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zhengzhou,China
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1/2" - 60" Carbon Steel Pipe Flanges Astm A105 Forging Backing Ring high
Black Color RF WN Flange High Strength 900# ASME B16.47 SER.B ASTM A105
WN Carbon Steel Flange RF 900# 26"- 48" ASME B16.47 SER.B ASTM A105 For Energy
Chemical Industry Carbon Steel Forged Flanges Smooth Surface 2500# 1/2" - 24"