EP 1878514 A1 20080116 - PROCESS FOR PRODUCING SEAMLESS STEEL PIPE
Title (en)
PROCESS FOR PRODUCING SEAMLESS STEEL PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES NAHTLOSEN STAHLROHRS
Title (fr)
PROCEDE DE FABRICATION DE TUYAUX EN ACIER SANS SOUDURE
Publication
Application
Priority
- JP 2006302769 W 20060216
- JP 2005038689 A 20050216
Abstract (en)
A seamless steel tube is manufactured from a high alloy steel containing at least 5% of Cr while effectively preventing mandrel bar withdrawal troubles after elongation rolling of a material being rolled. A seamless steel tube of a high alloy steel containing at least 5% of Cr is manufactured by subjecting a material being rolled 3 to elongation rolling using a retained mandrel mill 1 in which the speed of a mandrel bar 2 in the axial direction is maintained constant while the speed of movement Vb of the mandrel bar 2, the speed Vi of the material being rolled 3 on the inlet side of the retained mandrel mill 1, and the speed Ve of the material being rolled 3 on the exit side of the retained mandrel mill 1 satisfy the relationship: 0.15 ‰Vb/{Vi + Ve)/2} ‰ 0.70 by controlling the speed of movement Vb of the mandrel bar 2.
IPC 8 full level
B21B 17/02 (2006.01); B21B 17/04 (2006.01)
CPC (source: EP US)
B21B 17/04 (2013.01 - EP US); B21B 37/78 (2013.01 - EP US); B21B 3/02 (2013.01 - EP US); B21B 2275/06 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1878514 A1 20080116; EP 1878514 A4 20090107; BR PI0608086 A2 20091110; CA 2598297 A1 20060824; CN 101160184 A 20080409; CN 101160184 B 20110928; MX 2007009772 A 20080310; RU 2007134439 A 20090327; RU 2357814 C1 20090610; US 2008047317 A1 20080228; WO 2006088107 A1 20060824; ZA 200707262 B 20080925
DOCDB simple family (application)
EP 06713910 A 20060216; BR PI0608086 A 20060216; CA 2598297 A 20060216; CN 200680012699 A 20060216; JP 2006302769 W 20060216; MX 2007009772 A 20060216; RU 2007134439 A 20060216; US 88960907 A 20070815; ZA 200707262 A 20070828