Product Name: Alloy 20 Weld Neck Flange
Design Standard: ASME B16.5
Material: UNS N08020, Alloy 20
Size: 3 Inch, DN80
Pressure: Class 150 LB, PN20
Wall Thickness: SCH STD
Key Features: Excellent corrosion resistance, particularly in sulfuric acid and chloride-containing environments

Source: https://www.landeeflange.com/alloy-20-weld-neck-flange-asme-b16-5-uns-n08020-3-inches.html