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UNS S32654 - EN 1.4539

S32654. also known as 1.4539 or UNS S32654. is a super duplex stainless steel (SDSS) with a higher percentage of chromium, nickel, molybdenum, and nitrogen compared to standard duplex stainless steels. It offers superior corrosion resistance, particularly in aggressive environments such as seawater, chloride solutions, and sulfuric acid.

GB/T ISO ASTM TOCT DIN JIS

National rules model：

Unified Numbering System (UNS): S32654

American Society for Testing and Materials (ASTM): ASTM A240/A240M S32654

European Norm (EN): 1.4539

JIS Standard: JIS G 4305 SUS 329J3L

Chemical Composition:

Chromium (Cr): 25.0-26.5%

Nickel (Ni): 6.0-7.5%

Molybdenum (Mo): 3.0-4.0%

Nitrogen (N): 0.22-0.30%

Manganese (Mn): ≤1.5%

Silicon (Si): ≤0.50%

Phosphorus (P): ≤0.03%

Sulfur (S): ≤0.02%

Carbon (C): ≤0.03%

Physical Properties:

Density: Approximately 8.0 g/cm³

Melting Point: Around 1390-1420°C

Coefficient of Thermal Expansion: 12.8 x 10⁻⁶ /°C (at room temperature)

Mechanical Properties:

Tensile Strength: 800-1000 MPa

Yield Strength: 550-650 MPa

Elongation: ≥20%

Hardness: Approximately HB 260-310 (Rockwell B scale)

Application Areas:

Chemical and Process Industry: Used in the manufacturing of equipment and components that come into contact with highly corrosive chemicals, such as pickled food processors, paper industry bleaching equipment, and chemical reactor vessels.

Marine Applications: Suitable for applications in maritime environments, including offshore platforms, propellers, and heat exchangers in seawater.

Oil and Gas Industry: Resistant to the corrosive challenges present in oil and gas refineries, pipelines, wells, and subsea production systems.

Desalination Plants: Employed in heat exchangers and piping systems due to its high resistance to pitting and crevice corrosion.

Pulp and Paper Industry: Utilized in equipment and components that handle corrosive chemicals in the pulp and paper manufacturing process.

Food Processing: Used in equipment that processes acidic or chloride-containing foods where both high strength and corrosion resistance are required.

S32654 stainless steel is valued for its excellent combination of strength, corrosion resistance, and fabricability, making it suitable for a variety of demanding applications. The specific chemical composition, physical, and mechanical properties may vary as per different standards and manufacturers, so the information provided is intended for general guidance.

Common Surfaces

Stainless Steel Standards Comparison Table

STS	USA	UNS	CHINA	EURONORM		RUSSIA	SWEDISH	JAPANESE
GRADE	AISI/ASTM	NO	GB	NO	NAME	GOST	SS	JIS
201	201	S20100	12Cr17Mn6Ni5N	1.4372	-	-	-	SUS 201
301	301	S30100	12Cr17Ni7	1.4310	X 12 CrNi 17 7	-	2331	SUS 301
303	303	S30300	1Cr18Ni9MoZr	1.4305	X 10 CrNiS 18 9	-	2346	SUS 303
304	304	S30400	06Cr18Ni9	1.4301	X 6 CrNi 18 10	08KH18N10 06KH18N11	2332	SUS 304
304L	304L	S30403	022Cr19Ni10	1.4307	X 3 CrNi 18 10	03KH18N11	2352	SUS 304L
316	316	S31600	0Cr17Ni12Mo2	1.4401	X 6 CrNiMo 17 12 2	-	2347	SUS 316
316L	316L	S31603	022Cr17Ni12Mo2	1.4404	X 3 CrNiMo 17 12 2	-	2348	SUS 316L
316Ti	316Ti	S31635	0Cr18Ni12Mo2Ti	1.4571	X 6 CrNiMoTi 17 12 2	08KH17N13M2T 10KH17N13M2T	2350	-
321	321	S32100	0Cr18Ni11Ti	1.4541/1.4878	X 6 CrNiTi 18 10	12KH18N10T	2337	SUS 321
347	347	S34709	0Cr18Ni11Nb	1.4550	X 6 CrNiNb 18 10	-	2338	SUS 347
309S	309S	S30908	0Cr23N13	1.4833	X 6 CrNi 22 13	20KH23N18	-	SUS 309S
310S	310S	S31008	06Cr25Ni20	1.4842	X 6 CrNi 25 20	20KH25N20S2	2361	SUS 310S
416	416	S41600	Y1Cr13	1.4005	X12CrS13	-	2380	SUS 416
2205	2205	S32205/S31803	00Cr22Ni5Mo3N	1.4462	X2CrNiMoN22-5-3	02Ch22N5AM2	2377	SUS 329J3L
2507	2507	S32750	00Cr25Ni7Mo4N	1.4410	X 2 CrNiMoN 25-7-4	-	-	-
904L	904L	N08904	-	1.4539	-	-	-	-
254SMO	254SMO	S31254	-	1.4547	X1CrNiMoCuN20-18-7	-	2378	-
253MA	253MA	S30815	-	1.4835	X9CrNiSiNCe21-11-2	-	2368	-
17-4PH/630	17-4PH/630	S17400	0Cr17Ni4Cu4Nb	1.4542	X5CrNiCuNb16-4	05Ch16N4D2B	-	SUS630

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