... Certificate: GB/T9112-2000 Material: stainless steel 304 316 304 carbon steel flange and stainless steel flange 1. for loaders, excavators, grader flanges.2 ... welding flange. 2. Flange material common flange materials: stainless steel 304 304 304 304 carbon steel 20 # Q235 Q345, etc 3. China's ... PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 series series 2: PN0.25 PN0.6, PN2 ...