The ASTM A234 Alloy Steel Seamless Equal Tees (Grades WP5, WP9, WP11, WP22, WP91) are high-performance branch fittings for extreme heat and pressure. Containing varying levels of Chromium and Molybdenum, these "Chrome-Moly" fittings resist creep and oxidation. The Seamless construction ensures zero weld-seam risk, while the Equal design maintains constant flow diameter. They are critical for power plant headers, steam lines, and refinery reactors operating up to 650℃
Technical Attributes: ASTM A234 Seamless Equal Tee
Common Grades,"WP5, WP9, WP11, WP22, WP91"
Material Class,Wrought Alloy Steel (Chrome-Moly)
Manufacturing,Seamless (Hot Forged / Cold Drawn)
Standard,ASME B16.9 / MSS SP-75
Type,Equal Tee (Run Diameter = Branch Diameter)
Size Range,1/2" to 24" (Seamless Limit)
Wall Thickness,"SCH 40, 80, 160, XXS"
WP5 Content,5% Cr–0.5% Mo
WP11 Content,1.25% Cr–0.5% Mo
WP22 Content,2.25% Cr–1% Mo
WP91 Content,"9% Cr–1% Mo+ V, Nb, N"
End Connection,Butt Welding (BW)
End Preparation,Beveled Ends per ASME B16.25
Tensile Strength,415–585 MPa (Grade Dependent)
Heat Treatment,Normalizing & Tempering / Annealing
Hardness,≤197 HBW (WP91 up to 248 HBW)
Testing,"Hydrostatic, UT, MT, Spectro (PMI)"
Certification,EN 10204 3.1 / MTR
Application,High-Pressure Steam / Petrochemical
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