Ultimate Defense Against Pitting & Stress Corrosion: Super Duplex Pipes by TOBO (ASTM A928 / DIN 1.4507)

Ultimate Defense Against Pitting & Stress Corrosion: Super Duplex Pipes by TOBO (ASTM A928 / DIN 1.4507)

TOBO's Super Duplex Stainless Steel Pipes are engineered to provide an unbeatable barrier in the most corrosive industrial landscapes. Marrying exceptional yield strength with superior resistance to localized and stress corrosion, these pipes are the definitive choice for engineers prioritizing asset longevity and system safety. They are designed to withstand prolonged exposure to chlorides, acids, and harsh offshore conditions, delivering reliable performance that minimizes downtime and maximizes operational efficiency for critical fluid transport systems.

1. Product Description
   This product line consists of premium Super Duplex Stainless Steel pipes, characterized by a ferritic-austenitic microstructure with a balanced phase ratio. The controlled manufacturing process, which includes solution annealing and rapid quenching, ensures optimal microstructure development. This results in a material that consistently provides enhanced mechanical properties and corrosion resistance, making it suitable for fabrication into complex piping systems for aggressive service.

2. Key Parameters
   The pipes conform to ASTM A928 (for weld-fabricated pipes) and incorporate material grades meeting the German standard DIN EN 10216-5 for 1.4507 (UNS S32750). Key material properties include a PREN (Pitting Resistance Equivalent Number) typically >40, a minimum yield strength of 550 MPa, and excellent elongation and impact values. They are available in a full range of nominal pipe sizes (NPS) and wall schedules (SCH) to accommodate diverse pressure ratings.

3. Product Applications
   These pipes are specified for critical applications where standard stainless steels are inadequate. They are extensively used in seawater cooling systems, offshore brine handling, chemical processing with halides, sour gas environments in oil & gas production, and salt concentrate lines in desalination plants. Their robustness also makes them suitable for structural components in marine and coastal environments.

4. Product Advantages
   The standout advantage is their exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), far surpassing standard 316L or 317L austenitic grades. This is combined with very high mechanical strength, allowing for pressure capability in thinner, lighter sections. The material also offers good fatigue strength and thermal conductivity, contributing to durable and efficient system design.

5. Product Functionality
   The primary function of these pipes is to serve as a highly durable and impenetrable conduit, ensuring the safe and continuous flow of aggressive media. They are built to maintain system integrity under high internal or external pressure, thermal cycling, and mechanical stress. This functionality directly translates to extended service life, reduced maintenance intervals, and enhanced safety margins, protecting both capital investment and the surrounding environment.

Payment & Invoicing

• First-Time Clients: 50% advance payment, 50% balance before shipment.
• Strategic Clients: 30% advance, 70% payment against copy of Bill of Lading.
• Long-Term Agreements: 60-day credit terms available (subject to credit approval).
• Invoicing: 13% VAT Special Invoice provided; FORM A Certificate of Origin for exports.
• fication System: Laser marking includes material code, pressure rating, and flow direction arrows.

FAQ

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