Stainless Steel Grade 2205 - Duplex High Strength Grade

 

Composition

Table 1 provides the compositional ranges for grade 2205 duplex stainless steel.

Table 1 - 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

The typical mechanical properties of grade 2205 stainless steels are listed in the table below. Grade S31803 has similar mechanical properties to that of S32205.

Table 2 - 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

The physical properties of grade 2205 stainless steels are tabulated below. Grade S31803 has similar physical properties to that of S32205.

Table 3 – 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 Comparison

Table 4 provides the grade comparison for 2205 stainless steels. The values are a comparison of functionally similar materials. Exact equivalents may be obtained from the original specifications.

Table 4 - 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

Possible Alternative Grades

Given below is a list of possible alternative grades, which may be chosen in place of 2205.

Table 5 - 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.