Hot extruded steel pipe is used in the production of the hot extrusion process to manufacture seamless steel tubes.

Hot extrusion is widely used in the production of aluminum, copper, and other nonferrous metals pipes and profiles. Hot extrusion of steel for the production of both special pipes and profiles is difficult to use for the production of cold extrusion or extrusion of the solid and warm center of the hole (through-hole or blind hole) carbon steel and alloy steel parts, such as a rod having a thick head, barrel, containers, etc. Hot extrusion of dimensional accuracy and surface finish is better than hot forging parts but still needs to go through with the part of the general finishing or machining.

Hot extrusion technology is a kind of metal above the recrystallization temperature of extrusion, the tube billet from a die extrusion, in order to get die shape cross-section pipe metal forming method. In the hot extrusion process (from the pipe to the Arakawa tube), the tube billet is deformation under the three to compressive stress state. This not only can solve the problem of less-deformable steel pipe forming but also can avoid tubes inside and outside the surface defects caused by tensile stress. So hot extrusion molding method is particularly suitable for all kinds of alloy steel, stainless.