1.446 Duplex Stainless Steel Pipe , Super Duplex Pipe Seamless Corrosion Resistance
1.4462 Duplex Stainless Steel ASTM A789 S31803 Duplex Stainless Steel Tube
Duplex 2205, also known as UNS S32205, is a nitrogen-enhanced stainless steel. Users choose Duplex 2205 for its excellent corrosion resistance along with its high strength. It is important to note that Duplex 2205, offers much higher levels of corrosion resistance than most other austenitic stainless steels. Other benefits include:
- High resistance to pitting and crevice corrosion
- Excellent in most caustic environments
- Good weldability
To be considered Duplex 2205, a stainless steel must have a chemical composition that includes:
- Cr 21-23%
- Ni 4.5-6.5%
- Mn 2% Max
- Mo 2.5-3.5%
- N 0.08-0.20%
- P 0.30% max
- C 0.030% max
The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).
Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 2205 stainless.
Specifications:
UNS S31803
ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988
SAE J405
UNS S32205
ASME SA-182 (F60), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F60), A240, A276, A479, A480, A798, A790, A815, A928, A988
SAE J405
Specifications of Duplex Stainless Steel Welded Tube
1. Standard: ASTM ASME
2. Grade: 630 / 631 / 2205 / 2507 / 17-4PH
ASTM A789, ASTM A790, ASTM A450, ASTM A530,
GB/T 14976, GB/T 14975, GB/T 13296, etc
3. OD: 8mm-1000mm
4. Wall thickness: 0.3mm-30mm
5. Length: max.18000mm or as demand
6. Surface finish: Polishing (180#,220#,240#,320#400#,600#), Hairline, acid pickled, etc.
Features
- High resistance to chloride stress corrosion cracking
- Chloride pitting and crevice corrosion resistance superior to 317L stainless
- Good general corrosion resistance
- High strength
- Good sulfide stress corrosion resistance
- Useful up to 600°F
Applications
- Chemical process vessels, piping, and heat exchangers
- FGD scrubber systems
- Pulp mill digesters, bleach washers, chip presteaming vessels
- Food process equipment
- Oil field piping, heat exchangers
Specifications:
| Specifications (ASTM/ASME) Duplex Stainless Steel Pipe | ||||
| Alloy | UNS Designation | Material Specification |
Tubing Specification |
Pipe Specification |
| 2205 | S31803/S32205 | A 240/SA-240 | A 270 | A 790/SA-790 |
| A 789/SA-789 | A928/SA928 | |||
Chemical Compositions:
| Chemical Composition (%) Duplex Stainless Steel Pipe | ||
| Alloy | 2205 | 2205 |
| UNS Designation | S31803 | S32205 |
| Carbon (C) max. | 0.030 | 0.030 |
| Manganese (Mn) max. | 2.00 | 2.00 |
| Phosphorus (P) max. | 0.030 | 0.030 |
| Sulfur (S) max. | 0.020 | 0.020 |
| Silicon (Si) max. | 1.00 | 1.00 |
| Chromium (Cr) | 21.0 - 23.0 | 22.0 - 23.0 |
| Nickel (Ni) | 4.5 - 6.5 | 4.5 - 6.5 |
| Molybdenum (Mo) | 2.5 - 3.5 | 3.0 - 3.5 |
| Nitrogen (N) | 0.08 - 0.20 | 0.14 - 0.20 |
| Iron (Fe) | Balance | Balance |
| Steel grade | 45% MgCl at 155oC | 40% CaCl2 at 100oC | 40% CaCl2 at 100oC, 0.9 x Rp0.2 | 25% NaCl, pH 1.5, 106oC | 25% NaCl, 106oC | 1500 ppm Cl- at 100oC |
| 4307 | Probable | Probable | Probable | Probable | Probable | Probable |
| 4404 | Probable | Probable | Probable | Probable | Possible | Probable |
| 2201 | Probable | Not probable | Not probable | Not probable | Not probable | Not probable |
| 2304 | Probable | Not probable | Not probable | Not probable | Not probable | Not probable |
| 2404 | Probable | Possible | Not probable | Not probable | Not probable | Not probable |
| 2205 | Probable | Not probable | Not probable | Not probable | Not probable | Possible |
| 2507 | Probable | Not probable | Not probable | Not probable | Not probable | Not probable |
| 254 SMO | Probable | Not probable | Not probable | Not probable | Not probable | Not probable |
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