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3 на мерные длпны, упрочнение торцов трубы, термическую обработку в проходных печах и обрезку концов, отличающийс тем, что, с целью упрощени технологии, упрочнение торцов производ т путем механической обра-5 ботки. 4 2. Способ но и. 1, отличающийс тем, что упрочнение производ т путем закатки концевых участков внутрь трубы, 3. Способ по пп. 1 и 2, отличающийс тем, что упрочнение производ т одновременно с разделением на мерные длины.3 for dimensional dimpling, hardening of the pipe ends, heat treatment in continuous furnaces and trimming of the ends, characterized in that, in order to simplify the technology, the hardening of the ends is performed by mechanical shaping. 4 2. Method and. 1, characterized in that the hardening is carried out by rolling in the end portions inside the pipe; 3. The method according to claims. 1 and 2, characterized in that the hardening is carried out simultaneously with the division into measured lengths.
SU1780348A1972-04-291972-04-29
Method of making thin-walled welded pipes
SU487147A1
(en)