UNS S32615 tube has an excellent corrosion performance in concentrated sulfuric acid and mixed acid condition hence it is used as a heat exchanger, condensers and related chemical processing equipment. The combination of silicon and copper in it makes it better in resistance to oxidizing and reducing acids. Manufactured in full compliance with the UNS S32615 material specification, these tubes are available in seamless and welded designs in a wide range of sizes and wall thicknesses to provide high quality service to the industry in accordance to ASTM and other standards in the world.
UNS S32615 Tube 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 | A213 S32615 | USA |
| ASTM | A312 S32615 | USA |
| ASTM | A959 S32615 | USA |
| ASME | SA-312 UNS S32615 | USA |
| ASTM | A182 F63 | USA |
UNS S32615 Tube Applicable Standards
| Standard | Description |
|---|---|
| ASTM A213 | Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tubes |
| ASTM A249 | Welded Austenitic Steel Boiler, Superheater, Heat Exchanger and Condenser Tubes |
| ASME SA-213 | ASME equivalent of ASTM A213 |
| ASTM A999 | General Requirements for Alloy and Stainless Steel Pipe |
UNS S32615 Tube Pitting Resistance
| Property | Value |
|---|---|
| PREN (Pitting Resistance Equiv.) | 21 |
| Max Temperature (Corrosion) | 410 °C |
| Max Temperature (Mechanical) | 990 °C |
UNS S32615 Tube Applications
Chemical Processing
Used as heat exchanger and condenser tubes in acid service environments requiring superior corrosion resistance.
Sulfuric Acid Plants
Applied as boiler and superheater tubes in highly corrosive acid processing operations.
Pulp & Paper Industry
Suitable for digester and bleaching plant tubular components exposed to aggressive chemical media.
Petrochemical Industry
Used as process tubes in reactors and corrosive fluid heat transfer systems across refining facilities.
Pharmaceutical Industry
Ideal for tubes handling aggressive solvents and chemical reagents in pharmaceutical manufacturing.
Power Generation
Employed as boiler tubes and heat exchanger components in high-corrosion service environments.
Food & Beverage Industry
Applied in tubular systems exposed to acidic cleaning agents and processing media.
Desalination Plants
Used as heat exchanger tubing in seawater and brine handling environments.
Fertilizer Industry
Applied in tubes used in phosphoric acid and ammonium sulfate production units.
Metal Finishing
Used in tubing for acid pickling and electroplating process systems.
