| 摘要 |
<p>A manufacture method of high precision seamless steel pipes, its hot- rolling process includes: cutting margins, forming circular pipes, high frequency welding, removing welding burrs, checking up, heating, rolling, determining the diameters, cooling, inspecting; its cold drawing and cold rolling process includes: cutting margins, forming circular pipes, high frequency welding, removing welding burrs, checking up, heating, hammering pipe ends, acid cleaning, phosphate treating, saponifying, cold drawing or cold rolling with core dies, annealing, straightening, cutting heads and ends and inspecting.</p> |
