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ASTM A403 WP317-S Stainless Steel Equal Tee for Petrochemical, Buttweld Fittings ANSI B16.9
ASTM A403 is the specification for Wrought Austenitic Stainless Steel Piping Fittings. This specification covers wrought stainless steel fittings for pressure piping applications. Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.
The ASTM A403 WP317-S Stainless Steel Equal Tee is a high-performance, seamless or welded butt-welding pipe fitting designed for critical piping systems. Manufactured from grade WP317-S (a molybdenum-bearing austenitic stainless steel with enhanced carbon content for high-temperature strength), it meets the material specifications of ASTM A403 and the dimensional standards of ANSI/ASME B16.9. As an "Equal Tee," it features three connection ends of identical diameter, facilitating a 90-degree branch from a main pipeline. Its primary design purpose is to provide superior resistance to pitting, crevice corrosion, and stress-corrosion cracking in aggressive chloride-containing environments, making it a cornerstone component for demanding applications in petrochemical, chemical processing, offshore, and high-temperature service industries.
|
Grade WPA
|
Grade CRA
|
UNS Designation
|
TypeB |
|
WP317
|
CR317 |
S31700 |
317 |
1.Chemical & Mechanical Properties
| ASTM A403 WP317-S Chemical Composition (%) |
| C |
Mn |
Si |
P |
S |
Cr |
Ni |
Mo |
| ≤0.08% |
≤2.00% |
≤1.00% |
≤0.045%
|
≤0.030% |
18.0%-20.0% |
11.0%-15.0% |
3.0%-4.0% |
Mechanical Properties
| Property |
Standard |
| Tensile Strength |
≥515 MPa |
| Yield Strength (0.2% offset) |
≥205 MPa |
| Elongation |
≥28% |
|
Solution Anneal Temperature
|
1040℃/1900℉
|
|
|
water or other rapid cool
|
2. Key Adventages
The WP317-S material, with a higher Molybdenum content (typically ≥ 3.0%), offers significantly better resistance to pitting and crevice corrosion in chloride environments (e.g., seawater, chemical media) compared to standard 316/316L grades, making it ideal for demanding petrochemical and offshore applications.
Seamless, indicating the tee is formed from a single piece without a longitudinal weld seam. This eliminates the potential weak points and defects associated with welding, delivering the highest structural integrity and safety for high-pressure, critical service systems like petrochemical plants.
The material exhibits superior resistance to sensitization and carbide precipitation under prolonged high-temperature service. This effectively slows the degradation of material properties over time and mitigates the risk of sudden failure due to increased susceptibility to intergranular corrosion, making it especially suitable for long-term, continuous process plants.
Production in accordance with ASTM A403 ensures that the entire process—from raw material melting and forging/fabrication to final heat treatment—is under strict quality control. Full material test reports (CMTRs) can be provided for each batch, guaranteeing complete traceability of chemical composition and mechanical properties. This fulfills the mandatory documentation requirements of high-end projects and industry specifications.
3. Key Applications
- Marine Engineering & Seawater Handling
-
Petrochemical & Chemical Processing
-
Energy & Power Generation
-
Pulp & Paper Industry
-
High-Demand Infrastructure & Special Applications (including nuclear power plant auxiliary systems, liquefied natural gas (LNG) processing equipment, high-grade food & pharmaceutical plants (requiring high cleanliness and corrosion resistance)
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