The image shows a collection of Forged Steel ASTM A105 Weld Neck (WN) Flanges.
These flanges are made from carbon steel, specifically the ASTM A105 material, known for its strength and durability in pressure systems at ambient and higher-temperature service. The "Weld Neck" design indicates they have a long tapered hub which is butt-welded to the pipe, providing superior reinforcement and stress distribution compared to other