UNS S32615 fittings offer the opportunity to have a secure and corrosion-resistant connection to piping in the presence of concentrated acids and aggressive media of the chemical type. These fittings are manufactured using high-alloy austenitic stainless steel with increased silicon and copper content hence their integrity is maintained in service under extreme conditions. They come in tees, reducers, caps, elbows, etc and are strictly made to the specifications of ASME and ASTM standards. UNS S32615 fittings are popular in chemical plants, acid plants and corrosive process environments that need long duration performance.
UNS S32615 Pipe Chemical Composition
| Element | Symbol | Min (%) | Max (%) |
|---|---|---|---|
| Carbon | C | — | 0.070 |
| Silicon | Si | 4.800 | 6.000 |
| Manganese | Mn | — | 2.000 |
| Phosphorus | P | — | 0.045 |
| Sulfur | S | — | 0.030 |
| Chromium | Cr | 16.500 | 19.500 |
| Nickel | Ni | 19.000 | 22.000 |
| Copper | Cu | 1.500 | 2.500 |
| Molybdenum | Mo | 0.300 | 1.500 |
| Iron | Fe | Balance | — |
UNS S32615 Pipe Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (UTS) | 550 min / 620 typ | MPa |
| Yield Strength (0.2% Proof) | 220 min / 250 typ | MPa |
| Elongation at Break | 25 min / 28 typ | % |
| Reduction in Area | 46 | % |
| Brinell Hardness | 170 | HB |
| Elastic (Young’s) Modulus | 190 | GPa |
| Shear Modulus | 75 | GPa |
| Poisson’s Ratio | 0.28 | — |
| Fatigue Strength | 180 | MPa |
| Shear Strength | 400 | MPa |
UNS S32615 Pipe Physical Properties
| Property | Value | Unit |
|---|---|---|
| Density | 7.6 | g/cm³ |
| Melting Point (Solidus) | 1310 | °C |
| Melting Point (Liquidus) | 1350 | °C |
| Specific Heat Capacity | 500 | J/kg·K |
| Thermal Expansion Coefficient | 15 | μm/m·K |
| Thermal Conductivity | 11–21 | W/m·K |
| Electrical Resistivity | 0.55 | Ohm·mm²/m |
| Latent Heat of Fusion | 370 | J/g |
UNS S32615 Fittings – Heat Treatment
Solution Annealing: Heat to 1050–1150°C followed by rapid water quenching. UNS S32615 cannot be hardened by heat treatment; its strength is achieved through alloying and cold working.
UNS S32615 Fittings Equivalent / Cross Reference Standards
| Standard | Designation | Country |
|---|---|---|
| UNS | S32615 | USA |
| ASTM | A182 F63 | USA |
| ASTM | A403 WP S32615 | USA |
| ASTM | SA-403 UNS S32615 | USA |
UNS S32615 Fittings Applicable Standards
| Standard | Description |
|---|---|
| ASTM A403 | Wrought Austenitic Stainless Steel Fittings |
| ASME SA-403 | ASME equivalent of ASTM A403 |
| ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.11 | Forged Fittings, Socket-Welding and Threaded |
| MSS SP-43 | Standard Practice for Lightweight Stainless Steel Butt-Welding Fittings |
UNS S32615 Fittings Pitting Resistance
| Property | Value |
|---|---|
| PREN (Pitting Resistance Equiv.) | 21 |
| Max Temperature (Corrosion) | 410 °C |
| Max Temperature (Mechanical) | 990 °C |
UNS S32615 Pipe Applications
Chemical Processing
Used as elbows, tees, and reducers in acid piping networks and process loops handling corrosive chemicals.
Acid Production Plants
Applied as pipeline fittings connecting absorber, cooler, and storage system lines in sulfuric acid production.
Pulp & Paper Industry
Suitable for fittings used in bleach plant and acid chemical distribution piping systems.
Petrochemical Industry
Used as corrosion-resistant fittings in aggressive refinery process piping applications.
Pickling & Surface Treatment
Used in fittings for acid circulation and rinse water piping systems in surface treatment operations.
Pharmaceutical Industry
Ideal for high-purity fittings on chemical synthesis and reagent transfer piping lines.
Power Generation
Employed as fittings for chemical dosing and corrosive fluid handling systems in power plants.
Marine & Offshore
Seawater handling and chemical injection pipe systems on marine and offshore installations.
Fertilizer Plants
Applied as fittings for phosphoric acid and ammonium sulfate process piping in fertilizer plants.
Mining & Hydrometallurgy
Used as fittings for acid leach solution transfer and process pipework in mining operations.
Waste Treatment
Used as fittings for chemical dosing and corrosive fluid handling systems in waste treatment plants.
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