---|---|---|---|
| CuNi alloys | CuNi10Fe | Seawater piping, general service | Tube and plate |
| CuNi alloys | CuNi30Mn | High-flow, impingement-resistant service | Tube and plate |
| Copper alloys | To drawing | Fittings and flanges | Plate and bar |
Seawater piping
High-flow seawater service
Matching piping components
Technical Specifications
Key technical parameters agreed before production. Contact us for grade-specific datasheets and tolerance-verification reports.
| Parameter | Agreed Specification | Verification Method |
|---|---|---|
| Tube dimensions (typical) | 25 mm OD × 2.5 mm wall | Micrometer + thickness measurement |
| Chemical composition | CuNi10Fe / CuNi30Mn to ASTM B151 | Batch chemical analysis |
| Straightness | To fabrication requirements | Coil-by-coil straightness inspection |
| Pressure-test readiness | To classification-society rules/specification | Hydrostatic test records within the agreed scope |
| Delivery schedule | Aligned with block-construction windows | Dates confirmed per order |
Each supplied batch includes a quality inspection certificate with chemical analysis, meeting the applicable standard for each grade.
| Material | Applicable Standards |
|---|---|
| CuNi alloys | ASTM B151、B171 |
| Copper alloys | ASTM B152、B187 |
| Quality System | Quality certificate including chemical analysis and mechanical properties |
Delivery and Quality Support
- Fast delivery: Sample and production lead times follow the project schedule; standard grades and sizes can be dispatched promptly from stock.
- Quality traceability: Every batch includes material certificates and inspection reports, with full heat and batch traceability.
- Technical support: Responsive support covers pre-sale material selection, drawing review and post-sale processing advice.
- Ongoing service: Regular follow-up after delivery tracks performance and addresses feedback promptly.
Customer Feedback
- Seawater service life restored: verified CuNi chemistry replaced pitting-prone carbon steel in ballast and cooling lines
- Zero fabrication rework: straight, uniform tubes bent and welded without material-related rework
- Schedule achieved: deliveries matched shipyard block-construction windows
- Pressure-test readiness: documented hydrostatic-test readiness within the agreed scope
- Auditable batches: chemistry, dimensional and test reports for every coil
- One-stop piping package: tubes, plate and fittings coordinated by one manufacturer
Our Capabilities
Jiangsu DZX Technology Co., Ltd. (Changzhou DLX Alloy) was founded in 2016. Its core team has worked in the field since 2002, with 24 years of precision-alloy R&D and production experience, operating a self-owned 12,000-square-meter modern factory with an ISO9001 system covering three inspection stages. Annual alloy output exceeds 1,200 tonnes, serving 1500+ business customers worldwide. The company operates integrated melting, drawing, annealing and precision-machining workshops, supporting volume customization of strip, wire, tube and bar. Every batch includes a chemical analysis report (MTC) for full delivery-quality traceability.
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