Steel plate that exhibits excellent low-temperature...

Details Steel plate that exhibits excellent low-temperature... Steel plate that exhibits excellent low-temperature...

2011-06-28

2011-06-28

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S336000, C148S653000, C148S654000

Reexamination Certificate

active

07967923

ABSTRACT:
The present invention provides a steel plate that exhibits excellent low-temperature toughness in a base material and a weld heat-affected zone and has small strength anisotropy, wherein the steel includes, by mass, C: 0.04%-0.10%; Si: 0.02%-0.40%; Mn: 0.5%-1.0%; P: 0.0010%-0.0100%; S: 0.0001%-0.0050%; Ni: 2.0%-4.5%; Cr: 0.1%-1.0%; Mo: 0.1%-0.6%; V: 0.005%-0.1%; Al: 0.01%-0.08%; and N: 0.0001%-0.0070%, with the balance including Fe and inevitable impurities, a Ni segregation ratio at a portion located at one-fourth of a thickness of the steel plate in a steel-plate thickness direction from a surface of the steel plate is 1.3 or lower, a degree of flatness of a prior austenite grain is in a range from 1.05 to 3.0, an effective diameter of crystal grain is 10 μm or lower, and a Vickers hardness number is in a range of 265 HV to 310 HV.

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International Search Report for PCT/JP2009/005084 mailed Dec. 15, 2009.

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