-
Industries Overview公司产品主要运用于核电、石油、石化、化工、电力、汽车、造船、化肥、医药、造纸、制糖、机械制造等工业装备行业。 -
Products & Solutions我们的产品：黑色金属矿原料（镍矿、镍铁、铬铁、锰铁、硅铁等）、无缝管、焊管、中厚板、板卷、棒材、 盘条、盘丝、管件、法兰、铸件等。 -
Community公司凭借良好的信誉、完善的服务和充足的资源，在同行业中树立了良好的口碑。 -
Production Show Room公司产品主要运用于核电、石油、石化、化工、电力、汽车、造船、化肥、医药、造纸、制糖、机械制造等工业装备行业。 -
About Us上海鑫鑫荣特钢材料有限公司于2012年通过德国莱茵检测认证服务有限公司TUV Rheinland 的ISO9001国际质量体系认证，现正和英国英国船级社子公司劳氏质量认证公司 LRQA （Lloyd's Register Quality Assurance）申请认证通过ISO9001质量体系、ISO14001国际环境管理体系和ISO45001职业健康管理体系国际认证。
-
Products & Solutions
Ultra-Pure Ferritic Stainless Steel Pipe/Tube
Ultra-Pure Ferritic Stainless Steel Pipe/Tube
Ultra-Pure Ferritic Stainless Steel Pipe/Tube
1) Overview
Ultra-pure ferritic stainless steel tubes are high-performance specialty stainless steels with extremely low carbon and nitrogen (≤100 ppm, down to 20 ppm).
They eliminate sensitization and intergranular corrosion problems of conventional ferritic grades (e.g. 430), offering excellent weldability, superior corrosion resistance, and cost efficiency compared to austenitic (316L) or duplex steels.
2) Manufacturing Process
• Melting: VOD/AOD refining for ultra-low C & N
• Forming: hot extrusion, cold rolling, cold drawing
• Heat treatment: solution annealing + rapid cooling
• Surface finish: pickling, polishing, BA
3) Key Features
• Excellent weldability: no need for post-weld heat treatment
• Superior intergranular corrosion resistance: no Cr depletion
• Chloride pitting resistance: high Cr (18–30%) + Mo (2–4%)
• Good high-temperature oxidation resistance
• Cost-effective alternative: better than 316L, cheaper than duplex/super austenitic
4) Standards
• ASTM A268 / ASME SA268: seamless ferritic stainless tubes
• ASTM A249 / A268: welded ferritic stainless tubes
• EN 10217-7: welded stainless tubes for fluids
• GB/T 14976: stainless seamless tubes for fluids
• JIS G 4305 / G 3463: ferritic stainless steel tubes
5) Typical Grades
Grade: 444 — Corresponding UNS No. S44400
• Cr%: 17.5–19.5
• Mo%: 1.75–2.5
• Features: Superior pitting resistance compared with 316L. Commonly used in heat exchangers and water heaters.
Grade: 4462 — Corresponding UNS No. S44625
• Cr%: 25–27
• Mo%: 3–4
• Features: High chromium and high molybdenum content, with corrosion resistance close to duplex stainless steels.
Grade: 29Cr-4Mo-2Ni — Corresponding UNS No. S44700
• Cr%: 28–30
• Mo%: 3.5–4.2
• Features: Extremely high corrosion resistance, suitable for seawater desalination and chemical processing equipment.
6) Applications
• Power & industrial cooling: condensers, heat exchangers in chloride-rich environments
• Appliances: water heaters, solar collectors, dishwashers
• Automotive: exhaust systems, high-temp resistant tubing
• Chemical & petrochemical: corrosive pipelines in acidic/chloride media
• Desalination: seawater-resistant piping & heat exchanger tubes
7) Quality & Testing
• Chemical analysis (C+N ≤100 ppm)
• Mechanical tests: tensile, hardness, impact
• Corrosion tests: pitting potential, ASTM A262 IGC tests
• Weld tests: joint toughness & corrosion resistance
• NDT: eddy current, ultrasonic, radiographic
• Third-party inspection: SGS, BV, LR, DNV
8) Supply & Packaging
• Forms: seamless, welded, heat exchanger, U-bent tubes
• Size range: OD 6 – 530 mm, WT 0.8 – 12 mm
• Surface: pickled, polished, BA
• Ends: plain, beveled, threaded
• Packaging: plastic end caps + anti-rust oil + wooden crates/bundles
• Traceability: MTC (EN 10204 3.1/3.2)
9) Our Advantages
• Ultra-low C+N control ensures superior weldability & corrosion resistance
• Complete grade range (444, 4462, 29Cr-4Mo-2Ni)
• Balanced cost-performance: ideal replacement for 316L & duplex steels
• Certified compliance: ASTM, EN, GB/T, JIS standards
• Wide industry coverage: power, chemical, household appliances, automotive, desalination
Tags:
