FIELD: process engineering.
SUBSTANCE: invention relates to machine building and can be used for fabrication of steel closed circular chamber filled with carbon dioxide under high pressure and made of steel pipes made from alloyed steels. Pipe is annealed with one end tightly plugged. Pipe is filled with aqueous solution of dichromate with concentration of 3-5 g/l as filler. Pipe with said solution is located in refrigerator chamber to bring said solution in pipes to crystallisation and held said pipes at a temperature for at least one hour. Now, pipe is bent.
EFFECT: higher rotundity in ring blank OD, better operating properties of the assembly and article.
1 ex
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