HOT-ROLLED STEEL SHEET HAVING EXCELLENT COLD WORKABILITY AND EXCELLENT SURFACE PROPERTIES AND HARDNESS AFTER WORKING

Title:

HOT-ROLLED STEEL SHEET HAVING EXCELLENT COLD WORKABILITY AND EXCELLENT SURFACE PROPERTIES AND HARDNESS AFTER WORKING

Document Type and Number:

WIPO Patent Application WO/2015/033933

Kind Code:

A1

Abstract:

A hot-rolled steel sheet which has a thickness of 3-20 mm and contains specific amounts of C, Si, Mn, P, S, Al and N, with the balance made up of iron and unavoidable impurities. This hot-rolled steel sheet contains a specific amount of solid-solved N, and the contents of C and N satisfy the relation 10C + N ≤ 3.0. This hot-rolled steel sheet contains bainitic ferrite and pearlite, respectively in an area ratio of 5% or more and in an area ratio of less than 20% relative to the whole structure, with the balance made up of polygonal ferrite. The average crystal grain size of the bainitic ferrite is 3-50 μm.

Inventors:

KAJIHARA KATSURA
KOCHI TAKUYA

Application Number:

PCT/JP2014/073075

Publication Date:

March 12, 2015

Filing Date:

September 02, 2014

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)

International Classes:

C22C38/00; C22C38/40; C21D8/02; C21D9/46

Foreign References:

JP2003231946A	2003-08-19
JP2014148739A	2014-08-21
JP2003268491A	2003-09-25
JP2002206138A	2002-07-26
JP2010280967A	2010-12-16
JP2010202904A	2010-09-16
JP2005298967A	2005-10-27
JP2009019265A	2009-01-29
JP2004332099A	2004-11-25
JP2005154906A	2005-06-16

Attorney, Agent or Firm:

HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)

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