UNS S32615 pipe is a high-alloy austenitic stainless steel, which is characterized by the high-resistance to sulfuric acid and other highly corrosive conditions. It contains a high level of silicon and copper, thereby working better than the standard grades in harsh chemical processing conditions. Fully compliant with the UNS S32615 material specification, these pipes are commonly used in chemical plants and acid making facilities and pickling lines where corrosion resistance is a major concern. UNS S32615 pipes are available in seamless and welded versions and have strict international standards, which allow them to be reliable in the high-pressure and high-temperature environments.
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 Pipe – 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 Pipe 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 Pipe Applicable Standards
| Standard | Description |
|---|---|
| ASTM A312 | Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes |
| ASTM A213 | Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tubes |
| ASME SA-312 | ASME equivalent of ASTM A312 |
| ASTM A999 | General Requirements for Alloy and Stainless Steel Pipe |
UNS S32615 Pipe 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
Transfer lines for sulfuric acid, hydrochloric acid, and mixed acids in aggressive chemical process environments.
Acid Production Plants
Process piping in sulfuric acid manufacturing units where extreme corrosion resistance is essential.
Pulp & Paper Industry
Piping systems handling bleaching chemicals and acid liquors throughout the production process.
Petrochemical Industry
High-corrosion service lines across refining and chemical processing facilities.
Pickling & Surface Treatment
Pipe systems carrying pickling baths and acid rinse solutions in metal finishing operations.
Pharmaceutical Industry
Process piping transporting corrosive reagents and chemicals used in pharmaceutical synthesis.
Power Generation
Cooling and process pipes operating in corrosive service environments within power plants.
Marine & Offshore
Seawater handling and chemical injection pipe systems on marine and offshore installations.
Fertilizer Plants
Piping for phosphoric acid and nitric acid process lines in fertilizer production facilities.
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