| abstract |
(57) [Summary] [Problem] Particularly, the carbon content is 0.10 to 0.50%. The present invention provides a metalworking method for obtaining tubes of various lengths for various dimensions and applications, made of steel and having tight tolerances. The method comprises preparing a starting material of a round bar of hot rolled steel, then peeling it, cutting it into at least one chunk, the chunk being perforated, and chemical Processing is performed. The mass is then compressed and, if necessary, a final lathe turned to obtain a final product such as a hydraulic or oil cylinder, a high-pressure filter casing, a high-pressure tube or bearing material. Processing and heat treatment are performed. |