B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
154/142, 113/47,
B21D 21/00 (2006.01) B23K 35/40 (2006.01) C21C 7/00 (2006.01) F16L 59/00 (2006.01)
Patent
CA 1275616
POWDER FILLED TUBE AND A METHOD FOR THE CONTINUOUS MANUFACTURE OF SUCH TUBE ABSTRACT OF THE DISCLOSURE A powder filled tube has a steel outer wall which consists of two layers formed as two complete turns of a spiral made from a single strip and welded together at their interface to form a unitary wall. The method for the continuous manufacture of this tube involves (i) forming a steel strip into a channel, (ii) introducing the powder filling into the channel, (iii) closing the channel by rolling it into a tube in which, as seen in cross section, the steel strip overlaps itself by at least 360° so that the tube wall has two layers around its whole circumference and the powder filling is compacted, (iv) heating the tube and while hot subjecting it to stretch/reduction rolling in which simultaneous size reduction and extension of length take place and in which the two wall layers are welded together by the effect of the elevated temperature and the pressure applied in rolling.
529327
de Zeeuw Johan
Hoogovens Groep Bv
Ridout & Maybee Llp
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