A thick-walled blind flange is a product used to seal the end of stainless steel pipes. It is a type of product that is used when a pipe reaches its end or to create a container by welding two blind flanges at both ends of a circular pipe. Similar products include blind plates, pipe caps, and plugs, etc.

Elliptical heads are used for medium and low-pressure vessels due to their good comprehensive performance. The heads apply external force to the metal billet (excluding sheet metal) to induce plastic deformation, alter dimensions and shape, and are used for the forming process of mechanical parts, workpieces, tools, or blanks. When the temperature exceeds 300-400°C (the blue brittleness zone of steel) and reaches 700-800°C, the resistance to deformation will急剧 decrease. Depending on forging in different temperature regions, and the varying requirements for forging piece quality and process, it can be divided into three forming temperature regions: cold forging, warm forging, and hot forging. Originally, there were no strict boundaries for the division of these temperature regions. Generally, forging within the recrystallization temperature region is called hot forging, and forging without heating at room temperature is called cold forging. During low-temperature forging, the size change of the forging is minimal. Stainless steel heads forged below 700°C have less scale formation and no decarburization on the surface.