Is S31803 the same as 2205?

What is equivalent to grade 2205?

Grade 2205 (also known as Alloy 2205) is a duplex stainless steel commonly designated as UNS S32205 or UNS S31803, and it is formally designated as DIN 1.4462 or ASTM A182 F60. It is widely used for its high corrosion resistance and strength, often serving as an improved, higher-performance alternative to 316L or 317L stainless steel.

 

What is equivalent to S31803?

UNS S31803 is a 22% chromium duplex stainless steel primarily known as 2205 or SAF 2205, with key equivalents including DIN 1.4462 (X2CrNiMoN22-5-3) and ASTM A182 F51. It is often upgraded or dual-certified as UNS S32205 / F60, which provides tighter control over composition for improved corrosion resistance.

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
2205	S31803 / S32205	318S13	-	1.4462	X2CrNiMoN22-5-3	2377	SUS 329J3L

 

Is S31803 the same as 2205?

Yes, UNS S31803 and Duplex 2205 refer to the same material. Although UNS S32205 also belongs to the 2205 series and is frequently dual-certified with S31803, S31803 represents the original and more widely established specification for this standard grade.

 

S31803 vs S32205 chemicalcomposition

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
2205 (S31803)	Min Max	- 0.030	- 2.00	- 1.00	- 0.030	- 0.020	21.0 23.0	2.5 3.5	4.5 6.5	0.08 0.20
2205 (S32205)	Min Max	- 0.030	- 2.00	- 1.00	- 0.030	- 0.020	22.0 23.0	3.0 3.5	4.5 6.5	0.14 0.20

 

S31803 Grade Stainless Steel: Mechanical Properties

Grade	Tensile Str (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell C (HR C)	Brinell (HB)
2205/S31803	621	448	25	31 max	293 max

 

Temperature Range Of UNS S31803

Grade	Temperature
UNS S31803	1020-1100°C/ 1868-2012°F

 

Astm A790 UNS S31803 Specification

Grade	UNS	Duplex Industry Specifications
SAF 2205® 22Cr	UNS S31803	ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815 ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988 SAE J405

 

UNS S31803 Thermal Conductivity

Properties	Metric	Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F)	13.7 µm/m°C	7.60 µin/in°F

 

Duplex UNS S31803 Properties

Properties	Imperial	Metric
Duplex Steel S31803 Material Density	0.283 lb/in³	7.82 g/cm³

 

Duplex Steel UNS S31803 Allowable Stress

200F – 25.7 ksi	300F – 24.8 ksi	400F – 23.9 ksi
500F – 23.3 ksi	600F – 23.1 ksi

 

Is 2205/S31803 better than 316L?

Yes, in terms of strength and pitting resistance. 2205 has nearly double the yield strength of 316L and a much higher PREN (35 vs. 24). It is the superior choice for marine environments, oil & gas, and chemical processing.

Is S31803/2205 magnetic?

Yes. Because it contains approximately 50% Ferrite (the magnetic phase of steel), Duplex 2205 is strongly magnetic. This is a key difference from the 300-series austenitic steels (like 304 or 316), which are non-magnetic.

 

UNS S31803/S32205 Pipe Distributor

GNEE Stainless Steel maintains a standing inventory of over 1,000 tons of duplex stainless steel, supporting rapid global shipping. Equipped with in-house processing capabilities, we offer services including beveling, threading, and custom-length cutting (up to 12 meters). We provide Mill Test Certificates (MTCs) compliant with the EN 10204 3.1 standard, ensuring full traceability throughout the entire process.

Click to Get Pricing for UNS S31803/S32205 Pipe

UNS S31803/S32205 Pipe Specifications

Product Form	Technical Standard	Size Range	Key Features
Seamless Pipe	ASTM A790, ASME SA790	OD: 6mm - 630mm; WT: 0.5mm - 40mm	Cold-drawn or Hot-extruded; no weld seam.
Welded Pipe	ASTM A790, A928	OD: 10mm - 2000mm; WT: 2mm - 60mm	EFW, TIG, or Plasma welded; 100% X-ray tested.
Heat Exchanger Tube	ASTM A789, ASME SA789	OD: 12.7mm - 50.8mm; WT: 0.8mm - 3.5mm	High thermal conductivity; U-bend service available.
Precision/Instrumentation Tube	ASTM A789	OD: 3mm - 25.4mm; WT: 0.5mm - 2.1mm	Bright Annealed (BA); high dimensional accuracy.
Large Diameter Pipe	ASTM A928	OD up to 2500mm	Rolled from plate; used in heavy-duty desalination/oil & gas.
Matching Fittings & Flanges	ASTM A815, A182	1/2" - 48" (Sch 5S - Sch XXS)	Complete piping system components (Elbows, Tees, Flanges).

 

 

Regarding packaging and shipping, all stainless steel pipes undergo moisture-proof treatment and are securely packaged using methods such as wooden crates, pallets, or bubble wrap. For transportation, we utilize standard shipping containers or specialized transport vehicles to ensure the integrity and safety of the cargo throughout the transit process. We offer worldwide shipping; from production to final delivery, the typical lead time is 7–15 days, ensuring that orders are delivered to our customers on schedule.