FIELD: rolled tube production, namely production of bimetallic tubes, possibly in tube rolling equipment with pilger mills.
SUBSTANCE: method comprises steps of centrifugal casting of hollow bimetallic billets with wear-resistant layer whose thickness consists 50 - 60% of whole thickness of billet wall; heating billets till yielding temperature and rolling bimetallic tubes in tube rolling aggregates with pilger mills at elongation degree no more than 9 that is at μ ≤ 9.0 and with wear resistant cladding layer whose thickness consists no more than 50% of whole thickness of billet wall. Bimetallic tubes rolled in pilger mills have wear resistant cladding layer whose thickness consists 75 - 85% of whole thickness of wall. Thickness of plastic layer is changed depending upon geometry dimensions of tubes and it is determined according to formula ti = 1.18t where t - thickness of cladding layer of bimetallic tubes with less diameter size, mm; ti - thickness of plastic layer of bimetallic tubes with diameter size next after said less diameter, mm; 1.18 - coefficienttaking into account increase of plastic layer according to increased diameter of tubes. Elongation factor of rolled tubes is decreased according to increased geometry size of tubes and it is determined by means of formula μi+1 = μi (Di /Di+1) where μi - elongation factor at rolling tubes of i-diameter of dimension row for bimetallic tubes; μI+1 - elongation factor at rolling tubes of (i+1) diameter of dimension row for bimetallic tubes; Di - diameter of i-dimension rowof bimetallic tubes, mm;Di+1 - diameter of (i+1)-dimension row, mm. Invention provides possibility for making high-quality elongated bimetallic tubes with length up to 10-12 m with increased by 1.5 -2.0 times wear resistant layer. Such tubes may be used for transporting abrasive loose materials in permafrost regions and allow not to use for such purpose tubes made in joint-stock company "Diamond Russia-Saha". Invention also provides increased by 1.5 - 2.0 times useful life period of tubes in comparison with that of tubes rolled according to known method.
EFFECT: improved operational parameters of tubes.
3 cl
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|---|---|---|---|
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