| Type | Seamless & Welded Pipe | Butt Weld Fittings | Flanges & Pressure Fittings |
| Sizes | 1/4″ thru 16″ | 1/2″ thru 12″ | All descriptions |
| Schedules | Sch 10, 40, 80, 160 & XXH | Sch 10, 40, 80, 160, & XXH |
ASTM Standards
| Bar | Butt Weld Fittings | Forgings | Pipe, Welded & Seamless | Tube, Welded | Plate |
| A276, A479 | A815 | A182 | A790 | A789 | A240 |
Minimum Physical Properties
| Tensile Strength | Yield Strength |
| 90 KSI Min. | 65 KSI Min. |
Chemical Composition (wt%)
| C | Mn | P | S | Si | Ni | Cr | Fe | Mo | N |
| 0.03 Max | 2.00 Max | 0.03 Max. | 0.02 Max. | 1.00 Max. | 4.50 – 6.50 | 21.0 – 23.0 | Balance | 2.50 – 3.50 | 0.14 – 0.20 |
Properties
Duplex 2205 is a dual-phase stainless steel whose grain structure is about 45% ferritic and 55% austenitic, hence the name “duplex”. With twice the mechanical strength and corrosion resistance of common austenitics, 2205 offers some advantages over 316L and 317L:
* Lower coefficient of thermal expansion and a higher thermal conductivity
* Resists chloride stress corrosion cracking
* Pitting and crevice corrosion resistance
* Excellent choice for high chloride environments
* Lower cost than high alloyed austenitics
Applications
Industries taking advantage of the lower cost and higher mechanical properties of 2205 include:
* Heat exchangers
* Marine construction
* Oil and gas industry
* Chemical processing
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