Duplex 2205 stainless steel strip coil with good corrosion
resistance
Duplex 2205 stainless steel (both ferritic and austenitic) is used
extensively in applications that require good corrosion resistance
and strength. The S31803 grade stainless steel has undergone a
number of modifications resulting in UNS S32205, and was endorsed
in the year 1996. This grade 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.
Product Description:
- Item: Stainless steel coil, 201 ss coil, 202 ss coil, 304L ss coil,
440 ss coil
- Standard: AISI, ASTM, EN, JIS, DIN, GB
- Thickness: 0.17-2.0mm or up (cold rolled); 2.5-6mm(hot rolled)
- Width: 28-620mm(cold rolled); 405-620mm(hot rolled)
- Quality: NO. 1
- Surface: Black/Polished/Bright, no. 4, 2b, ba or as requsest
- Shipment: Within 15-20 working days after receipt of the down
payment or Irrevocable L/C sight.
- Certificate: ISO, SGS, and third part inspection.
- Capacity: 500 metric tons per month.
- Payment: By L/C at sight, 100% by TT.
Duplex Stainless Steels:
Duplex stainless steel have high chromium and low nickel contents.
This gives duplex stainless steel microstructures that include both
austenitic and ferritic phases. They include alloys like 2304 and
2205. These alloys are so named due to their respective
compositions - 23% chromium, 4% nickel and 22% chromium, 5% nickel.
By having both austenite and ferrite in the microstructure, duplex
stainless steel feature properties of both classes. Although a
compromise between the two ‘pure’ types, duplex grades can offer
some unique property solutions. Duplex grades are resistant to
stress corrosion cracking, but not to the same level as ferritic
grades. The toughness of duplex grades is superior to that of the
ferritic grades – but inferior to that of the austenitic grades.
Most importantly, the corrosion resistance of duplex steels is
equal, or superior to 304 and 316 stainless steel. This is
particularly so for chloride attack.
Duplex grades are readily welded. They also have high tensile
strengths.
Duplex Stainless Applications:
Duplex stainless steel typically find application in areas like:
- Heat exchangers
- Marine applications
- Desalination plants
- Food pickling plants
- Off-shore oil & gas installations
- Chemical & petrochemical plant
Chemical Composition:
| 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 |
Physical Properties:
| 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 |
Difference:
Facing process | feature and application |
NO. 1 | Hot rolled, annealing, pickling. Usually used to cold rolled
material, pot for industry, device for the chemical industry and so
on. |
NO. 2B | Almost satisfy for cold - rolled and stainless steel ' s
applications, such as Kitchen products, surface finish, furniture
and sufficient. |
BA | Cold rolled, bright annealing, Flat, smooth and excellent
horizontal installation
, have high albedo. Used for Construction, household electrical
appliances and equipment for the kitchen And so on. |
matte side | NO. 2B surface is rolled made from dull roll, have loftex surface.
Used for Construction decorated, elevator decorated. |
Product Photos:
