低成本Q345钢高强度厚板的开发
Development of Low Cost Q345 High Strength Heavy Steel Plate
摘 要
采用TMCP工艺制备了厚度为85 mm的Q345高强度钢板,通过拉伸和冲击试验、组织及断口形貌观察等对其组织和性能进行了分析.结果表明:制备的Q345钢厚板的表面组织为多边形铁素体＋大量贝氏体的混合组织,其余部位均为铁素体＋珠光体组织,屈服强度达到320 MPa以上,伸长率在29%以上,冲击韧性良好;该钢不添加微合金元素,轧后不进行热处理,降低了生产成本,实现了强韧性的良好匹配.
宽厚板
TMCP工艺
组织
力学性能
Q345 steel
wide and heavy plate
TMCP technology
microstructure
mechanical property
Abstract
The 85 mm Q345 high strength heavy steel plates were prepared through thermo-mechanical controll cooling (TMCP) process.By means of tensile and impact tests,microstructure and fracture morphology observation,the microstructure and properties of the heavy plates were studied.The results indicat that the microstructure of the Q345 steel heavy plates consisted of polygon ferrite and large quantity of bainite at the surface,besides ferrite and pearlite in other positions.The yield strength was up to 320 MPa,elongation was more than 29% and impact ductility was good.The cost of production was reduced without adding microalloying elements and heat treatment process after rolling.The strength and toughness of the heavy plate matched perfectly.
中图分类号 TG335.5
所属栏目 新材料 新工艺
基金项目 国家自然科学基金重点资助项目(50634030);国家科技支撑计划资助项目(2006BAE03A08)
收稿日期 2008/9/22
修改稿日期 2009/5/13
网络出版日期
作者单位点击查看
备注李婧(1982-),女,辽宁沈阳人,博士研究生.
引用该论文: LI Jing,ZHAO De-wen,LIU Xiang-hua,DU Lin-xiu,HE Yuan-chun,SUI He-long. Development of Low Cost Q345 High Strength Heavy Steel Plate[J]. Materials for mechancial engineering, 2009, 33(10): 68～71
李婧,赵德文,刘相华,杜林秀,何元春,隋鹤龙. 低成本Q345钢高强度厚板的开发[J]. 机械工程材料, 2009, 33(10): 68～71
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参考文献
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【2】李婧,赵德文,杜林秀,等.Q345C高强度厚板TMCP工艺[J].东北大学学报:自然科学版,2008,29(3):343-346.
【3】杨雄,金永春,王全礼,等.V-N微合金化高强度厚板的研制[J].钢铁钒钛,2005,26(1):16-19.
【4】常跃峰,赵文忠.SM570正火型特厚高强钢板的强化设计及应用[J].宽厚板,2000,6(1):13-20.
【5】杜林秀.低碳钢变形过程及冷却过程的组织演变与控制[D].沈阳:东北大学,2003:38-58.
【6】HUANG Y D,FROYEN L.Important factors to obtain homogeneous and ultrafine ferrite pearlite microstructure in low carbon steel[J].J Mater Process Technol,2002,124(1/2):216-226.
【7】LIU Y C,ZHU F X,LI Y M,et al.Effect of TMCP parameters on the microstructure and properties of an Nb-Ti microalloyed steel[J].ISIJ International,2005,45(6):851-857.
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