FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling and may be used in production of high-strength oil pipes by preparing well casing and oil-well tubing for thread cutting with temperature of 500-720°C after heat treatment. Proposed method comprises gaging the pipes in multi-roll sizing mill passes. It comprises also sizing the pipes to preset OD with ovality not exceeding 0.6 mm in round-pass rolls without tapers ,pass size being defined by: Dp=Dt·(1+α-t), where Dp is pass diameter, mm; Dt is preset pipe OD, mm; α is pipe material linear expansion factor, -10-6 degree-1; t is pipe temperature, °C. Note here that pass sizes are equal for every mill to ensure ovality not exceeding 0.6 mm in one pass.
EFFECT: lower labour input, high quality of preparation for thread cutting.
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