In the 17th century, the French used a manual screw press to squeeze out the lead pipe, which was used as a water pipe, which was the beginning of cold extrusion. At the end of the 19th century, cold extrusion of zinc, copper and copper alloys was achieved, and in the early 20th century it was expanded to extrusion of aluminum and aluminum alloys. In the 1930s, the Germans invented the phosphating and saponifying surface anti-friction treatment technology, which made the cold extrusion of steel successful, and was originally used to extrude steel casings
