S31803 vs S32205 Difference between S31803 and S32205?

S31803 almost the same with S32205 stainless steel. Mostly we use S32205 instead of S31803 in China. Below is some difference between S31803 and S32205 duplex steel according to ASTM A789.

S32205 has slightly higher minimum requirements for Cr, Mo and N, but is still within the chemical composition range of S31803. S32205 was developed to improve the potential loss of corrosion resistance and toughness in the heat affected zone of certain S31803 welds. Therefore, it is recommended that users specify the S32205 Duplex Tubes. If the use of S31803 is required, the user should require that the chemical composition of S31803 grades also meet the composition requirements of S32205 grades in order to maintain consistent performance.

S31803 vs S32205 Chemical Composition
S31803 vs S32205 Mechanical Properties
S31803 vs S32205 Physical Properties
S32205 vs S31803 Heat Treatment
S32205 vs S31803 Corrosion Resistance
S32205 vs S31803 Related Links

S31803 vs S32205 Chemical Composition

ASTM A789 ASTM A790 S32205 2205 Duplex Tubing Composition %:

C	Si	Mn	P	S	Cr	Mo	Ni	N	Cu
max. 0,03	max. 1,00	max. 2,00	max. 0,030	max. 0,020	22,00 – 23,00	3,0 – 3,5	4,5 – 6,50	0,14- 0,20	–

ASTM A789 ASTM A790 S31803 Stainless Steel Tubing Composition %:

C	Si	Mn	P	S	Cr	Mo	Ni	N	Cu
max. 0,03	max. 1,00	max. 2,00	max. 0,030	max. 0,020	21,00 – 23,00	2,5 – 3,5	4,50 – 6,50	0,08-0,20	–

S31803 vs S32205 Mechanical Properties

			Tensile Strength		Yield Strength
Alloy	UNS	Spec.	MPa	ksi	MPa	ksi	Elongation in 2 in. (min.) %	Grain Size Req.	Max. Hardness
Duplex 2205	S32205	A789, A790	655	95	485	70	25	—	290HBW, 30* HRC
Duplex S31803	S31803	A789, A790	620	90	450	65	25	—	290HBW, 30* HRC

S31803 vs S32205 Physical Properties

Alloy	UNS	Spec.	Density kg/dm³	Modulus of Elasticity (x106 psi)	Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6)	Thermal Conductivity (BTU-in/ ft2-h-°F)
Duplex 2205	S32205	A789, A790	7.8	27.5	7.6	180
Duplex S31803	S31803	A789, A790	7.8	27.5	7.6	180

S32205 vs S31803 Heat Treatment

UNS Designation	Temperature	Quenching
S31803	1870-2010 °F [1020-1100°C]	Rapid cooling in air or water
S32205	1870-2010 °F [1020-1100°C]	Rapid cooling in air or water

S32205 vs S31803 Corrosion Resistance

Both S32205 and S31803 have stress corrosion resistance properties in addition to high strength and excellent impact toughness. Provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

S31803 vs S32205 related link

General Properties
Application
Standards
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Structure
Welding
Processing
Machinability
Difference Between Duplex Steel S31803/S32205 and 316L
ASTM A789 ASME SA 789 S31803 S32205 S32101 S32750 S32760 S32304 S31500 S31260 Seamless Tubes
ASTM A790 ASME SA790 S31803 S32205 S32101 S32750 S32760 S32304 S31500 S31260 Seamless Pipe
EN 10216-5 1.4462 1.4362 1.4162 1.4410 1.4501 Seamless Tubes