FIELD: metallurgy. SUBSTANCE: essence of this process resides in manufacturing conversion cylinder from steel that hardens in air. Cylinder wall thickness difference is , wherein: Pcyl and Ppipe denote wall thickness difference of conversion cylinder and finished pipe, respectively and tcyl and tpipe represent thickness of walls of conversion cylinder and finished pipe, respectively. Disclosed process includes such steps as preliminary heat treatment, cold shaping and strengthening heat treatment of conversion cylinder. EFFECT: better mechanical properties and higher dimensional accuracy. 5 cl, 1 tbl
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Authors
Dates
1995-03-27—Published
1993-02-03—Filed