PROBLEM TO BE SOLVED: To provide a structural high-strength thick steel plate being excellent in the property of preventing brittle crack propagation, having a thickness of not less than 50 mm, and being suited for use in ships, and to provide a production method thereof.;SOLUTION: A thick steel plate excellent in the property of preventing brittle crack propagation is characterized in that it has a metallographic structure composed of mainly bainite, it has such a texture that the density in the RD//(110) plane at the plate thickness center is not less than 1.5, the Charpy fracture surface transition temperature vTrs at the plate surface and at the plate thickness center is -40°C or lower, and more desirably, the Charpy fracture surface transition temperature and the density in the RD//(110) plane at the plate thickness center satisfy formula (1): vTrs(1/2t)-12×IRD//(110) [1/2t]≤-70, wherein vTrs(1/2t) is the fracture surface transition temperature (°C) at the plate thickness center and I RD//(110)[1/2t] is the density in the RD//(110) plane at the plate thickness center.;COPYRIGHT: (C)2013,JPO&INPIT
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机译：解决的问题：提供一种结构性高强度厚钢板，其具有优异的防止脆性裂纹扩展的特性，并且厚度不小于50mm，并且适合在船上使用，并且提供一种生产方法SOLUTION：一种具有优异的防止脆性裂纹扩展性能的厚钢板，其特征在于，该钢板具有主要由贝氏体组成的金相组织，并且其织构使得RD //（110）面的密度为板厚中心为1.5以上，板面及板厚中心的夏比断裂面转变温度 v T rs ，更理想的是，夏比断裂面的转变温度和板厚中心处的RD //（110）面的密度满足公式（1）： v T rs（1 / 2t） -12×I RD //（110）[1 / 2t] ≤-70，其中 v T rs（1 / 2t ）是板厚中心处的断裂表面转变温度（°C），I RD //（110）[1 / 2t] 是板厚中心处的RD //（110）平面中的密度。;版权：（C）2013，JPO＆INPIT
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