UNS S32615 flanges are manufactured to fit in piping systems that are subject to severe corrosion whereby sulfuric and other corrosive gases are crucial. These flanges are made of high-silicon and high-copper austenitic stainless steel and are designed to provide leak-proof connections and provide long service life in harsh chemical processing conditions. They come in a slip-on, weld neck, blind, and other designs that are produced in accordance to ASME B16.5 and other global standards and are therefore applicable in high pressure and high temperature applications.
UNS S32615 Flanges 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 Tube 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 Tube 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 Tube – Heat Treatment
Solution Annealing: Heat to 1050–1150°C followed by rapid water quenching. This process relieves internal stresses and restores the alloy’s full corrosion resistance after fabrication.
UNS S32615 Tube Equivalent / Cross Reference Standards
| Standard | Designation | Country |
|---|---|---|
| UNS | S32615 | USA |
| ASTM | A182 F63 | USA |
| ASTM | SA-182 F63 | USA |
| ASTM | A959 S32615 | USA |
UNS S32615 Tube Applicable Standards
| Standard | Description |
|---|---|
| ASTM A182 | Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves |
| ASME SA-182 | Welded Austenitic Steel Boiler, Superheater, Heat Exchanger and Condenser Tubes |
| ASME B16.5 | Pipe Flanges and Flanged Fittings: NPS ½ Through NPS 24 |
| ASME B16.47 | Large Diameter Steel Flanges: NPS 26 Through NPS 60 |
| MSS SP-44 | Steel Pipeline Flanges |
UNS S32615 Tube Pitting Resistance
| Property | Value |
|---|---|
| PREN (Pitting Resistance Equiv.) | 21 |
| Max Temperature (Corrosion) | 410 °C |
| Max Temperature (Mechanical) | 990 °C |
UNS S32615 Flanges Applications
Chemical Processing
Used as flange connections on vessels, reactors, and acid process pipelines in chemical manufacturing.
Sulfuric Acid Plants
Applied as flanged joints in absorber towers, acid coolers, and storage tank nozzles in sulfuric acid production.
Pulp & Paper Industry
Suitable for flanged connections in bleach plant and acid chemical feed systems throughout paper production.
Petrochemical Industry
Used as high-corrosion flange joints in aggressive chemical service pipework across refinery operations.
Pharmaceutical Industry
Ideal for hygienic and chemically resistant flanged piping connections in pharmaceutical processing.
Power Generation
Used as flanges on chemical dosing and acid cleaning system piping in power generation facilities.
Desalination Plants
Used as heat exchanger tubing in seawater and brine handling environments.
Fertilizer Industry
Applied as flanged connections on phosphoric acid and mixed acid process lines in fertilizer manufacturing.
Metal Finishing
Used in tubing for acid pickling and electroplating process systems.
Mining & Hydrometallurgy
Applied as flanged pipeline joints in acid leach and solvent extraction circuits in mining operations.
Desalination Plants
Used as corrosion-resistant flanged connections in chemical injection systems at desalination facilities.
Waste Treatment Facilities
Applied as flanged joints on aggressive effluent pipelines and chemical dosing systems.
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