Name: UNS S32615 Round Bar | High-Silicon Stainless Steel Bar for Machined Components
Brand: Solitaire Overseas

UNS S32615 Round Bar

UNS S32615 Round Bar is a hot-rolled or forged high-silicon austenitic stainless steel designed bar product that is used in machined components and fasteners in corrosive chemical environments, provided in Solitaire Overseas. This grade is available in solid round and hexagonal profile and provides a minimum tensile strength of 550 Mpa and high machinability in solution-annealed state.

UNS S32615 round bar, which is used as the raw material in producing pump shafts, valve stems, flanges, and custom machined parts, offers the same performance in terms of sulfuric acid and reducing acid resistance as other product forms, making it possible to have complete material traceability and consistency across the chemical plant equipment.

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UNS S32615 Round Bar Mechanical Properties

UNS S32615 achieves its mechanical performance through alloying and cold working. The alloy cannot be hardened by heat treatment; solution annealing at 1050–1150°C followed by water quenching is the standard heat treatment to restore 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

Chemical Composition of UNS S32615 Round Bar

The table below details the elemental composition of UNS S32615 in accordance with 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	—

Specifications of UNS S32615 Round Bar

Parameter	Details
Grade	UNS S32615
Product Form	UNS S32615 Round Bar
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 1050–1150°C + Water Quench
Density	7.6 g/cm³
Hardness	170 HB

Applications and Uses of UNS S32615 Round Bar

The high-silicon and copper chemistry of UNS S32615 makes it the preferred alloy across the following industries and services:

Pump shafts and impeller components in sulfuric acid plant service.
Valve stems, spindles, and body blanks for acid-resistant valve assemblies.
Fasteners, bolts, and studs for flanged joints in corrosive chemical piping.
Machined nozzle connections and boss fittings for acid storage vessels.
Agitator shafts and mixing equipment components in chemical reactors.
Precision-machined parts for pharmaceutical processing equipment.
Bar stock for turned components in pickling line and surface treatment equipment.

Solitaire Overseas supplies the full range of UNS S32615 products. Explore related grades below:

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