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PN250 Class1500 WN RTJDN100 NPS4" DN150 NPS6" DN300 NPS 12"A350 LF3 Carbon Steel Flange Forgings Q + T Heat Treatment ASTM/ASME Standard A350 LF2(%) C≤0.20 Si:0.25~0.35 Mn:≤0.90 S≤0.035 P≤0.040 Cu≤0...