Super Duplex 2507 S32750 Seamless Pipe ASTM A790 High Strength for Oil Gas Marine

1. Product Description

Duplex stainless steel pipe is a high-alloy tubular product engineered with a dual-phase microstructure that is metallurgically optimized for maximum resistance to localized corrosion and mechanical degradation under extreme service conditions. The chemical composition is precisely balanced to achieve a desired pitting resistance equivalent number (PREN) while maintaining a ferrite/austenite phase ratio of 35:65 to 65:35. Pipes are manufactured in accordance with multiple international standards, offering full interchangeability across global projects. Products are available in both cold-finished seamless and hot-finished welded configurations, with the option of enhanced nondestructive examination (NDE) for critical-service applications.

2. Product Applications

Beyond traditional oil and gas, duplex pipes are now critical enablers in emerging energy transition and specialized industrial sectors:

• Hydrogen transport and storage – suitable for gaseous hydrogen transmission pipelines (with appropriate fatigue assessment) due to low hydrogen embrittlement susceptibility relative to high-strength carbon steels.

• Carbon Capture, Utilization & Storage (CCUS) – for supercritical CO₂ injection lines, requiring resistance to wet CO₂ corrosion with trace impurities (SOx, NOx, O₂).

• Deep-sea mining riser systems – handling abrasive polymetallic nodule slurries at extreme hydrostatic pressures.

• Exhaust gas scrubber systems (EGCS) – in marine vessels, handling acidic washwater with pH as low as 2.0.

• Cryogenic liquid gas transfer – for LNG and ethane loading arms, leveraging good toughness down to -40°C.

• Geothermal wellhead flowlines – resisting high-temperature brine with high total dissolved solids (TDS) and H₂S/CO₂.

​3. Product Advantages

• Lower lifecycle cost (LCC) – although initial material cost is 1.5–2.5× that of carbon steel, the extended service life and near-zero maintenance in corrosive environments typically deliver 30–50% LCC reduction over a 20-year design life compared to carbon steel with corrosion allowance.

• Reduced pipe wall thickness and weight – design stress allowables permit wall thickness reductions of 40–50% versus carbon steel (same pressure), translating to lower support costs, smaller welding volumes, and reduced transportation expenses.

• Superior hydraulic performance – smoother internal surface and higher allowable velocities (up to 30 m/s in seawater, 60 m/s in dry gas) reduce pipe diameter requirements and pumping power consumption.

• Resistance to microbiologically influenced corrosion (MIC) – the high chromium and molybdenum content inhibits biofilm adhesion and sulfide-induced pitting, critical for stagnant or low-flow seawater lines.

• Predictable long-term performance – well-established PREN-based empirical models allow accurate remaining-life predictions for asset integrity management.

• Low magnetic permeability – in the range of 1.01–1.10 (after proper annealing), beneficial for applications sensitive to electromagnetic interference.

​

4.​Key Specifications

FAQ

1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.

2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.

4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.