difference between uns s31803 and uns s32205

What is uns S31803 material?

UNS S31803, also known as 2205 Duplex Stainless Steel or 1.4462, is a widely used duplex stainless steel combining ferrite and austenite, offering superior strength (about double that of 304/316) and excellent corrosion resistance, especially to chlorides and stress corrosion cracking, making it ideal for oil & gas, chemical processing, and marine applications.

 

What is a S32205 material equivalent to?

UNS S32205, also known as Duplex 2205, is a widely used, nitrogen-enhanced duplex (austenitic/ferritic) stainless steel offering high strength (double that of standard austenitic steels) and excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for harsh chloride environments like oil & gas, chemical processing, and marine applications, often as a replacement for 304/316 steels where more robust performance is needed.

 

Is S31803 the same as 2205?

Yes, S31803 and 2205 refer to the same core duplex stainless steel, with S31803 being the original UNS (Unified Numbering System) designation for Duplex 2205; however, a newer grade, UNS S32205, was later introduced for materials meeting the higher end of the compositional range, often offering slightly better corrosion resistance, and it can frequently be dual-certified as both S31803 and S32205.

 

difference between uns s31803 and uns s32205 Composition

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

 

difference between uns s31803 and uns s32205 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	621	448	25	31 max	293 max

 

difference between uns s31803 and uns s32205 Physical Properties

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

 

What is the difference between S31803 and S32750?

S31803 (Duplex 2205) is a standard duplex stainless steel with good corrosion resistance, while S32750 (Super Duplex 2507) is a higher-alloyed, super duplex grade with significantly enhanced pitting/crevice corrosion resistance and higher strength, achieved through greater molybdenum, chromium, and nitrogen content, making it suitable for much harsher chloride environments than S31803.  

 

What is the difference between S31803 and S32760?

S31803 (Duplex 2205) is a standard duplex stainless steel, while S32760 (Zeron 100) is a higher-alloyed super duplex grade, with the key differences being S32760's significantly higher Chromium (~25%) and Molybdenum content, providing superior resistance to pitting and crevice corrosion, along with higher strength, making it better for extremely harsh chloride or sour environments, whereas S31803 offers excellent general corrosion resistance and high strength for broader applications.

 

If you have project requirements for UNS S31803 stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: sales@gneestainless.com