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A234 WPB steel Concentric reducer 1.Size:1/2"-48",DN15-DN1200 2.Material:Carbon steel: ASTM/ASME A234 WPB-WPC, ST37.2. Alloy steel:ST52, 15CrMo,WP 1-WP 12 ,WP 11-WP 22 ,WP 5-WP 91 Stainless steel: ...