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《Iron & Steel》 2006-08
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Effect of Production Processes on Low Temperature Toughness of 420 MPa High Strength Shipbuilding Steel

WANG Hong~1,2,LIU Xiao-lin~1,2, CAI Qing-wu~1(1.Rolling Center,University of Science and Technology Beijing,Beijing 100083,China;2.Technology Center,Xinyu Iron and Steel Co.,Xinyu 338001,Jiangxi,China)  
The strong instability of-40℃ longitudinal impact strength of E42 shipbuilding steel observed in trial production was studied by using different processes.The results show that for two-phase rolling,the structure with mixed crystals is formed in product due to rolling in partially recrystallized zone caused by the effect of rolling piece thickness increment on deformation temperature of non-recrystallized zone,and as the result,the low temperature impact strength of product is reduced.On the other hand,the granular bainite is formed during cooling at improper rate after rolling,making low temperature impact strength lower,too.
【CateGory Index】: U668.2
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