Jfe Steel Corporation

Yasuhiro Murota

Yoshinori Watanabe

Shinichi Suzuki

Nobuyuki Ishikawa

Kazukuni Hase

Yusuke Terazawa

Yoshiaki Murakami

Nobuo Shikanai

Keiji Ueda

Naoki Takayama

Misao Ishikawa

Yusaku Takemura

Provided is an abrasion-resistant steel plate which has high hardness up to the mid-thickness part thereof although the steel plate is 50 mm or more, and can be manufactured at low cost. The abrasion-resistant steel plate has a specific chemical composition having DI* of 120 or more, where DI* is defined by the following Formula (1): DI*=33.85&#xd7;(0.1&#xd7;C)&#xd7;(0.7&#xd7;Si+1)&#xd7;(3.33&#xd7;Mn+1)&#xd7;(0.35&#xd7;Cu+1)&#xd7;(0.36&#xd7;Ni+1)&#xd7;(2.16&#xd7;Cr+1)&#xd7;(3&#xd7;Mo+1)&#xd7;(1.75&#xd7;V+1)&#xd7;(1.5&#xd7;W+1) . . . (1), has HBof 360 HBW10/3000 to 490 HBW10/3000, HBbeing a Brinell hardness at a depth of 1 mm from a surface, has a hardness ratio, HBto HB, of 75% or more, HBbeing a Brinell hardness at a mid-thickness position, and has a plate thickness of 50 mm or more.

Abrasion-resistant steel plate and method of manufacturing same

Provided is an abrasion resistant steel plate or steel sheet, suitable for use in construction machines, industrial machines, and the like, and a method for manufacturing the same. A steel plate or steel sheet has a composition containing 0.20% to 0.27% C, 0.05% to 1.0% Si, 0.30% to 0.90% Mn, P, S, 0.005% to 0.025% Nb, 0.008% to 0.020% Ti, 0.1% or less Al, and 0.0010% to 0.0060% N on a mass % basis, the composition further containing one or more of Cr, Mo, W, and B, the composition containing one or more of Cu, Ni, V, an REM, Ca, and Mg as required, the remainder being Fe and inevitable impurities. After being heated, a semi-finished product having the steel composition is hot-rolled and is subjected to reheat-quenching or direct quenching.

Abrasion resistant steel plate or steel sheet excellent in resistance to stress corrosion cracking and method for manufacturing the same

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Tokyo, Japan

Yasuhiro Murota