利用Q345D连铸坯料,采用TMCP工艺进行了规格90 mm高强度厚板工业试验,研究了奥氏体未再结晶区总变形量对厚板组织性能的影响.结果表明,终轧温度800～750℃,终冷温度670～630℃时,调整奥氏体未再结晶区总变形量,钢板强度可达Q420E级,表面组织为沿奥氏体晶界析出的多边形先共析铁素体+贝氏体,心部为铁素体+珠光体.随着未再结晶区总变形量由25%增加到36%,钢板晶粒细化,z向性能提高,内部质量改善.目前,钢板批量试制产量已达4 200 t.
The industrial trials of 90 mm-gauge heavy plate steel were carried out through thermal mechanical control process (TMCP) with Q345D continuously cast slabs. The effect of total reduction in austenite non-recrystalliza-tion zone on microstructure and mechanical property was studied. The results indicate that using finishing rolling temperature 800-750℃, finishing cooling temperature 670-630℃, and adjusting the total reduction in austenite non-recrystallization zone, the strength of the heavy plate can reach the level of Q420E. The microstructure in sur-face layer consists of bainite and polygon proeutectoid ferrite which precipitated along the original austenite grain boundary, but in centre it consists of polygon ferrite and pearlite. As the total reduction in austenite non-recrystal-lization zone was increased from 25% to 36%, the grain was refined,z-direction property was enhanced and inter-nal soundness was improved. Up to the present, 4 200 t heavy plates have been successfully produced by using 36% to-tal reduction in austenite non-recrystallization zone.
参考文献
| [1] | Kozaburo Otani;Keiichi Hattori;Hirohide Muraoka .Develop-ment of Ultraheavy Gauge (210 mm Thick) 800 N/mm2Ten-sile Strength Plate Steel for Racks of Jack-up Rigs[J].NIPPON STEEL TECHNICAL REPORT,1993,58:1. |
| [2] | 杨雄,金永春,王全礼,张功焰.V-N微合金化高强度厚板的研制[J].钢铁钒钛,2005(01):16-19. |
| [3] | 齐俊杰;黄运华;张跃.微合金化钢[M].北京:冶金工业出版社,2006 |
| [4] | 孙齐松,王新华,许晓东,江东才,白学军.中厚钢板缺陷分析及原因探讨[J].钢铁,2007(08):41-45. |
| [5] | 李春梅.厚规格20g钢板超声波探伤不合原因分析[J].宽厚板,2007(04):15-17. |
| [6] | 刘晓美,高峰.Z向断面收缩率与塑性夹杂物级别的关系[J].物理测试,2006(03):26-28. |
| [7] | 田村今男.高强度低合金钢的控制轧制与控制冷却[M].北京:冶金工业出版社,1992 |
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