Effect of rolling process on impact toughness of Q690D heavy plate under DQ condition
In order to solve the problem of unstable impact toughness of 60 mm thickness Q690D plate under DQ process,the effects of casting billet thickness and single pass reduction of roughing rolling on impact toughness of the plate were analyzed.The results show that the good impact toughness of the plate needs to obtain a certain proportion of lath bainite,granular bainite and polygonal ferrite.The thickness of the casting billet should be increased as far as possible to ensure that the thickness of the casting billet is above 335 mm(compression ratio is above 5.5)and the reduction of the roughing rolling is above 40 mm for at least 1 pass.
Q690D heavy platedirect quenchingimpact toughnessthickness of casting billetreduction amountmicrostructure
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