UNS S32615 Seamless Steel Pipe
Available Size Range：O.D.: 6mm - 325mm or custom
W.T.: 1mm - 30mm
Length: Cut-to-length (up to 12 meters)
Product Forms Seamless Pipe, Fittings
UNS S32615 seamless steel pipe is a high-silicon austenitic stainless steel representing the pinnacle of corrosion-resistant alloy technology. Through precise balancing of key elements such as chromium, nickel, molybdenum, copper, and nitrogen, it achieves optimal performance in highly aggressive, high-chloride, and elevated temperature/pressure conditions.
Our S32615 seamless pipes are manufactured using advanced hot extrusion or cold drawing processes, ensuring a smooth internal surface, precise dimensions, and uniform wall thickness. They are the core material choice for building long-service-life, highly reliable, and low-maintenance industrial fluid handling systems. The stable single-phase austenitic structure guarantees non-magnetic properties, high toughness, and excellent fatigue resistance.
Technical Data & Specifications
| Item | Details |
|---|---|
| Common Standards | UNS S32615, DIN/EN 1.4539, F63 |
| Key Composition | C≤0.015%, Si: 5.0-6.0%, Mn≤1.0%, Cr: 24.0-25.0%, Ni: 20.5-22.5%, Mo: 6.0-7.0%, Cu: 0.5-1.5%, N: 0.18-0.25% |
| Density | 7.8 g/cm³ |
| Mechanical Properties (Typical) | Tensile Strength ≥750 MPa, Yield Strength ≥400 MPa, Elongation ≥35% |
| Heat Treatment Condition | Solution Annealed @ 1050-1150°C, Water Quenched |
| Available Size Range | O.D.: 6mm - 325mm or custom W.T.: 1mm - 30mm Length: Cut-to-length (up to 12 meters) |
| Product Forms | Seamless Pipe, Fittings (compatible elbows, tees, flanges available) |
Performance Advantages
1. Unmatched Corrosion Resistance
UNS S32615 seamless steel pipe is the optimal choice for combating strong acid corrosion in chemical processing and chloride-induced corrosion in marine environments. Its high Cr, Mo, and N content forms an extremely stable passive layer, effectively resisting reducing acids and localized corrosion even at elevated temperatures. It serves as a cost-effective alternative to alloys like Hastelloy or titanium in specific applications.
2. High-Temperature Strength & Oxidation Resistance
Maintains good mechanical strength and oxidation resistance at continuous service temperatures up to 400°C, suitable for thermal applications such as heat exchanger tubes and furnace tubes.
3. Superior Weldability & Fabrication
Welding Process: Gas Tungsten Arc Welding (GTAW/TIG) is recommended using matching high-nickel alloy filler wire.
Critical Recommendation: Preheating to 150–200°C is advised before welding. A post-weld solution heat treatment at 750–800°C followed by rapid cooling is essential to minimize sensitization in the heat-affected zone and restore optimal corrosion resistance.
Cold Workability: Exhibits good cold forming properties for operations like bending and flaring.
Primary Application Areas
Our UNS S32615 seamless pipes are widely used in the following industries with demanding material requirements:
Chemical & Petrochemical: Sulfuric Acid Recovery (SAR) units, piping for concentrated sulfuric acid handling, mixed acid reactors, high-pressure autoclaves, distillation columns, heat exchangers.
Marine & Desalination: High-pressure piping in Multi-Stage Flash (MSF) or Reverse Osmosis (RO) desalination plants, seawater cooling systems, and critical piping on offshore platforms.
Oil & Gas Extraction: Downhole tools, flowlines, valves, and pressure vessel components for sour service with high chloride and H₂S content.
Environmental & FGD: Flue gas scrubber systems, spray pipes, and mist eliminators in wet Flue Gas Desulfurization (FGD) units.
Pharmaceutical & Specialty Chemicals: Process piping systems requiring ultra-high purity and corrosion resistance.
Frequently Asked Questions
Q1: What are the advantages of S32615 compared to 904L and 254 SMO (F44/6Mo)?
A1: S32615 (F63) has a significantly higher silicon content (~5.5%) than the latter grades, giving it a decisive advantage in hot concentrated sulfuric and phosphoric acid environments. Its balanced Cr, Mo, and N levels also ensure chloride pitting resistance comparable to 6Mo steels.
Q2: What is the standard delivery condition for UNS S32615 seamless steel pipe?
A2: Our standard delivery condition is Solution Annealed. This ensures the material is in an optimal state for corrosion resistance and mechanical properties, and is ready for subsequent fabrication.
Q3: Can you supply compatible fittings and flanges?
A3: Yes. We can provide matching butt-weld fittings such as elbows, tees, and flanges in the same grade, guaranteeing material consistency and weld compatibility throughout the piping system.
Q4: How should the S32615 pipe be machined and welded?
A4: Machining with carbide tools is recommended. For welding, always use an inert gas shielding process and strictly adhere to the recommended thermal cycle (preheat and post-weld solution heat treatment), which is critical for achieving corrosion-resistant welds.
Request Your Custom UNS S32615 seamless steel pipe Quote
Mob: +86-13772502581
Email: judesteel@juqing.hk
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