摘要
以50 mm厚规格Q460C工程机械用钢的成分体系和现有生产工艺流程为基础,结合全厚度金相组织、维氏硬度和冲击性能试验,分析了抗拉强度不合格的原因,并确定了Q460C钢的金相组织和各种性能之间的内在关系。认为中间态组织能大幅提高Q460C的强度,但不利于韧塑性改善;魏氏组织对Q460C钢强度影响不大,但会降低韧塑性。通过优化现场控冷工艺,适当提高终冷温度、降低冷速,减少Q460C钢厚度方向魏氏体+中间组织,增加铁素体+珠光体组织后,抗拉强度控制到620~690 MPa,解决了抗拉强度不合格的问题。
Based on the composition system and existing production process of 50 mm thick Q460C steel for construction machinery,combined with full thickness metallographic structure,Vickers hardness and impact property test,the causes of unqualified tensile strength were analyzed,and the internal relationship between metallographic structure and various properties of Q460C steel was determined.It is considered that the intermediate structure can greatly improve the strength of Q460C,but it is not conducive to the improvement of toughness and plasticity;widmanstatten structure has little effect on the strength of Q460C steel,while it will reduce the toughness and plasticity.By optimizing the field controlled cooling process,properly increasing the final cooling temperature,reducing the cooling rate,reducing the widmanstatten+intermediate structure in the thickness direction of Q460C steel,and increasing the ferrite+pearlite structure,the tensile strength is controlled to 620~690 MPa,which solves the problem of unqualified tensile strength.
作者
张卫攀
陈子刚
杜琦铭
张瑞超
孙电强
Zhang Weipan;Chen Zigang;Du Qiming;Zhang Ruichao;Sun Dianqiang(Technical Center of HBIS Group Hansteel Company, Handan, Hebei, 056015)
出处
《河北冶金》
2021年第3期61-65,共5页
Hebei Metallurgy
关键词
Q460C
工程机械用钢
抗拉强度
金相组织
终冷温度
冷却速度
Q460C
construction machinery steel
tensile strength
microstructure
final cooling temperature
cooling rate
