Name: UNS S32615 Fittings | ASTM A403 Buttweld Elbows, Tees & Reducers
Brand: Solitaire Overseas

UNS S32615 Fittings

Solitaire Overseas manufactures UNS S32615 Fittings, a high-silicon austenitic alloy conforming toUNS S32615 Specifications, in the form of buttweld elbows, tees, reducers, and caps to ASTM A403 and MSS SP-43 standards. Engineered to be used with UNS S32615 pipe systems, these fittings provide complete chemical and mechanical compatibility in sulfuric acid, hydrochloric acid and mixed acid service piping systems.

Silicon and copper high pitting and overall corrosion resistance in oxidising and reducing acid composition is also received; the austenitic structure makes fittings ductile and weldable to meet complex chemical plant designs.

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UNS S32615 Fittings Specifications

Parameter	Details
Grade	UNS S32615
Product Form	UNS S32615 Fittings
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 Fittings Industrial Applications

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

Buttweld elbows and tees in concentrated sulfuric acid pipeline systems.
Reducers and couplings for acid transfer lines in chemical production facilities.
Fittings for pickling bath piping in metal finishing and galvanising plants.
High-purity pharmaceutical process pipeline fittings for corrosive reagents.
Fertilizer plant acid distribution network fittings in phosphoric acid service.
Petrochemical plant crossovers and branch connections in corrosive streams.
Offshore chemical injection system fittings for subsea and topside service.

Mechanical Properties of UNS S32615 Fittings

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

UNS S32615 Fittings 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	—

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

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