... do special design ProductFlange ,Steel flange,Carbon steel, threaded flangeSize15mm~600mmMaterialCarbon steel(20#,35#,45# etc),Stainless ... which has the advantage of relatively cheap price .Threaded flange:applies to the corresponding flange and pipe welding ... can withstand repeated bending and temperature fluctuations, reliable threaded sealing flange. Threaded flange which nominal pressure is 0.25 ~ ...