【摘 要】
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The effect of chemical composition and process on high strenth shipbuilding steel has been studied in this paper.The lab research reveals that the addition
【机 构】
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Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China
【出 处】
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第十届中国钢铁年会暨第六届宝钢学术年会
论文部分内容阅读
The effect of chemical composition and process on high strenth shipbuilding steel has been studied in this paper.The lab research reveals that the addition of Al、Cr、Ni elements to the Nb、Ti microalloyed C-Mn steel will promote the formation of acicular ferrite microstructure.And strength will be improved significantly,at the same time the low temperature toughness is also improved and maintain high values,the Charpy impact value at-60℃ is over 300J.According to lab research,the EH47 grade steel the yield strength of which is over 460MPa has been trial-produced in the mill.And its mechanical properties,especially low temperature crack-arrest toughness have been analysed.The results of temperature gradient double-tension crack-arrest test show that the brittle crack arrest toughness(Kca)of the 50mm thick industrial trial-produced plate is over 9000N/mm3/2,which is much bigger than the standard of classification society,Kca> 6000N/mm3/2 at-10℃.Variable energy instrumented DWTT has been explored to measure the crack-arrest toughness,the result is Kca=7240N/mm3/2,but the relationship between them needs much research.
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