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Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof
Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof
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机译:在基材和焊接热影响区具有优异的低温韧性并且强度各向异性小的钢板及其制造方法
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摘要
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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