UNS S32615 round bar is a solid high-alloy austenitic stainless steel product that is presented to have superior sulfuric acid and corrosive chemical resistance. Its high silicon and copper content renders it a perfect fit in machining high precision parts like shafts, fasteners, valve parts, and pump parts which are used in the chemical processing industries. UNS S32615 round bars are available in a broad selection of sizes and are designed to comply with ASTM requirements and offer tremendous machinability, welding, and long life in hostile service environments.
UNS S32615 Round Bar 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 Round Bar 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 Round Bar 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 Round Bar – Heat Treatment
Solution Annealing: Round bars are solution annealed at 1050–1150°C and rapidly quenched in water. The alloy cannot be hardened by heat treatment; its strength is derived from its alloying content and cold working operations.
UNS S32615 Round Bar Equivalent / Cross Reference Standards
| Standard | Designation | Country |
|---|---|---|
| UNS | S32615 | USA |
| ASTM | A479 S32615 | USA |
| ASTM | A182 F63 | USA |
| ASME | SA-479 UNS S32615 | USA |
| ASTM | A959 S32615 | USA |
UNS S32615 Round Bar Applicable Standards
| Standard | Description |
|---|---|
| ASTM A479 | Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels |
| ASME SA-479 | ASME equivalent of ASTM A479 |
| ASTM A182 | Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves |
| ASTM A276 | Stainless Steel Bars and Shapes |
UNS S32615 Round Bar Pitting Resistance
| Property | Value |
|---|---|
| PREN (Pitting Resistance Equiv.) | 21 |
| Max Temperature (Corrosion) | 410 °C |
| Max Temperature (Mechanical) | 990 °C |
UNS S32615 Round Bar Applications
Chemical Processing
Used for machined shafts, spindles, and components in acid-resistant pump and valve assemblies for chemical plants.
Sulfuric Acid Plants
Applied as corrosion-resistant bar stock for custom machined parts used in acid service environments.
Pulp & Paper Industry
Suitable for roller shafts, agitator components, and bleach plant parts machined from round bar.
Petrochemical Industry
Used as bar material for machined fittings, nozzles, and corrosion-resistant mechanical components in refineries.
Pharmaceutical Industry
Ideal as bar stock for precision machined components used in chemical synthesis equipment.
Fastener Manufacturing
Applied in the machining of bolts, studs, nuts, and threaded fasteners for corrosive service environments.
Valve & Pump Manufacturing
Used for stems, seats, and body components machined from round bar for acid service duty.
Mining & Hydrometallurgy
Applied as bar stock for agitator shafts, impellers, and wear parts in acid leach systems.
Marine & Offshore
Used as corrosion-resistant bar for marine hardware and offshore chemical handling components.
General Engineering
Applied in the production of precision machined parts requiring high corrosion resistance in aggressive chemical media.
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