Name: UNS S32615 Tube | ASTM A213 High-Silicon Heat Exchanger Tubes
Brand: Solitaire Overseas

UNS S32615 Tube

UNS S32615 Tube is a high-silicon stainless steel tubular product of high precision-engineered designed to be used in heat exchange, boiler and superheater service under the most harsh conditions of corrosiveness. Following the UNS S32615 Specifications, Solitaire Overseas is manufactured to both ASTM A213 and ASME SA-213 and is available in seamless form with tight dimensional tolerances and completely heat-treated.

The high silicon (4.8-6.0%) and copper (1.5-2.5) makes it highly resistant to an acid attack and its austenitic microstructure makes it very tough and weldable throughout a wide temperature span between cryogenic to 990 degC.

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UNS S32615 Tube Chemical Composition

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	—

UNS S32615 Tube 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

Industrial Applications of UNS S32615 Tube

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

Shell-and-tube heat exchangers handling acid condensates and aggressive process streams.
Superheater and boiler tubes in acid manufacturing and chemical plants.
Instrumentation and small-bore process tubing in corrosive chemical environments.
Pharmaceutical synthesis reactors requiring high-purity, corrosion-resistant tubing.
Fertilizer plant heat exchangers in phosphoric and nitric acid service.
Petrochemical distillation column internals and condenser tubes.
Offshore chemical injection tubing and umbilical systems.

UNS S32615 Tube Specifications

Parameter	Details
Grade	UNS S32615
Product Form	UNS S32615 Tube
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

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

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