Name: UNS S32615 Pipe | ASTM A312 High-Silicon Stainless Steel Pipe - Solitaire Overseas
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UNS S32615 Pipe

UNS S32615 Pipe is a highly corrosive media-resistant pipe made of high-silicon austenitic stainless steel. This alloy has good performance, as detailed in the UNS S32615 Specifications, because it has silicon content ranging between 4.8 and 6.0 percent and copper additions of 1.5-2.5 percent in aggressive chemical process environments compared to conventional stainless grades.

UNS S32615 pipes come in seamless and welded options in both ASTM A312 and ASME SA-312 versions, which is why they are the standard of choice in chemical plants, acid production lines, and pickling facilities where the pressure integrity of a pipe is required, as well as pickling facilities in which the long-term corrosion resistance of a choice is essential.

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UNS S32615 Pipe Specifications

Parameter	Details
Grade	UNS S32615
Product Form	UNS S32615 Pipe
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 Pipe 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 Pipe 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 Pipe

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

Sulfuric acid and hydrochloric acid transfer lines in chemical processing plants.
Process piping in sulfuric acid manufacturing and concentrated acid service.
Pulp and paper industry piping handling bleaching chemicals and acid liquors.
Pickling bath circuits and acid rinse systems in metal finishing operations.
Petrochemical refinery service lines with high-corrosion exposure.
Cooling and condensate pipes in power generation facilities.
Chemical injection and seawater handling lines on marine/offshore installations.

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

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