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Spezilla Tube Co., Ltd. (Shanghai) |
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Cold Rolled duplex stainless steel 2205 Tubing Stress Corrosion For Heat Exchanger
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.
2205 is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength. The standard duplex S31803 composition has over the years been refined by many steel suppliers, and the resulting restricted composition range was endorsed as UNS S32205.Duplex S32205 gives better guaranteed corrosion resistance, but for much of the Duplex S31803 currently produced also complies with Duplex S32205. 2205 is not generally suitable for use at temperatures above 300ºC as it suffers from precipitation of brittle micro constituents, nor below -50ºC because of its ductile-to-brittle-transition.
Duplex Stainless Steel Tubing has a chemical composition of approximately equal parts of austenite and ferrite which is why it has twice the design strength of normal austenitic and ferritic stainless steel tubing. Duplex stainless steel tubings have a wide range of corrosion resistance levels. They also have high resistance to stress corrosion cracking that they might have received from its ferritic side. Duplex stainless steels are still very much in their developing stages and there are constantly different brands being promoted, this should continue till an accomplished and proven grade emerges. Duplex stainless steel tubes are used by a number of companies across the globe because they are very cost effective.
| Item | Description | |
| Basic Information | Material Grade | TP304 , TP304L , TP304H , TP316 , TP316L , TP316Ti , TP309S , TP310S , TP321 , TP321H , TP347 , TP347H , S31803 , S32750 , S32205 etc |
| Outer Diameter | 1/4"-4" | |
| Wall Thickness | BWG20-BWG10 | |
| Length | Can be Produced as per customer’s requirement | |
| Standard | ASTM A213 ; ASTM A269 ; ASTM A312 ; ASTM A789 ; ASTM A790 ect . | |
| Process Method | Cold Drawn or Cold Rolled | |
This specification covers Seamless austenitic stainless steel tubing intended for high temperature usage such as boiler, superheater, heat exchanger, or condenser tubes.
SeaWorthy Polywooden Cases/In Bundle
Boilers, heat exchanger, heaters or condensers.
Package
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 |
