2205 Duplex Stainless Steel Pipe: Density, Physical Properties

If you are sourcing high-strength, corrosion-resistant stainless steel pipes for demanding environments, 2205 duplex stainless steel pipe is one of the most widely specified materials in modern projects. Known for its balanced duplex microstructure, 2205 combines the corrosion resistance of austenitic stainless steel with the strength of ferritic steel-making it a cost-effective solution for pressure piping, marine systems, and chemical processing.
 

What Is 2205 Duplex Stainless Steel pipe?

2205 duplex stainless steel corresponds to UNS S31803 / UNS S32205, featuring a 50% ferrite + 50% austenite microstructure. This structure delivers higher mechanical strength and improved resistance to chloride stress corrosion cracking compared to 304 and 316 stainless steel pipes.Common standards include ASTM A790 / ASME SA790 for seamless and welded duplex stainless steel pipes.

 

Composition ranges for 2205 grade stainless steels

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

 

Mechanical properties of 2205 grade stainless steels

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

 

Physical properties of 2205 grade stainless steels

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (μm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C ( J/kg.K)	Electrical Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
2205	7800	190	13.7	14.2	-	19	-	418	850

 

Grade specification comparisons for 2205 grade stainless steels

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

 

What is the density of 2205 duplex stainless steel pipe?

2205 duplex stainless steel pipe has a density of approximately 7.8 g/cm³ (7800 kg/m³ or 0.282 lb/in³), and is a high-strength, corrosion-resistant material suitable for chemical and marine applications.

 

Grade specification comparisons for 2205 grade stainless steels

Grade	Reasons for choosing the grade
904L	Better formability is needed, with similar corrosion resistance and lower strength.
UR52N+	High resistance to corrosion is required, e.g. resistance to higher temperature seawater.
6%Mo	Higher corrosion resistance is required, but with lower strength and better formability.
316L	The high corrosion resistance and strength of 2205 are not needed. 316L is lower cost.

 

Procurement Insights ： How to Buy 2205 Duplex Pipes Efficiently?

When purchasing 2205 duplex stainless steel pipe, buyers should confirm:

Grade: S31803 or S32205

Manufacturing type: Seamless or welded

Size, wall thickness, and schedule

Standard: ASTM A790 / ASME SA790

Certification: EN 10204 3.1 / 3.2, third-party inspection if required

Surface condition and delivery time

 

Please fill out the material requirements form.

If you have project requirements for 2205 stainless steel pipes, we welcome your order. GNEE has a large inventory of popular products for you to choose from. Available in both seamless and welded forms, please contact our factory immediately for detailed chemical composition information and free samples. We offer competitive prices and excellent service.
The pipes are packaged with waterproof paper and steel strips, meeting standard export sea freight packaging requirements, suitable for various transportation methods, or customized according to customer requirements.