ASTM A403 WP321 Stainless Steel 180° Elbow , ASME B16.9 Buttweld Pipe Fitting
ASTM A403 / ASME SA403 WP321 Steel 180 Degree Elbow, Stainless Steel Buttweld Pipe Fitting
The elbow fitting allows for changes in direction of the piping system, typically at angles of 45 degrees, 90 degrees or 180 degree. Stainless steel 321 is primarily composed of chromium (Cr), nickel (Ni), and titanium (Ti). The addition of titanium enhances the material's resistance to intergranular corrosion. This grade is known for excellent resistance to oxidation and many corrosive environments, particularly at elevated temperatures. Suitable for applications in temperatures up to around 900°F (480°C) depending on the specific conditions.
Material Equivalent of ASTM A403 WP321/321H Stainless Steel BW Elbow
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Chemical Equation of ASTM A403 WP321/321H Stainless Steel BW Elbow
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 5(C+N) - 0.70 max |
| SS 321H | 0.04 - 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 4(C+N) - 0.70 max |
Mechanical Characteristics of ASTM A403 WP321/321H Stainless Steel BW Elbow
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi - 75000 , MPa - 515 | Psi - 30000 , MPa - 205 | 35 % |
Butt Weld Elbow (45°)
A 45-degree buttweld elbow is used to change the direction of a piping system by 45 degrees. It allows for a gradual turn in the flow, which can be beneficial for reducing pressure loss and turbulence.
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Butt Weld Elbow (90°)
A 90-degree buttweld elbow changes the direction of the pipe flow by a right angle (90 degrees). This is the most common type of elbow used in piping systems. Available in different radii (short radius or long radius), which affects the flow rate and pressure drop.
Butt Weld Elbow (180°)
A 180-degree buttweld elbow creates a U-bend in the piping system, reversing the flow direction completely. It effectively allows for full redirection in the piping layout. Commonly used in applications where a return flow is necessary, such as in cooling systems and certain hydraulic applications.
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Application
- Chemical and Petrochemical Industries: Used in piping systems where high strength and resistance to corrosion are required.
- Power Generation: Often utilized in heat exchangers, steam lines, and other components under high temperature and pressure.
- Food Processing: Common in sanitary applications due to its cleanliness and resistance to corrosion.
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