The ASME B16.9 SCH40 Stub End is a critical component used in conjunction with a Lap Joint Flange to facilitate easy pipeline disassembly and alignment. Forged from high-grade stainless or carbon steel, it features a "Lap" (flare) that acts as the sealing surface, while the butt-welding end integrates permanently with the pipe. The SCH40 wall ensures a balance of pressure rating and flow efficiency. This design is essential for systems requiring frequent cleaning or in high-cost alloy piping to reduce flange material costs.
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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