PRODUCTION METHOD FOR ROUND STEEL BAR FOR SEAMLESS PIPE COMPRISING HIGH Cr-Ni ALLOY, AND PRODUCTION METHOD FOR SEAMLESS PIPE USING ROUND STEEL BAR

WIPO Patent Application WO/2012/086179

A1

When there is produced a round steel bar that comprises a high alloy containing Cr of 20 to 30 mass%, Ni of 30 to 50 mass%, and at least one kind of Mo and W that is 1.5 mass% in terms of Mo+0.5W, and in which a continuous casting slab having a rectangular cross section is slabbing rolled and the diameter of the starting material of the seamless pipe is 150 to 400mm, the slabbing rolling is conducted under a condition that satisfies the relationship 1.3≤H/D≤1.8, wherein H (mm) represents the short side length of the cross section of the slab and D (mm) represents the diameter of the round steel bar. This can lead to the production in which the pipe end is prevented from cracking and the seamless pipe can be produced at a good yield, particularly at the stage of perforation rolling, when the seamless pipe comprising high Cr-Ni alloy is produced by performing the perforation rolling on the round steel bar to mold it into a hollow pipe, performing a rolling stretch on the hollow pipe and further performing a rolling with a constant diameter on the resulting hollow pipe.

JP3504425	PRODUCTION OF STAINLESS STEEL PLATE
JPH06312248	SLAB AND MOLD

HIRASE NAOYA (JP)
SATOU TAKANORI (JP)

PCT/JP2011/007098

June 28, 2012

December 20, 2011

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SUMITOMO METAL IND (JP)
HIRASE NAOYA (JP)
SATOU TAKANORI (JP)

B21B1/02; B21B19/04; B21B23/00; C22C19/05; C22C30/00

JP2008161906A	2008-07-17
JP2009248112A	2009-10-29
JPS61140301A	1986-06-27
JP2007160363A	2007-06-28
JP2007160363A	2007-06-28
JPH04224659A	1992-08-13

See also references of EP 2656931A4

MORI, Michio et al. (JP)
Michio Mori (JP)

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