UNS S32001 vs. 304 vs. 316L Stainless Steel: Key Differences

What is UNS S32001 duplex stainless steel?

UNS S32001 (also known as EN 1.4482 or SS LD24) is a low-alloy duplex stainless steel designed as a cost-effective, high-strength alternative to standard austenitic stainless steels such as 304 or 316L. Its yield strength is approximately twice that of conventional stainless steel, while also offering good corrosion resistance and excellent weldability. This grade complies with standards such as ASTM A240, ASME SA240, and EN 10088-2, ensuring its suitability for pressure vessel and structural applications.

 

Which is better, 304 or 316L stainless steel?

‌316L stainless steel‌ is based on 304 stainless steel with the addition of ‌2%~3% molybdenum‌ (Mo), and has a ‌lower carbon content‌, giving it significantly better corrosion resistance than ‌304‌. ‌304 stainless steel‌ is sufficient for use in ordinary atmospheric conditions, fresh water, and mildly corrosive environments‌, but it is prone to pitting corrosion or rusting in high-chloride environments‌‌. In contrast, ‌316L stainless steel‌ is suitable for chloride-containing environments (such as seawater, de-icing salts, and coastal areas)‌‌ as well as acidic or high-salinity media.

 

 

 

 

UNS S32001 vs. 304 vs. 316L Stainless Steel:chemical composition

Grade	Carbon	Chromium	Nickel	Molybdenum	Manganese	Nitrogen	Silicon	Phosphorus	Sulfur	Structure Type
UNS S32001	≤0.04	19.5–21.5	1.0–3.0	≤0.8	4.0–6.0	0.05–0.17	≤1.0	≤0.04	≤0.015	Duplex
304 Stainless Steel	≤0.08	18.0–20.0	8.0–10.5	-	≤2.0	≤0.10	≤1.0	≤0.045	≤0.03	Austenitic
316L Stainless Steel	≤0.03	16.0–18.0	10.0–14.0	2.0–3.0	≤2.0	≤0.10	≤1.0	≤0.045	≤0.03	Austenitic

 

UNS S32001 vs. 304 vs. 316L Stainless Steel: Mechanical Properties 

Property	UNS S32001	AISI 304	AISI 316L
Yield Strength (0.2% MPa)	≥ 450	≥ 205	≥ 170
Tensile Strength (MPa)	≥ 660	≥ 515	≥ 485
Elongation (A50, %)	≥ 30	≥ 40	≥ 40
Hardness (Brinell HBW)	≤ 290	≤ 201	≤ 217

 

UNS S32001 vs. 304 vs. 316L Stainless Steel: Corrosion Resistance 

UNS S32001 (a lean duplex stainless steel) offers the highest strength and superior general corrosion resistance, especially against stress corrosion cracking, compared to 304 and 316L. While 316L provides superior resistance to chlorides and pitting, S32001 performs better than 304. 304 is best for general, low-corrosion environments.

Feature	UNS S32001	AISI 304	AISI 316L
PREN Index (Approx.)	22 – 25	18 – 20	24 – 26
SCC Resistance	Excellent	Poor	Moderate
Pitting Resistance	High	Moderate	High

 

UNS S32001 vs. 304 vs. 316L Stainless Steel: Weldability

UNS S32001 (lean duplex) offers superior strength and good weldability, often acting as a cost-effective alternative to 304/316L, but it requires stricter heat input control (0.5–2.5 kJ/mm) to maintain its 50/50 austenite-ferrite balance. While 304 and 316L (austenitic) are easier to weld without special precautions, S32001 provides better stress corrosion cracking resistance.

 

Is S32001 stainless steel magnetic?

Yes. Unlike austenitic stainless steels 304 and 316L (which are non-magnetic), S32001 stainless steel has a duplex structure (approximately 50% ferrite and 50% austenite), and therefore is magnetic. This is an advantage in some industrial applications requiring magnetic separation or magnetic detection.

 

UNS S32001 vs. 304 vs. 316L Stainless Steel: Key Applications

UNS S32001: Structural components, water tanks, oil and gas piping, and architecture.
316L: Marine environments, pharmaceutical manufacturing, and chemical processing (high acid), notes .
304/304L: Kitchen equipment, food processing, and general-purpose architecture.

 

If you have any project requirements for UNS S32001 stainless steel sheet, please feel free to place an order. GNEE has a large inventory of popular products for your selection. It can be processed into various hot-rolled and cold-rolled forms. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.

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UNS S32001 Stainless SteelSheet Specification

Product Form	Thickness Range (mm)	Width Range (mm)	Length / Form	Surface Finish Options
Cold Rolled (CR) Sheet	0.5 mm – 3.0 mm	1000, 1219, 1500	2000, 2438, 3000, 6000	2B, BA, No.4, Hairline (HL), Mirror
Hot Rolled (HR) Plate	3.0 mm – 50.0 mm	1500, 1800, 2000	3000, 6000, 9000, 12000	No.1 (Pickled & Annealed)
Stainless Steel Coil	0.5 mm – 12.0 mm	1000, 1219, 1500, 2000	Continuous Coil	2B, No.1
Strip / Precision Strip	0.3 mm – 3.0 mm	20 mm – 600 mm	Coil or Cut-to-length	2B, BA, Polished
Checkered Plate	3.0 mm – 8.0 mm	1219, 1250, 1500	2438, 3000, 6000	Tear Drop, Diamond, Mandorla