FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling and can be used at pipe rolling plants with Pilger mill at production of 325-550 mm diameter pipes with different wall depth. Composite mandrel comprises cylindrical working part and guide part, solid core screwed to lock part. Said lock part is made of "5Х2М1Ф"-grade steel or steel resisting impact stress while core is made of carbon steels. Working and guide parts are produced by rolling "25Х2М1Ф"-grade steel at Pilger mill.
EFFECT: uniform wall thickness and lower consumption of heat-resistant steel.
2 cl, 1 dwg
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