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STEEL PLATE WHICH EXHIBITS EXCELLENT LOW-TEMPREATURE TOUGHNESS BOTH IN BASE METAL AND IN WELD-HEAT AFFECTED ZONE AND HAS SMALL STRENGTH ANISOTROPY AND PROCESS FOR MANUFACTURING SAME
STEEL PLATE WHICH EXHIBITS EXCELLENT LOW-TEMPREATURE TOUGHNESS BOTH IN BASE METAL AND IN WELD-HEAT AFFECTED ZONE AND HAS SMALL STRENGTH ANISOTROPY AND PROCESS FOR MANUFACTURING SAME
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机译：钢板在母材和焊接热影响区均表现出出色的低温韧性，并且具有各向异性小且制造工艺相同的特点
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摘要
A steel plate which exhibits excellent low-temperature toughness both in base metal and in a weld-heat affected zone and has small strength anisotropy. The steel plate has a steel composition which contains by mass% C: 0.04 to 0.10%, Si: 0.02 to 0.40%, Mn: 0.5 to 1.0%, P: 0.0010 to 0.0100%, S: 0.0001 to 0.0050%, Ni: 2.0 to 4.5%, Cr: 0.1 to 1.0%, Mo: 0.1 to 0.6%, V: 0.005 to 0.1%, Al: 0.01 to 0.08%, and N: 0.0001 to 0.0070% with the balance consisting of Fe and unavoidable impurities, and exhibits, at a depth of 1/4 of the thickness of the steel plate from the surface thereof, an Ni segregation ratio of 1.3 or lower, a prior austenite flakiness of 1.05 to 3.0, an effective grain diameter of 10μm or smaller, and a Vickers hardness of 265 to 310HV.
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