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Products & Solutions
Super Austenitic Stainless Steel Pipe
Super Austenitic Stainless Steel Pipe
Super Austenitic Stainless Steel Pipe
1) Overview
Super Austenitic Stainless Steel Pipes are high-performance stainless steels developed for extremely corrosive environments where conventional 304L or 316L steels fail.
Defined by a Pitting Resistance Equivalent Number (PREN) > 40, these alloys achieve superior pitting/crevice corrosion resistance, SCC resistance, and high strength through elevated Ni, Mo, and N contents.
2) Manufacturing Process
• Melting: EAF + AOD/VOD refining
• Forming: hot extrusion, cold rolling, cold drawing
• Types: seamless & welded pipes (ERW, SAW, TIG)
• Heat treatment: solution annealing + rapid cooling
• Surface finish: pickling, mechanical polishing, BA annealing
3) Key Features
• Chloride corrosion resistance: excellent in seawater, brines, chlorides
• Stress corrosion cracking resistance: superior to standard 300-series
• High strength & toughness: nitrogen addition enhances yield strength and low-temperature toughness
• Acid resistance: 904L performs well in sulfuric & phosphoric acids
• Good weldability & formability
4) Standards
• ASTM A312 / ASME SA312: seamless & welded austenitic stainless pipes
• ASTM A269 / ASME SA269: general purpose stainless pipes
• ASTM B673 / B675: welded pipes for high-nickel/super austenitic grades
• GB/T 14976: stainless seamless pipes for fluid service
5) Typical Grades
Grade 254SMO (6Mo) — Corresponding UNS S31254
• Mo: ~6%
• Features: High PREN value, widely used in seawater and chemical industries.
Grade AL-6XN — Corresponding UNS N08367
• Ni: ~24.5%, Mo: ~6.5%
• Features: Excellent resistance to chloride-induced corrosion.
Grade 904L — Corresponding UNS N08904
• Ni: ~25%, with Cu addition
• Features: Superior resistance to strong reducing acids such as sulfuric acid and phosphoric acid.
Grade 654SMO — Corresponding UNS S32654
• Mo: ~7.5%
• Features: Extremely high PREN value, suitable for the most severe corrosive environments.
6) Applications
• Marine & offshore: desalination, subsea pipelines, fire-fighting systems, heat exchangers
• Chemical & petrochemical: FGD systems, chlor-alkali, fertilizer plants
• Pulp & paper: bleaching plants, corrosive liquor handling
• Cryogenic service (LNG): tanks & pipelines
• High-end industries: pharma, food, electronics process lines
7) Quality & Testing
• Chemical composition: spectrometry for Ni/Mo/N accuracy
• Mechanical tests: tensile, impact, hardness
• Corrosion testing: pitting potential, chloride solution testing
• NDT: UT, ET, RT
• Dimensional & surface checks: OD, WT, ovality, surface defects
• Third-party certification: TÜV, SGS, BV, LR, DNV
8) Supply & Packaging
• Forms: seamless, welded, heat exchanger, U-bent tubes
• Size range: OD 6 – 610 mm, WT 0.8 – 40 mm
• Surface finish: pickled, polished, BA, EP
• Ends: plain, beveled, threaded
• Packaging: plastic caps + anti-rust oil + wooden cases/steel racks
• Traceability: MTC (EN 10204 3.1/3.2)
9) Our Advantages
• Complete grade coverage: 254SMO, 904L, AL-6XN, 654SMO
• Strict QC: API, ASTM, ASME, GB/T, DNV compliance
• Customization: non-standard sizes & tailored solutions
• Certifications: ABS, BV, LR, DNV available
• Wide applications: marine, chemical, energy, LNG, pharma, food
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