The designation "Gr.WPB" in ASTM A234 Carbon Steel Gr.WPB Elbow refers to the specific grade of carbon steel being used. In this case, "WPB" stands for "Wrought Pipe Fitting Buttweld," which indicates that the fittings are designed for butt welding. WPB is one of the most common grades specified in ASTM A234 and represents a standard-grade carbon steel suitable for various industrial applications.
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