EP 1023952 B1 20020522 - Dual roll cross-rolling mill and method for rolling hollow billets of high-alloy steels
Title (en)
Dual roll cross-rolling mill and method for rolling hollow billets of high-alloy steels
Title (de)
2-Walzen-Schrägwalzwerk und Verfahren zur Herstellung von Hohlblöcken aus hochlegierten Stählen
Title (fr)
Laminoir à deux cylindres obliques et méthode de laminer des blocs creux en aciers hautement alliés
Publication
Application
Priority
DE 19903974 A 19990126
Abstract (en)
[origin: US6260396B1] A 2-roll piercing mill for producing hollow blocks from a rolled material comprising high alloy steels has guide tools for the rolled material. The guide tools are arranged for closing a reforming zone of the piercing mill transversely with respect to the rolling axis as the hollow block is pierced. In this arrangement, each of the guide tools includes a base body made of a carrier material and a working face made of a material that has antiadhesive properties with respect to high alloy steels and high hot strength. Prior to the piercing operation, the temperature of either the working face or the entire guide tool is raised above room temperature to avoid high thermal stresses.
IPC 1-7
IPC 8 full level
B21B 19/02 (2006.01); B21B 19/04 (2006.01); B21B 25/00 (2006.01); B21B 3/02 (2006.01); B21B 9/00 (2006.01)
CPC (source: EP US)
B21B 19/04 (2013.01 - EP US); B21B 3/02 (2013.01 - EP US); B21B 9/00 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 6260396 B1 20010717; AT E217813 T1 20020615; DE 19903974 A1 20000727; DE 50000172 D1 20020627; EP 1023952 A1 20000802; EP 1023952 B1 20020522; ES 2173069 T3 20021016; JP 2000225403 A 20000815; JP 4624514 B2 20110202
DOCDB simple family (application)
US 49182200 A 20000126; AT 00250015 T 20000118; DE 19903974 A 19990126; DE 50000172 T 20000118; EP 00250015 A 20000118; ES 00250015 T 20000118; JP 2000012797 A 20000121