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ASME B16.9 Buttweld Pipe Fitting ASTM A815 WPS31803 Duplex Steel 90 Degree Elbow
S31803 stainless steel, also known as 2205 stainless steel, has a
dual-phase microstructure consisting of roughly equal parts of
austenite and ferrite phases. It is a popular grade of duplex
stainless steel, the unique structure contributes to its
excellent combination of mechanical strength and corrosion
resistance properties. It can be easily welded using common welding
techniques and does not require pre- or post-weld heat treatment in
most cases. While duplex stainless steel may have a higher
initial cost compared to austenitic stainless steels, the long-term
cost-effectiveness of S31803 elbows is notable due to their
extended service life and reduced maintenance requirements.
ASTM A815 Duplex Steel Pipe Fitting Specification
| Specifications | ASTM A815 / ASME SA815 |
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Grades | Duplex 2205/ S31803, S32750, S32760 |
| Size | 1/2” NB to 24″NB in |
| Type | Seamless / Welded / Fabricated |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Form | Ecc. Reducer, Con. Reducer, Red. Tee, Equal Tee, Elbow, Cap |
Equivalent Grades of ASTM A815 UNS S31803 Elbow
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex 2205 | 1.4462 / 1.4462 | S31803 / S32205 |
Chemical Composition of ASTM A815 UNS S31803 Elbow
| Cr | Ni | Mo | C | W | Cu |
|---|---|---|---|---|---|
| 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.030 Max | 0.5-1.0 | 0.50-1.0 |
N | Mn | Si | P | S | Fe |
| 0.2-0.3 | 1.00 Max | 1.0 Max | 0.03 Max | 0.01 Max | Balance |
Mechanical Properties of ASTM A815 UNS S31803 Elbow
| Tensile Strength, ksi | .2% Yield Strength, ksi | % Elongation in 50mm | Hardness Max. |
|---|---|---|---|
| 109 | 80 | 25 | 28 HRC |
Some key features of duplex steel elbows include:
Corrosion Resistance: Duplex stainless steel offers excellent corrosion resistance, especially in harsh environments with high chloride content.
High Strength: Duplex steel has higher strength compared to standard austenitic stainless steels, making it suitable for high-pressure and high-temperature applications.
Good Weldability: Duplex steel elbows can be easily welded using common welding techniques, making them versatile for various piping configurations.
Resistance to Stress Corrosion Cracking: Duplex steel is known for its resistance to stress corrosion cracking, which is a common issue in chloride-rich environments.
Versatility: Duplex steel elbows are available in different sizes, schedules, and angles to accommodate a wide range of piping systems and applications.
Cost-Effective: Despite being a premium material, duplex steel can offer cost savings over the long term due to its durability and lower maintenance requirements.
Applications
