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Special stainless steel pipes are engineered for extreme operating conditions where standard 304 or 316 grade alloys reach their mechanical and corrosion limits. Featuring elevated concentrations of chromium, nickel, molybdenum, and nitrogen, our special stainless steel tubing range includes Super Austenitic (e.g., 254SMO, 904L, AL-6XN) and Duplex / Super Duplex grades (e.g., 2205, 2507). These advanced alloys deliver supreme immunity to chloride pitting, crevice corrosion, stress corrosion cracking (SCC), and severe acidic exposure.
| Grade / Alloy | UNS / W.Nr. | Structure Type | PREN Value | Primary Environment / Application |
|---|---|---|---|---|
| 254SMO | UNS S31254 / 1.4547 | Super Austenitic | ≥ 42 | Seawater handling, flue gas desulfurization, bleaching plants |
| 904L | UNS N08904 / 1.4539 | Super Austenitic | ≥ 34 | Sulfuric acid processing, chemical tanks, phosphate fertilizers |
| 2205 Duplex | UNS S32205 / 1.4462 | Duplex (50/50) | 32 – 35 | Oil & gas piping, chemical tankers, heat exchangers |
| 2507 Super Duplex | UNS S32750 / 1.4410 | Super Duplex | ≥ 42 | Subsea pipelines, reverse osmosis desalination, marine equipment |
