In this article, experts from Mirach Metallurgy Co.,Limited share the detail info of duplex stainless steel. If you are looking for duplex stainless steel and its related products, see its feature below first.
Key Properties
These properties are specified for flat rolled product (plate, sheet and coil) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications.
Composition
Typical compositional ranges for grade 2205 stainless steels are given in table 1.
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
Typical mechanical properties for grade 2205 stainless steels are given in table 2.
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
|
620
|
450
|
25
|
31 max
|
293 max
|
| Note: Mechanical property requirements for S31803 and S32205 are identical. |
Physical Properties
Typical physical properties for grade 2205 stainless steels are given in table 3.
Table 3. Typical annealed condition physical properties for 2205 grade stainless steels
|
Grade
|
Density
(kg/m3)
|
Elastic
Modulus
(GPa)
|
Mean Co-eff of Thermal
Expansion (mm/m/°C)
|
Thermal
Conductivity (W/m.K)
|
Specific
Heat
0-100°C
( J/kg.K)
|
Electrical
Resistivity
(nW.m)
|
|
0-100°C
|
0-315°C
|
0-538°C
|
at 100°C
|
at 500°C
|
|
2205
|
7805
|
200
|
13.7
|
14.7
|
–
|
19
|
–
|
450
|
850
|
| Note: Physical properties of S31803 and S32205 are identical. |
Grade Specification Comparison
Approximate grade comparisons for 2205 stainless steels are given in table 4.
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
|
| Note: These comparisons are approximate only. The list is intended as a comparison of functionally similar materialsnot as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. |
Possible Alternative Grades
Possible alternative grades to grade 2205 stainless steels are given in table 5.
Table 5. Grade specification comparisons for 2205 grade stainless steels
| Grade |
Why it might be chosen instead of 2205 |
| 904L |
Better formability is needed, with similar corrosion resistance and lower strength. |
| UR52N+ |
High resistance to corrosion is required, eg 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. |
|
