B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
26/155, 148/35.7
B21C 37/06 (2006.01) C22F 1/18 (2006.01)
Patent
CA 2003244
A method of manufacturing a seamless tube formed of a titanium material, such as pure titanium or titanium alloys, by the use of the Mannesmann's method. At first, an ingot formed of the titanium material is processed under the con- ditions that a heating temperature is 850 to 1,250 °C, the final temperature being 600 to 1,100 °C, and a working degree being 50 % or more to be turned into a solid billet. The resulting solid billet is subjected to a piercing within a temperature range of .beta. transus - 100 to 1,250 °C to be turned into a hollow piece. In this piercing process, in- clined rolls of a piercer are descaled. The resulting hol- low piece is in case of need regulated a size thereof sub- jected to an elongating to be turned into a hollow shell. Subsequently, the resulting hollow shell is subjected to a reducing (reducing conditions: temperature at an inlet side of the mill is 600 to 1,100 °C and a reduction of outside diameter is 80 % or more) by means of a reducer mill or to a sizing (sizing conditions: temperature at an inlet side of the mill is 550 to 1,150 °C and a reduction of outside diameter is 3 to 15 %) by means of a sizer mill.
Kawabata Hiroki
Kimura Shigemitsu
Kuroda Atsuhiko
Nakajima Kazuhiro
Nakanishi Tetsuya
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Sumitomo Metal Industries Ltd.
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