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Title:
THICK STEEL SHEET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/043067
Kind Code:
A1
Abstract:
A thick steel sheet: which contains C: 0.04-0.06 mass%, Si: 0.35-0.45 mass%, Mn: 1.49-1.59 mass%, P: greater than 0 mass% to 0.01 mass%, S: greater than 0 mass% to 0.002 mass%, Cu: 0.23-0.33 mass%, Al: 0.02-0.06 mass%, Ni: 0.24-0.34 mass%, Nb: 0.015-0.021 mass%, Ti: 0.012-0.018 mass%, B: 0.0007-0.0013 mass%, Ca: 0.0010-0.0030 mass%, and N: 0.0040-0.0060 mass%, the balance being made of iron and unavoidable impurities; and in which the metal structure comprises a first phase and a hard second phase that is harder than the first phase, said hard phase being a phase made of pearlite, and the hardness of the second phase being 260 HV or less.

Inventors:
TONAN TOMOYUKI
Application Number:
PCT/JP2017/028790
Publication Date:
March 08, 2018
Filing Date:
August 08, 2017
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/16; C22C38/58
Domestic Patent References:
WO2013015428A12013-01-31
Foreign References:
JP2009235514A2009-10-15
JP2012172258A2012-09-10
JP2014055317A2014-03-27
JP2008045195A2008-02-28
JP2015127447A2015-07-09
JPH108188A1998-01-13
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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