TOBO STEEL GROUP CHINA
| PREN | 34 or above |
| Payment Terms | T/T,L/C at sight,D/P at sight |
| Application | Seawater Desalination and Reverse Osmosis Train |
| Schedule | SCH40S |
| End Connection | Beveled End |
| Material Grade | Duplex 2205, UNS S31803 / S32205 |
| Wall Thickness | 9.27 mm SCH40S |
| Packaging Details | Plywood case with waterproof paper, steel strip and sea worthy export packing |
| Standard | ASME B16.9, ASTM A815 |
| product name | Duplex 2205 Desalination Concentric Reducer |
| Supply Ability | 800 Tons per Month |
| Size | DN250 x DN200 |
| Delivery Time | 7-10 days for stock sizes, 20-25 days for production |
| Ferrite Content | 40 to 60 percent |
| Certification | ISO 9001:2015, PED 2014/68/EU, EN 10204 3.1 |
| Model Number | DSR-RD-2205-DN250 |
| Place of Origin | Cangzhou, Hebei, China |
| Brand Name | HENGYU |
View Detail Information
Explore similar products
Pipe Fitting Stainless Steel Concentric Reducer WPB SS Fittings Size 1-96 Inch
BW Stainless Steel Eccentric Reducer DN 500X600 A403-WP304L 316L 321 ASTM B16.9
SS Reducer ECC / CON ASME SA-815 WP UNS S32760 Zeron 100 Super Duplex Fitting
Pipe Fitting Reducer CON Reducer SS904L UNS S32750 UNS S32760 310S 317L 321
Product Specification
| PREN | 34 or above | Payment Terms | T/T,L/C at sight,D/P at sight |
| Application | Seawater Desalination and Reverse Osmosis Train | Schedule | SCH40S |
| End Connection | Beveled End | Material Grade | Duplex 2205, UNS S31803 / S32205 |
| Wall Thickness | 9.27 mm SCH40S | Packaging Details | Plywood case with waterproof paper, steel strip and sea worthy export packing |
| Standard | ASME B16.9, ASTM A815 | product name | Duplex 2205 Desalination Concentric Reducer |
| Supply Ability | 800 Tons per Month | Size | DN250 x DN200 |
| Delivery Time | 7-10 days for stock sizes, 20-25 days for production | Ferrite Content | 40 to 60 percent |
| Certification | ISO 9001:2015, PED 2014/68/EU, EN 10204 3.1 | Model Number | DSR-RD-2205-DN250 |
| Place of Origin | Cangzhou, Hebei, China | Brand Name | HENGYU |
| High Light | Duplex 2205 Concentric Reducer ，Seawater Desalination Reducer ，UNS S31803 Pipe Reducer | ||
Seawater desalination trains expose every concentric reducer to chlorides at ambient temperature — precisely the condition where 316L pits and duplex 2205 does not. This concentric reducer is produced from UNS S31803 / S32205 plate with a PREN above 34, solution annealed and water quenched to hold a balanced ferrite and austenite structure.
In a reverse osmosis train, the concentric reducer sits between the high-pressure pump discharge and the membrane rack header, where velocity is high and turbulence at the size change accelerates pitting. Because duplex 2205 has roughly twice the yield strength of 316L, the same DN250 x DN200 concentric reducer can be supplied in a thinner wall without losing pressure capability, which reduces weight on the rack.
| Material | Duplex 2205, UNS S31803 / S32205 |
|---|---|
| PREN | 34 or above, checked per heat |
| Size | DN250 x DN200, 10 Inch x 8 Inch |
| Schedule | SCH40S, SCH10S available |
| Yield Strength | 450 MPa minimum |
| Ferrite Content | 40 to 60 percent after solution annealing |
| Standard | ASME B16.9, ASTM A815 |
| Corrosion Test | ASTM G48 Method A, pitting resistance |
| Ends | Beveled End, pickled and passivated |
A: 316L is prone to pitting in chloride-containing seawater, particularly at welds and at flow disturbances such as a size change. Duplex 2205 with PREN above 34 resists that mechanism and also carries a much higher yield strength.
A: Yes. The concentric reducer handles brine discharge, which is more aggressive than feed seawater because of the higher chloride concentration, and duplex 2205 is the usual minimum grade for that section of a desalination plant.
A: Between 40 and 60 percent, measured by magnetic or metallographic method. Outside that range, either toughness or corrosion resistance starts to fall.
A: Yes. The same concentric reducer can be produced in S32750 and S32760 for higher temperature or higher chloride duty, with PREN above 40.
A: No. Duplex 2205 is welded without PWHT. The heat input should be controlled and the weld cap pickled afterwards to restore the passive film.
Share the water chemistry, temperature and pressure class, and we will confirm whether duplex 2205 or super duplex is required for the concentric reducer in your desalination package.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
Get in touch with us
Leave a Message, we will call you back quickly!