Name: welded flange, welded flange, socket welding flange, convex surface of the flange, welding neck collar loose flange, flange cover 
 Size: 1 / 2 "~ 80" (10-2000) 
 Pressure rating: 0.6Mpa ~ 32Mpa (150Lb ~ 2500Lb) 
 Material: 20 #, 304,304 L, 316,316 L, 321, and other materials 
 Common Standards: 
 National standard: GB9112-88 (GB9113 ? 1-88 ~ GB9123 ? 36-88) 
 American Standard: ANSI B16.5 Class150, 300,600,900,1500 (WN, SO, BL, TH, LJ, SW) 
 Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL) 
 German standard: DIN2573, 2572,2631,2576,2632,2633,2543,2634,2545 (PL, SO, WN, BL, TH) 
 Ministry of Chemical Industry Standard: HG5010-52 ~ HG5028-58, HGJ44-91 ~ HGJ65-91 
 Ministry of Machinery standard: JB81-59 ~ JB86-59, JB/T79-94 ~ JB/T86-94 
 Pressure Vessel: JB1157-82 ~ JB1160-82, JB4700-2000 ~ JB4707-2000 
 Applications: boiler and pressure vessel, petroleum, chemicals, shipbuilding, pharmaceutical, metallurgy, machinery, food industry 
 Quality Management: ISO9001: 2000 quality management system certification 
 Note: non-standard flanges can be customized