LCLA工艺Q345E耐低温H型钢开发生产实践
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摘要
针对Q345E耐低温H型钢性能波动和产品表面质量差的问题,结合实际生产工艺条件,采用LCLA工艺生产,经过优化工业试验,并对产品进行金相、SEM、TEM及性能检验分析,结果表明,LCLA工艺设计完全满足H型钢Q345E级别产品性能指标要求,产品性能随终轧温度降低提升,随Nb合金含量增加,钢中第二相析出量细化组织的效果明显;产品力学性能指标波动更小,数值离散度减小;表面质量提升。
Aiming at the problem that performance fluctuation and poor surface quality of Q345E low-temperature H section,LCLA process was adopted to produce Q345E combined with the actual production process conditions.The product was analyzed by metallurgical microscope,SEM,TEM and performance inspection and analysis after optimizing the industrial test.The results show that LCLA process design completely satisfies the requirements of performance index for Q345E H section.The performance of product was improved with the decreasing of the finishing temperature and the effect of second phase precipitation on grain refining is obvious with the addition of Nb,the mechanical property index volatility was smaller and the numerical discrete degree was reduced.The surface quality was improved.
Aiming at the problem that performance fluctuation and poor surface quality of Q345E low-temperature H section,LCLA process was adopted to produce Q345E combined with the actual production process conditions.The product was analyzed by metallurgical microscope,SEM,TEM and performance inspection and analysis after optimizing the industrial test.The results show that LCLA process design completely satisfies the requirements of performance index for Q345E H section.The performance of product was improved with the decreasing of the finishing temperature and the effect of second phase precipitation on grain refining is obvious with the addition of Nb,the mechanical property index volatility was smaller and the numerical discrete degree was reduced.The surface quality was improved.
引文
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[3]侯华兴,杨颖,张哲,等.HTP技术在高强度特厚板生产中的应用[J].钢铁,2012,47(2):53-57.
[4]缪成亮,尚成嘉,曹建平,等.HTP X80管线钢的晶粒细化与组织控制[J].钢铁,2009,44(3):62-66.
[2]S.Shanmugam,N.K.Ramisetti,R.D.K.Misra,et al.Effect of cooling rate on the microstructure and mechanical properties of Nb-microalloyed steels[J].Materials Science and Engineering,2007,A 460-461:335-343.
[3]侯华兴,杨颖,张哲,等.HTP技术在高强度特厚板生产中的应用[J].钢铁,2012,47(2):53-57.
[4]缪成亮,尚成嘉,曹建平,等.HTP X80管线钢的晶粒细化与组织控制[J].钢铁,2009,44(3):62-66.