UNS S32615 Tube
UNS S32615 Tube is a high silicon austenitic stainless steel tube suitable in transferring heat and process fluid use in harshly corrosive environments. This alloy has a 4.8-6.0 percent composition of silicon and 1.5-2.5 percent copper which offers excellent resistance to concentrated sulfuric acid and mixed acid systems. UNS S32615 tube is also supplied in seamless and welded formats as ASTM A213 / ASME SA-213, the material of choice of heat exchangers, condensers, and instrumentation in chemical plants, and acid production facilities and other industrial process systems where standard stainless materials fail to perform.
UNS S32615 Tube Specifications
| Parameter | Details |
|---|---|
| Grade | UNS S32615 |
| Product Form | UNS S32615 Tube |
| Standard | ASTM A213 / ASME SA-213 / ASTM A249 |
| 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 Tube 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 Tube Mechanical Properties
UNS S32615 achieves its mechanical performance through alloying and cold working. 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 Tube
- Shell-and-tube heat exchangers handling concentrated sulfuric acid
- Condenser and evaporator tubing in acid production plants
- Instrumentation and impulse tubing in corrosive process lines
- Superheater and reheater tubes in chemical recovery boilers
- Coil tubing for acid heating and cooling circuits
- Process fluid transfer tubing in pickling and annealing lines
- Jacketed tubing in high-purity chemical synthesis applications
UNS S32615 Products
Available from USA Piping Solutions
