china astm a182 alloy steel weld neck flange supplier: astm a182f11, f22 weld neck flanges, 900lb, pn150, gost 12821, gost 12822,1/2-24 inch, dn15-dn600.
materials: astm a182, alloy steel.
grades: f11, f22.
standards: gost 12821, gost 12822.
pressure: 900lb (pn150).
sizes: 1/2-24 inch (dn15-dn600).
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