HSLA Q345D中厚板韧脆转变温度测定与分析  

Determination and Analysis of Tough-Brittle Transition Temperature for HSLA Q345D Heavy Plate

作　　者：薛宪营 刘奉家 秦军 赵虎 

机构地区：[1]宝钢集团新疆八一钢铁股份有限公司制造管理部,新疆乌鲁木齐830022 [2]宝钢集团新疆八一钢铁股份有限公司中厚板厂,新疆乌鲁木齐830022

出　　处：《钢铁》2011年第10期94-98,共5页Iron and Steel

摘　　要：研究了Q345D低合金高强度中厚板冲击功、侧膨胀率和断面纤维率与温度之间的关系,并利用Boltzmann函数拟合法对不同厚度Q345D中厚板的韧脆转变温度进行了界定。结果表明:拟合所得到的韧脆转变温度各不相同,而且厚规格试样的韧脆转变温度低于薄规格试样的韧脆转变温度。经过优化Q345D连铸坯的连铸和控轧工艺,使Q345D低温韧性有了大幅度提高。Relationship among impact energy, lateral expansion, percent of fibroustiy and temperature of HSLA Q345D heavy plate were investigated. Tough-brittle transition temperature （TBTT） was determined on HSLA Q345D heavy plate with different thickness using Boltzmann function fitting method. Results show that TBTT ob- tained through fitting varies from each other, and TBTT of the thicker samples is lower than that of the thin sam- ples. The low temperature toughness of Q345D was improved to a large extent through optimizing process parame ters of continuous casting and controlled rolling process.

关 键 词：Q345D 韧脆转变温度 Boltzmann函数 拟合 

分 类 号：TG115[金属学及工艺—物理冶金]