FIELD: metallurgy.
SUBSTANCE: cold rolling of pipes is implemented with drawing out μ=1.5-1.6, single-pass drawing of round pipe without internal tool, is implemented with drawing out μ=1.15-1.17, and single-pass drawing of round pipe through profile ring is implemented with clamping by wall with minimal section, equal to 3.0-3.5 mm with underspeed not more 10 m/min on floating plug mandrel, length of tapered part of pipe exceed length of conical part of profile ring.
EFFECT: pipes with high-precision external hexahedral profile and internal hole with minimal discharge coefficient of defined metal and with efficient production.
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