锆处理低碳低合金高强度钢的杂质控制

针对传统工艺技术生产的高强度低合金钢(HSLA)中杂质较高、性能不稳定等缺陷,改进了冶炼及连铸过程中一些工艺,形成了一套自主操作技术.生产的锆处理HSLA钢杂质含量显著降低,加入合金元素锆经改进工艺生产的钢板中夹杂物的大小、形态及分布均得到了明显改善,形成颗粒细小、圆形或近圆形、呈弥散分布的夹杂物.经电子探针和能谱分析表明,夹杂物一般是由Ti2O3、Al2O3、ZrO2及MnS组成的复合夹杂物,Ti2O3、Al2O3、ZrO2位于复合夹杂物的中心部位,MnS位于外层.锆处理和新工艺联合应用有效地改善了钢中夹杂物的特性,生产的HSLA钢板质量大幅度提高,具有良好的力学性能.

Impurity Control of Zr Alloyed Low Cabon HSLA Steel

The high strength low alloy(HSLA) steels made with conventional processes have a high level of impurity and unstable mechanical properties.Some procedures were adjusted and improved forming a special technology for production of the relatively pure HSLA steel.The Zr alloyed HSLA steel made with the new technology exhibits low impurity.The content,size,shape and distribution of inclusions in such HSLA steel are remarkably modified by Zr addition.The inclusions are fine,spheric or near spheric in shape and disperse.Electron Probe and Energy Spectrum study reveal that the inclusions in such Zr alloyed HSLA steel are complex containing Ti_2O_3,Al_2O_3,ZrO_2 located in the center and MnS lying on the surface.The specifics of inclusions are modified by Zr treatment and new technology.Thus the properties of Zr HSLA plate are improved greatly.