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Paul Tube Fittings is a reliable producer and distributor of top-grade Duplex Steel Hydraulic Fittings located in Houston, USA. Driven by excellence, Paul Tube Fittings provides precision-crafted components for challenging industrial applications. Our Duplex Steel Hydraulic Fittings are recognized for their extraordinary strength, resistance to corrosion, and extended period of service. We serve industries such as oil & gas, chemical, marine, and construction with dependable hydraulic solutions that match individual operational requirements. By using the latest manufacturing methods and rigorous quality checks, Paul Tube Fittings delivers customer satisfaction and industry standards at all levels.
Duplex Steel Hydraulic Fittings consist mainly of chromium (22–25%), nickel (4.5–7%), molybdenum (2–3.5%), and nitrogen, providing a balanced dual-phase microstructure of austenite and ferrite. This structure provides superior corrosion resistance in chloride and acid environments. They have very high yield strength (normally 450–620 MPa) and tensile strength (600–800 MPa) with good impact and fatigue resistance. The fittings are also stable at high pressure and temperature conditions and are best suited for hydraulic systems requiring durability, reliability, and resistance to stress corrosion cracking and pitting.
| DESIGN STANDARD | DIN 2353/ ISO 8434-1 |
| MATERIAL | DUPLEX 2205 |
| SERIES | LL- LOW PRESSURE , L- MEDIUM PRESSURE, S- HIGH PRESSURE |
| WORKING PRESSURE | 1 BAR TO 700 BAR |
| SIZE RANGE | 6 MM TO 42 MM |
| CONNECTIONS | TUBE TO TUBE , TUBE TO MALE THREAD , TUBE TO FEMALE THREAD , TUBE TO BUTT WELD , TUBE TO SOCKET WELD , TUBE TO JIC 37* , TUBE TO 24* CONE, TUBE TO SWIVEL END , TUBE TO ADJUSTBALE STANDPIPE |
| WELD NIPPLE TO MALE THREAD , WELD NIPPLE TO FEMALE THREAD , WELD NIPPLE TO BUTT WELD , WELD NIPPLE TO SOCKET WELD , WELD NIPPLE TO 24* CONE , WELD NIPPLE TO 37* JIC , WELD NIPPLE TO SWIVEL | |
| BODY TYPE | FORGED, BAR STOCK |
| SURFACE | EXPORT BRIGHT FINISH, SHORT BLASTED FINISH, ELECTROPLATED FINISH |
ELEMENT | DUPLEX 2205 | DUPLEX 31803 |
|---|---|---|
NI | 4.50 – 6.50 | 4.50 – 6.50 |
C | 0.030 max | 0.030 max |
MN | 2.00 max | 2.00 max |
P | 0.030 max | 0.030 max |
S | 0.20 max | 0.020 max |
SI | 1.00 max | 1.00 max |
CR | 21.0 – 23.0 | 22.0 – 23.0 |
MO | 2.50 – 3.50 | 3.0 – 3.5 |
N | 0.08 – 0.20 | 0.14 – 0.20 |
FE | 63.54 min | 63.72 min |
| Grade | YS (MPa) | UTS (MPa) | % Elongation | Hardness(BHN) |
| 31803 | 450 min. | 620 min. | 25 min. | 293 max. |
| 2205 | 450 min. | 655 min. | 25 min. | 293 max. |
| Density (Kg.m-1) | 7810 |
| Magnetic Permeability | <50 |
| Young’s Modulus (N/mm2) | 190 x 10^3 |
| Specific Heat, 20°C (J.Kg-1.°K-1) | 400 |
| Specific Electrical Resistance, 20°C (µO.m) | 0.85 |
| Thermal conductivity, 20°C | 15 |
| Mean coefficient of thermal expansion | 11 x 10^-6 |
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
| Duplex 2205 Plate | 1.4462 / 1.4462 | UNS S31803 / UNS S32205 |
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Duplex Steel Hydraulic Fittings find wide application in high mechanical strength and high corrosion resistance demanding applications. Some of the typical industries where they are utilized are offshore and onshore oil and gas production, petrochemical processing plants, chemical plants, marine applications, and pulp & paper mills. They are best suited in high-pressure hydraulic systems, flow control arrangements, and instrumentation lines where failure cannot be afforded. Their capacity to survive hostile conditions and corrosive chemicals qualifies them for subsea gear, desalination plants, and chemical storage facilities. Duplex fittings are also employed in heat exchangers, pressure vessels, and structural piping systems where safety and durability are paramount.
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