UNS S32615 Pipe
UNS S32615 Pipe is a highly resistant to corrosion pipe that is made of high-silicon austenitic stainless steel designed to be used in the aggressive chemical environment. The silicon content of the alloy is 4.8-6.0 percent and the copper content ranges 1.5-2.5 percent which gives it better resistance to sulfuric acid, hydrochloric acid and other highly corrosive media that the conventional stainless grades succumb to quickly. UNS S32615 pipe is available in seamless and welded both per ASTM A312 / ASME SA-312 with pressure integrity and long-term corrosion resistance of process piping systems with high requirements.
High-Silicon Grade
Acid Resistance Support
Mechanical Temperature
Corrosion Temperature
UNS S32615 Pipe Specifications
| Parameter | Details |
|---|---|
| Grade | UNS S32615 |
| Product Form | UNS S32615 Pipe |
| Standard | ASTM A312 / ASME SA-312 / ASTM A213 |
| Applicable Spec | ASTM A999, ASTM A959 |
| Max Temp (Mechanical) | 990 C |
| Max Temp (Corrosion) | 410 C |
| PREN | 21 |
| Heat Treatment | Solution Annealed 1050-1150C + Water Quench |
| Density | 7.6 g/cm3 |
| Hardness | 170 HB |
UNS S32615 Pipe Chemical Composition
Elemental composition per ASTM A959 and UNS designation requirements:
| 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
UNS S32615 achieves its mechanical performance through alloying and cold working. The alloy cannot be hardened by heat treatment; solution annealing at 1050-1150C followed by water quenching restores optimum corrosion resistance.
| 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 |
Applications and Uses of UNS S32615 Pipe
- Sulfuric acid and hydrochloric acid transfer lines in chemical processing plants
- Process piping in sulfuric acid manufacturing and concentrated acid service
- Pulp and paper industry piping handling bleaching chemicals and acid liquors
- Pickling bath circuits and acid rinse systems in metal finishing operations
- Petrochemical refinery service lines with high-corrosion exposure
- Cooling and condensate pipes in power generation facilities
- Chemical injection and seawater handling lines on marine/offshore installations
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