UNS S32615 Fittings
UNS S32615 Fittings are Fittings made of high-silicon austenitic stainless steel used as piping fittings in acid and chemical process piping systems. They are used on elbows, tees, reducers, caps, and couplings to both ASTM A403 / ASME SA-403 and are made using the same high-performance alloy composition as UNS S32615 pipe - 4.8-6.0% silicon and 1.5-2.5% copper - to ensure corrosion resistance all the way through the piping circuit. Offering seamless and welded versions, including short radius and long radius versions, they are matched to the specific layout and pressure needs of to the chemical plants, acid production lines and industrial process installations.
UNS S32615 Fittings Specifications
| Parameter | Details |
|---|---|
| Grade | UNS S32615 |
| Product Form | UNS S32615 Fittings |
| Standard | ASTM A403 / ASME SA-403 |
| 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 Fittings 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 Fittings 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 Fittings
- Elbow and bend fittings in sulfuric acid transfer piping circuits
- Tee and cross fittings for chemical process header distribution
- Reducers connecting different diameter acid service pipe runs
- End caps and closures for acid line isolation and maintenance
- Stub ends for lap-joint flange assemblies in corrosive service
- Couplings and unions in chemical injection and dosing systems
- Return bends and U-bends in acid heat exchanger piping circuits
UNS S32615 Products
Available from USA Piping Solutions
