The Alloy Steel Butt Welding End Cap is a critical pressure-containment fitting used to seal the ends of high-temperature or high-pressure piping systems. Usually designed with a hemispherical or ellipsoidal shape, it distributes internal stress evenly, providing superior strength compared to flat plates. Made from "Chrome-Moly" grades like WP11, WP22, or WP91, it resists creep and oxidation. It is essential in power plants and refineries for safely terminating steam headers and reactor lines.
Technical Attributes: Alloy Steel End Cap
Material Grades,"ASTM A234 WP5, WP9, WP11, WP22, WP91"
Design Standard,ASME B16.9 / MSS SP-75
Fitting Type,Pipe Cap (End Closure)
Shape,Ellipsoidal or Hemispherical
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)
Wall Thickness,"SCH 40, 80, 160, XXS"
Chromium Content,1.00%–9.50% (Grade dependent)
Molybdenum Content,0.44%–1.10% (Grade dependent)
Heat Treatment,Normalizing & Tempering / Annealing
Tensile Strength,415–585 MPa
Yield Strength,≥205 MPa (Higher for WP91)
Max Service Temp,Up to +650∘C (WP91)
Testing Standard,"100% UT/RT, Hydrostatic, PMI (Spectro)"
Certification,EN 10204 3.1 / MTR
Surface Finish,Anti-rust Oil / Black Paint / Varnish
Application,High-Pressure Steam / Petrochemical
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