ASTM S31803 S32205 1.4462 Duplex Steel Round Bar Forged Black Rod
OD 80mm
The 2205 grade steel is one of the most widely used ferritic and
austenitic duplex stainless steel. The standard of this grade of
steel has been refined over the years creating a versatile and
strong product. It is has an excellent corrosion resistance
(including in seawater), it is weldable by all standard methods,
and has a high heat resistance.
Duplex 2205 Stainless Steel Bar
UNS S31803/UNS S32205
UNS S31803 and UNS S32205 are commonly referred to as Duplex 2205®
material, whose “Duplex” name is derived from the mixed
microstructure which contains about equal portions of ferrite and
austenite. Developed more than 70 years ago in Sweden precisely for
the sulfite paper industry where the Duplex’s were used to combat
corrosion problems caused by chloride-bearing cooling waters and
other aggressive chemical products. Since then there have been
advancements in the composition such as the deliberate addition of
nitrogen as an alloying agent, which afterwards quickly made Duplex
the “workhorse” of stainless steels.
Generally, UNS S31803 has been solely designated to the Duplex
2205® grade. More recently, it has been available complying with
the higher corrosion resistant composition UNS S32205. The only
difference in the UNS numbers is that UNS S32205 contains a higher
nitrogen content which guarantees better corrosion resistance.
Composed of between 21% to 23% chromium, 4.5% to 6.5% nickel, 5% to
3.5% molybdenum, 2% manganese, and 1% silicon, with the balance
being iron. Also found in Duplex Stainless Steel are trace amounts
of carbon, phosphorus, sulfur and nitrogen.
Benefits of Duplex include: good weldability and workability, high
resistance to corrosion fatigue, stress corrosion cracking
(especially chloride stress corrosion cracking), erosion, and high
energy absorption. Other advantages of Duplex are higher heat
conductivity and low thermal expansion compared to austenitic
stainless steels, high strength, good resistance to sulfide stress
corrosion, and high resistance to pitting and crevice to corrosion.
Duplex 2205® accounts for over 80% of the total usage of Duplex
stainless steels throughout the world because of its superior
workability as well as corrosion resistance.
Industries that use Duplex include:
- Chemical
- Desalination
- Material handling
- Oil and Gas extraction
- Pulp and Paper
- Petrochemical
Products partially or completely constructed of Duplex include:
- Augers
- Cargo tanks
- Couplings
- Diaphragm seals
- Fans
- Fasteners
- Heat exchangers
- Hubs
- Instrumentation tubes
- Pipe fittings
- Press rolls
- Pressure vessels
- Rotors
- Screw conveyors
- Shafts
- Valve parts
| STOCKING DIAMETERS | 1/2” TO 14” |
|---|
| MATERIAL LENGTHS | UP TO 24’ |
|---|
BAR SPECIFICATIONS| UNS | TYPE | AMS | ASTM | FEDERAL | CHARACTERISTICS |
|---|
| S31803/S32205 | Duplex | –
– | A-276
A-479 | – | Roughly double the strength of standard austenitic stainless
steels, designed to improve resistance in many applications such as
chloride environments and sulfide stress corrosion. |
CHEMISTRY ANALYSIS| C | MN | P | S | SI | CR | NI | MO | CU | OTHER | M/NM |
|---|
| .03 | 2. | .03 | .02 | 1. | 21. – 23. | 4.5 – 6.5 | 2.5 – 3.5 | | N .08 – .2 | INQUIRE
|
Common Trade names
2205 Stainless, 2205 Stainless Steel
Features
- Corrosion Resistance: 2205 stainless stands-up excellently in a
range of atmospheric environments even when exposed to corrosive
elements, specifically to sea water.
- Heat Resistance: Generally, 2205 is not suitable for use at
temperatures above 300°C as it suffers from precipitation of
brittle micro-constituents.
- Avoid temperatures below -50°C because of its
ductile-to-brittle-transition.
- Easy to weld with excellent weldability.
- The high strength of 2205 also makes bending and forming more
difficult.
Applications
Applications can be used in chemical processing, transport, and
storage for a variety of industries due to both its excellent
corrosion resistance and high strength.
