The ASTM A234 Alloy Steel Reducer (Grades WP5–WP91) is a high-performance "Chrome-Moly" fitting designed for extreme temperature and pressure. Available in Concentric and Eccentric types, these reducers offer superior creep resistance and oxidation protection. They are essential in power plants and refineries for transitioning pipe sizes in high-pressure steam and catalytic cracker lines, where standard carbon steel would fail due to thermal degradation or hydrogen attack.
Technical Attributes: ASTM A234 Alloy Steel Reducer
Common Grades,"WP5, WP9, WP11, WP22, WP91"
Material Class,Wrought Alloy Steel (Cr-Mo)
Fitting Type,Concentric (CR) or Eccentric (ER)
Design Standard,ASME B16.9 / MSS SP-75
Manufacturing,Seamless or Welded (W)
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"
WP11 Content,1.25% Cr–0.5% Mo
WP22 Content,2.25% Cr–1.0% Mo
WP91 Content,"9.0% Cr–1.0% Mo+V, Nb, N"
Tensile Strength,415–585 MPa (Grade Dependent)
Heat Treatment,Normalizing & Tempering / Annealing
Max Service Temp,Up to +650∘C (Specifically WP91)
Hardness,≤197 HBW (WP91 up to 248 HBW)
Testing Standard,"Hydrostatic, UT, MT, Spectro (PMI)"
Certification,EN 10204 3.1 / MTR
Primary Markets,Power Generation / Petrochemical Refining
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