Name: UNS S32615 Flanges | ASTM A182 F63 Weld Neck & Blind Flanges
Brand: Solitaire Overseas

UNS S32615 Flanges

UNS S32615 Flanges These flanges are machined high-silicon austenitic stainless steel flanges, that are supplied by Solitaire Overseas to ASTM A182 F63 specification, including weld neck, slip-on, blind, socket weld and threaded flanges. These flanges are manufactured to ASME B16.5 dimensional specifications to offer a leak free, corrosion resistant, joint system to very challenging acid service piping systems.

Silicon 4.8-6.0% combined with copper 1.5-2.5% gives higher levels of resistance to sulfuric acid corrosion at higher temperatures and therefore UNS S32615 flanges are essential in acid plant, chemical processing, and industrial pickling piping systems.

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UNS S32615 Flanges 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 Flanges Specifications

Parameter	Details
Grade	UNS S32615
Product Form	UNS S32615 Flanges
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

UNS S32615 Flanges Applications and Uses

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

Weld neck and blind flanges on sulfuric acid plant main process piping.
Slip-on flanges for acid storage tank nozzle connections.
High-pressure flanged joints in chemical reactor inlet and outlet nozzles.
Instrumentation flanges for flow and pressure measurement in acid media.
Flanged joints on heat exchanger nozzles in acid condensate service.
Offshore pipeline flanges for chemical injection and produced water systems.
Pharmaceutical process line flanges requiring traceability and mill certification.

UNS S32615 Flanges 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

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

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