S25073 Super Duplex Stainless Steel Product Introduction

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S25073 (UNS S25073 / F55 / EN 1.4507) is a hyper-duplex stainless steel engineered for extreme environments. It features a balanced ferritic-austenitic microstructure with enhanced alloying, positioning it between standard duplex (e.g., S31803) and nickel alloys in performance hierarchy.

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Controlled chemistry includes 24-26% chromium, 6-8% nickel, 3.0-4.0% molybdenum, 0.20-0.30% nitrogen, and 0.5-1.0% copper. Low carbon content (<0.030%) and tightly managed impurities optimize corrosion resistance.

I'm sorry, but it seems that there is no text provided for translation. Please provide the text you would like me to translate.3. Key Performance AttributesI'm sorry, but it seems that there is no text provided for translation. Please provide the text you would like me to translate.

• I'm sorry, but it seems there is no text provided for translation. Please provide the text you would like me to translate.Corrosion ResistanceIt seems that there is no text provided for translation. Please provide the text you would like to have translated.
  • PREN ≥45 (superior to S32760)
  • Exceptional resistance to chloride pitting/crevice corrosion, acid attack, and stress corrosion cracking (SCC)
• It seems that there is no text provided for translation. Please provide the text you would like me to translate.Mechanical StrengthIt seems that there is no text provided for translation. Please provide the text you would like me to translate.
  • Minimum yield strength: 550 MPa (≈2× 316L stainless steel)
  • Impact toughness maintained down to -40°C
• It seems that there is no text provided for translation. Please provide the text you would like me to translate.Thermal StabilityIt seems that there is no text provided for translation. Please provide the text you would like me to translate.
  • Continuous service: -50°C to 300°C
  • Avoid 550-900°C range to prevent σ-phase embrittlement

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• It seems that there is no text provided for translation. Please provide the text you would like me to translate.Oil & Gas: Subsea manifolds, X-mas trees, sour service pipelines (NACE MR0175 compliant)
• I'm sorry, but it seems there is no text provided for translation. Please provide the text you would like me to translate.Chemical Processing: Agitators in HCl environments, sulfuric acid coolers
• It seems that there is no text provided for translation. Please provide the text you would like me to translate.Marine Technology: Offshore risers, seawater injection systems
• I'm sorry, but it seems that there is no text provided for translation. Please provide the text you would like me to translate.Energy: Flue gas scrubber components, geothermal brine piping

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• I'm sorry, but it seems that there is no text provided for translation. Please provide the text you would like me to translate.Weldability: Compatible with TIG/SAW using ER2594 filler metal. Requires controlled heat input (0.5-1.5 kJ/mm) and interpass temp <100°C.
• I'm sorry, but it seems there is no text provided for translation. Please provide the text you would like me to translate.Machinability: 35% lower cutting speeds than 304 stainless recommended; use positive-geometry carbide tools.
• I'm sorry, but it seems there is no text provided for translation. Please provide the text you would like me to translate.Formability: Cold-working possible but annealed state (1040-1100°C WQ) preferred for severe forming.

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• Replaces high-nickel alloys (e.g., Alloy 625) in aggressive media, reducing material costs by 30-40%
• Outperforms standard super duplex grades in sulfide stress cracking (SSC) resistance
• Certified to ASTM A182 F53 / ASME SA-182 for pressure equipment