EP 2857545 B1 20180613 - MANUFACTURING METHOD FOR PIERCING PLUG
Title (en)
MANUFACTURING METHOD FOR PIERCING PLUG
Title (de)
HERSTELLUNGSVERFAHREN FÜR DURCHSTECHSTECKER
Title (fr)
PROCÉDÉ DE FABRICATION POUR POINÇON DE PERÇAGE
Publication
Application
Priority
- JP 2012128175 A 20120605
- JP 2012128255 A 20120605
- JP 2013002657 W 20130419
Abstract (en)
[origin: EP2857545A1] Provided is a method for producing a plug for use in a piercing-rolling mill for producing a seamless steel tube/pipe, and the method for producing the plug includes a shotblasting step of carrying out shotblasting on a surface of the plug, and an arc-spraying step of performing arc-spraying of a spray wire so as to form a film on a surface of a base metal of the plug to which the shotblasting is applied. In the arc-spraying step, the arc-spraying is carried out by using, as the spray wire, a cored wire whose iron sheath tube is filled with at least low-thermal conductive particles (e.g. ZrO 2 particles) having lower thermal conductivity than that of iron oxide among iron particles and low-thermal conductive material, so as to form the film containing iron oxide, Fe and low-thermal conductive particles. Accordingly, it is possible to form the film having enhanced insulation performance, and to produce the plug capable of ensuring the steady enhancement of the durability life of the plug during the piercing-rolling.
IPC 8 full level
C23C 4/02 (2006.01); B21B 19/04 (2006.01); B21B 25/00 (2006.01); C23C 4/06 (2016.01); C23C 4/131 (2016.01)
CPC (source: CN EP US)
B21B 19/04 (2013.01 - CN EP US); B21B 25/00 (2013.01 - CN EP US); C23C 4/02 (2013.01 - CN EP US); C23C 4/04 (2013.01 - CN); C23C 4/06 (2013.01 - EP US); C23C 4/131 (2016.01 - EP US)
Citation (examination)
WO 2013161175 A1 20131031 - NIPPON STEEL & SUMITOMO METAL CORP [JP] & EP 2845656 A1 20150311 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2857545 A1 20150408; EP 2857545 A4 20160224; EP 2857545 B1 20180613; AR 091250 A1 20150121; CA 2866802 A1 20131212; CA 2866802 C 20161025; CN 104364413 A 20150218; CN 104364413 B 20160427; MX 2014012498 A 20150115; RU 2014153911 A 20160727; RU 2598414 C2 20160927; US 2015184276 A1 20150702; WO 2013183213 A1 20131212
DOCDB simple family (application)
EP 13800967 A 20130419; AR P130101946 A 20130603; CA 2866802 A 20130419; CN 201380029651 A 20130419; JP 2013002657 W 20130419; MX 2014012498 A 20130419; RU 2014153911 A 20130419; US 201314403612 A 20130419