ABRASION-RESISTANT STEEL PLATE AND MANUFACTURING PROCESS THEREFOR

Title:

ABRASION-RESISTANT STEEL PLATE AND MANUFACTURING PROCESS THEREFOR

Document Type and Number:

WIPO Patent Application WO/2014/020891

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide: an abrasion-resistant steel plate which exhibits excellent impact-abrasion resistance characteristics and which is suitable for use in construction machinery, shipbuilding, steel tubing, civil engineering, architecture and so on; and a manufacturing process therefor. In view of the problem, this abrasion-resistant steel plate is characterized in that: the steel plate has a specific steel composition; the DI* defined by formula (1) is 100 to 250; the surface layers of the plate comprise at least 90% of martensite in area fraction and exhibit a Brinell hardness of 450HBW10/3000 or more; and the thicknesswise central zone of the plate comprises at least 70% of lower bainite in area fraction, the thicknesswise central zone being a zone which spreads from the position corresponding to one half of the plate thickness to the positions corresponding to depths of 0.5mm from both surfaces. DI*=33.85 × (0.1×C)0.5 × (0.7×Si+1) × (3.33×Mn+1) × (0.35×Cu+1) × (0.36×Ni+1) × (2.16×Cr+1) × (3×Mo+1) × (1.75×V+1) × (1.5×W+1) ··(1) [wherein the symbols of elements represent the contents (mass%) of the elements respectively]

Inventors:

UEDA KEIJI (JP)
MIURA SHINICHI (JP)
ISHIKAWA NOBUYUKI (JP)

Application Number:

PCT/JP2013/004587

Publication Date:

February 06, 2014

Filing Date:

July 29, 2013

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D8/02; C22C38/54

Foreign References:

JP2012031511A	2012-02-16
JP2011214120A	2011-10-27
JP2004300474A	2004-10-28
JP2002080930A	2002-03-22
JP3273404B2	2002-04-08
JP4238832B2	2009-03-18
JP4259145B2	2009-04-30
JP4645307B2	2011-03-09

Other References: