EP 3479915 B1 20210721 - ROLL OUTER LAYER MATERIAL FOR HOT ROLLING AND COMPOSITE ROLL FOR HOT ROLLING
Title (en)
ROLL OUTER LAYER MATERIAL FOR HOT ROLLING AND COMPOSITE ROLL FOR HOT ROLLING
Title (de)
AUSSENSCHICHTMATERIAL FÜR EINE WALZE ZUM WARMWALZEN UND ZUSAMMENGESETZTE WALZE ZUM WARMWALZEN
Title (fr)
MATÉRIAU DE COUCHE EXTERNE DE ROULEAU POUR LAMINAGE À CHAUD ET ROULEAU COMPOSITE POUR LAMINAGE À CHAUD
Publication
Application
Priority
- JP 2016174329 A 20160907
- JP 2017023663 W 20170628
Abstract (en)
[origin: EP3479915A1] An object is to provide an outer layer material of a hot rolling mill roll and a composite roll for hot rolling that have decreased pit defects on a roll surface and excellent resistance to surface roughening while ensuring wear resistance. An outer layer material of a hot rolling mill roll, has a composition containing, in mass%, C: 2.0 to 3.0%, Si: 0.2 to 1.0%, Mn: 0.2 to 1.0%, Cr: 4.0 to 7.0%, Mo: 3.0 to 6.5%, V: 5.0 to 7.5%, Nb: 0.5 to 3.0%, Ni: 0.05 to 3.0%, Co: 0.2 to 5.0%, and W: 0.5 to 5.0%, with the balance being Fe and incidental impurities, and the contents of C, Cr, Mo, V, Nb, Ni, and W satisfying the following expression (1); has 85% or more of a matrix microstructure being a tempered martensite and/or a bainite microstructure; and has a minor axis of tempered martensite or bainite of 0.5 to 3.0 µm; 0.05 ‰¤ % C ˆ’ % V × 0.177 ˆ’ % Nb × 0.129 ˆ’ % Cr × 0.099 ˆ’ % Mo × 0.063 ˆ’ % W × 0.033 + % Ni ‰¤ 4.0 where %C, %V, %Nb, %Cr, %Mo, %W, and %Ni each represent the respective content of each respective element (mass%).
IPC 8 full level
B21B 27/00 (2006.01); B22D 13/02 (2006.01); C21D 5/00 (2006.01); C21D 9/38 (2006.01); C22C 37/00 (2006.01)
CPC (source: EP KR)
B21B 27/00 (2013.01 - KR); B22D 13/02 (2013.01 - EP KR); B22D 19/08 (2013.01 - EP); B22D 19/16 (2013.01 - EP); C22C 38/46 (2013.01 - KR); C22C 38/48 (2013.01 - KR); C22C 38/58 (2013.01 - KR); B21B 27/032 (2013.01 - EP); C21D 5/00 (2013.01 - EP); C21D 9/38 (2013.01 - EP); C22C 37/00 (2013.01 - EP)
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 3479915 A1 20190508; EP 3479915 A4 20190807; EP 3479915 B1 20210721; BR 112019003360 A2 20190604; CN 109641250 A 20190416; CN 109641250 B 20201103; JP 6292362 B1 20180314; JP WO2018047444 A1 20180906; KR 102234330 B1 20210330; KR 20190029716 A 20190320; TW 201812028 A 20180401; TW I655295 B 20190401; WO 2018047444 A1 20180315
DOCDB simple family (application)
EP 17848389 A 20170628; BR 112019003360 A 20170628; CN 201780050783 A 20170628; JP 2017023663 W 20170628; JP 2017552525 A 20170628; KR 20197004864 A 20170628; TW 106123209 A 20170711