The SEA-DEEPLOY® D610-N625 is a high-integrity, metallurgically bonded bimetallic clad pipe designed for ultra-deepwater (≥1,500 m) subsea pipeline systems exposed to severe sour service environments (high H₂S, CO₂, and chlorides).
SEA-DEEPLOY® D610-N625
Nickel-Based Metallurgically Bonded Clad Pipe for Ultra-Deepwater Oil & Gas Service
Recommended by Nexus Engineering Products (NEP) — Global EPC Integration & Advisory Platform
The SEA-DEEPLOY® D610-N625 is a high-integrity, metallurgically bonded bimetallic clad pipe designed for ultra-deepwater (≥1,500 m) subsea pipeline systems exposed to severe sour service environments (high H₂S, CO₂, and chlorides).
This product integrates a 2.0 mm UNS N06625 (Inconel 625) corrosion-resistant alloy (CRA) inner layer with a 16.9 mm X65MS sour-service carbon steel structural outer layer, offering optimal lifecycle cost performance through material synergy.
|
Parameter |
Value |
|
Nominal Size |
DN600 (OD 610 mm) |
|
Wall Configuration |
Clad Layer: 2.0 mm UNS N06625 |
|
Total Wall Thickness |
18.9 mm |
|
Bonding Method |
Full metallurgical bond via hot-rolling + JCO forming + specialized welding |
|
Bond Shear Strength |
≥210 MPa (per GB/T 13149 / ISO 21028) |
|
Hydrotest Pressure |
≥25 MPa (1.5× design pressure) |
|
NDT Coverage |
100% UT (bond integrity) + 100% ET (surface) + PMI verification |
|
Certification |
China Classification Society (CCS) – Certificate for Offshore Facilities (Issued June 2025) |
|
Compliance |
API 5LC, ISO 15156/NACE MR0175, DNV-ST-F101 (design basis) |
|
Item |
Detail |
|
Manufacturer |
A leading Chinese OCTG & linepipe producer (CCS-certified, national key enterprise) |
|
Production Base |
Qinhuangdao, Hebei Province, China |
|
Annual Capacity |
≥5,000 metric tons (expandable) |
|
Lead Time |
90 days after PO (vs. 6–12 months for Western suppliers) |
|
Pricing Range |
USD 7,000 – 10,000 per metric ton (FOB China, volume-dependent) |
|
Customization |
Available for OD 406–762 mm; clad thickness 1.5–3.0 mm |
NEP provides end-to-end support: technical validation, EPC partner matching, financing advisory, and logistics coordination.
Project: Deepwater Gas Development, South China Sea
Client: CNOOC
Scope: Pilot deployment of 500+ tons of D610-N625 clad pipe for 1,600m water depth flowline
NEP Role:
| Feature | D610-N625 (China) | Vallourec / Tenaris |
|---|---|---|
| Clad Alloy | UNS N06625 (NS3306) | Inconel® 625 |
| Backing Steel | X65MS / L450 (sour service) | X65 Q/T sour resistant |
| Bond Quality | Metallurgical, no delamination risk | Metallurgical (roll-bonded) |
| Certification Basis | CCS + API/ISO standards | DNV, ABS, LR, API |
| Lead Time | 90 days FOB China | 6–12 months |
Independent lab tests confirm equivalent corrosion resistance in simulated South China Sea conditions.
Proven Domestic Alternative – Chinese-made N06625/X65MS clad pipe certified for offshore use
Risk-Mitigated Sourcing – Pre-vetted by NEP’s engineering & compliance team
Integrated Delivery – NEP connects you to EPC, coating, installation, and financing partners
