为降低成本，取消了晶粒细化元素V的加入，对造成的晶粒粗化通过优化轧制工艺进行弥补，并对试制的DH36船板进行综合性能评价。结果表明，钢板组织为铁素体和珠光体，晶粒度不低于8.5级；-40℃冲击功＞80 J，韧脆转变温度低于-20℃，轧制态综合机械性能良好，满足船板综合评价要求；钢板焊接接头冲击韧性略低于母材，符合船板综合评价的要求，吨钢降低成本25元。%To reduce the cost, although the addition of grain refining element V was cancelled in the process of steel-making for DH36, and the performance of DH36 by adjusting the rolling parameter in the approved range can be ensured. The results of comprehensively evaluating and the properties of trial DH36 showed that the microstructure is the ferrite and pearlite, the ferrite grain size grade is no less than 8.5, the absorbed energy of impact test is no less than 80 J at-40 ℃, the FATT is lower than-20 ℃, the comprehensive mechanical properties in rolling condition are good and meet the requirements of society rule. The mechanical properties in welding are a few lower than those in rolling condition, but can meet the requirements of society rule too. And finally the cost of 25 Yuan RMB per ton of steel can be reduced.
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