Super Duplex 2507 Ball Valve
High-strength Super Duplex (UNS S32750 / F53) ball valves for chloride-rich seawater, desalination, and subsea / offshore service where 316 stainless fails.
Supreme Valves supplies Super Duplex 2507 ball valves for the most aggressive chloride and seawater environments. With ~25% chromium and a Pitting Resistance Equivalent Number (PREN) above 40, Super Duplex (UNS S32750 / ASTM A182 F53 / A890 5A) offers roughly twice the yield strength of austenitic 316 plus outstanding resistance to pitting, crevice corrosion, and chloride stress-corrosion cracking — ideal for seawater cooling, desalination, FPSO, and subsea applications.
Technical Specifications
Why Super Duplex for Seawater & Subsea
- PREN > 40 — resists pitting and crevice corrosion in high-chloride seawater and brine
- Excellent resistance to chloride stress-corrosion cracking (SCC) versus 304/316
- High strength allows thinner walls and lighter valves for offshore weight savings
- NORSOK and NACE compliant for North Sea, Gulf, and subsea oil & gas
- Ideal for seawater lift, firewater, ballast, desalination, and produced-water systems
Frequently Asked Questions
What is Super Duplex 2507?
Super Duplex 2507 (UNS S32750) is a high-alloy stainless steel with a balanced austenitic-ferritic microstructure, ~25% chromium, 7% nickel, 4% molybdenum, and nitrogen. Its PREN exceeds 40, giving exceptional resistance to chloride pitting, crevice corrosion, and stress-corrosion cracking.
When should I choose Super Duplex over 316 stainless?
Choose Super Duplex for seawater, brine, desalination, and high-chloride or sour service where 316 stainless suffers pitting and stress-corrosion cracking. It also offers about double the yield strength, enabling lighter, higher-pressure designs.
Are these valves NACE and NORSOK compliant?
Yes. Super Duplex 2507 ball valves can be supplied to NACE MR0175 / ISO 15156 for sour service and NORSOK M-650/M-630 for offshore qualification, with API 607 fire-safe certification on request.
What sizes and classes are available?
Super Duplex ball valves are available from 1/2" to 36" (DN15–DN900) in Class 150 through Class 2500, floating or trunnion-mounted, with flanged or butt-weld ends.
Need Super Duplex Valves for Seawater or Subsea Service?
Request a technical datasheet, material certification details, or a project quotation from our engineering team. We export to Saudi Arabia, the UAE, and across the Gulf.