求购法兰 1. 法兰 dn 450, 数量: 800 件. 尺寸 od-620 x id-478, pcd: 555, 厚度: 20 mm. 2. flange dn 500, q'ty: 500 pcs size od-720 x id-520, pcd: 645, thickness: 20 mm.
3. flange dn 650, q'ty: 300 pcs, size od- 845 x id- 664, pcd: 780, thickness: 22 mm
