ASTM A790 UNS S32205 Duplex SS Seamless Pipes
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Duplex 2205 stainless steel (both ferritic and austenitic) Seamless pipe is used extensively in applications that require good corrosion resistance and strength. The UNS S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade 2205 semless pipe offers higher resistance to corrosion.At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation, and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition; hence this grade of stainless steel is not suitable for use at these temperatures.
Chemical Composition of ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (UNS 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 (UNS 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 Composition of ASTM A790 UNS S31803 Duplex Stainless Steel Seamless Pipes
| Grade | Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness | |
| Rockwell C (HR C) | Brinell (HB) | ||||
| UNS S31803 / 2205 | 621 | 448 | 25 | 31 max | 293 max |
Physical Properties OF ASTM A790 UNS S31803 Stainless Duplex Seamless Pipes
| 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 | |||||
| UNS S31803 / 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
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