Super Duplex Stainless Steel (2507 / F53 / S32750)
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
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An ultra-high-alloyed 25% Chromium duplex stainless steel with PREN ≥ 42, engineered for deepwater offshore subsea manifolds and boiling seawater service.
Technical Explanation & Metallurgical Principles
Super Duplex 2507 (1.4410 / UNS S32750) contains 25% Cr, 7% Ni, 4% Mo, and 0.28% N. It offers extraordinarily high yield strength (≥550 MPa, nearly triple standard 316L) combined with exceptional resistance to pitting, crevice corrosion, and erosion in harsh marine and sour hydrocarbon environments.
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| PREN Rating | ≥ 42 (Critical Pitting Temp >60°C) |
| Minimum Yield Strength | 550 MPa (80 ksi) |
| Phase Balance | 40% to 60% Ferrite, balance Austenite (ASTM E562) |
Application at Jayesh Forge (Rajkot Plant)
Closed-die forged strictly up to 50 kg for offshore oil platforms, subsea Xmas tree valves, and high-pressure reverse osmosis pumps.
Related Materials, Standards & Products
Engineered Product Lines
Related Metallurgical & Testing Terms
Duplex Stainless Steel (2205 / F51 / S31803)
A dual-phase stainless steel possessing an approximate 50% austenitic and 50% ferritic microstructure, combining twice the yield strength of 316L with supreme chloride pitting resistance.
Pitting Resistance Equivalent Number (PREN)
A standardized mathematical formula that rates the localized pitting and crevice corrosion resistance of stainless steels based on their Chromium, Molybdenum, and Nitrogen content.
Sigma Phase Embrittlement (σ-Phase)
An extremely hard, brittle intermetallic Fe-Cr-Mo phase that precipitates in duplex and high-chromium stainless steels between 600°C and 900°C, destroying impact toughness.
Questions Regarding Super Duplex Stainless Steel (2507 / F53 / S32750)
Super Duplex is limited to maximum continuous service of 250°C (482°F) to avoid 475°C spinodal decomposition and alpha-prime embrittlement.
Request a Forging Quote with Super Duplex Stainless Steel (2507 / F53 / S32750) Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.