The ASME B16.9 Stainless Steel SCH80 Butt Welding Cap is a high-pressure end closure designed to permanently seal a pipeline. Forged from corrosion-resistant grades like 316L or 304L, its ellipsoidal shape ensures uniform stress distribution, preventing fatigue under heavy loads. The SCH80 (Heavy Wall) thickness makes it ideal for high-pressure chemical processing, offshore oil rigs, and power plants. Its butt-weld design provides a leak-proof, compact termination that is significantly more robust than threaded or flanged alternatives.
Technical Attributes: Stainless Steel SCH80 Cap
Standard,ASME B16.9 / ANSI B16.9
Material Grades,"ASTM A403 WP304/L, WP316/L, WP321, WP347"
Fitting Type,Pipe Cap (End Closure)
Wall Thickness,SCH 80 / SCH 80S (Heavy Wall)
Manufacturing,Seamless / Hot Forged / Cold Pressed
End Connection,Butt Welding (BW)
End Preparation,Beveled Ends per ASME B16.25
Size Range,1/2" to 48" (DN15 - DN1200)
Shape,Ellipsoidal (2:1 Ratio) or Hemispherical
Chromium Content,16.0%–20.0%
Nickel Content,8.0%–14.0%
Heat Treatment,Solution Annealing & Rapid Quench
Tensile Strength,≥485 MPa (70 ksi)
Yield Strength,≥170–205 MPa
Testing Standard,"PMI, Radiographic, Hydrostatic, UT"
Surface Finish,"Pickled, Passivated, or Bead Blasted"
Hardness,≤187 HBW
Certification,EN 10204 3.1 / MTR
Applications,"High-Pressure Gas, Chemical, & Marine"
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