Discussion on the cleanliness and production issues of S355J2W(H) steel by magnesium treatment
GAO Yan1, ZHANG Hao2, FU Jianxun2, SHEN Ping*2
1. Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,China; 2. Center for Advanced Solidification TechnologyCAST, State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering, Shanghai University,Shanghai 200444,China
Abstract：The magnesium treatment technology was adopted for the production of S355J2W(H) steel in one factory. The modification effect of inclusions was not stable,and the improvement in product quality and performance was not obvious.Therefore,the process sample and casting slab sample in the magnesium treatment of S355J2W(H) steel were analyzed.The size,morphology,composition,and distribution of inclusions in steel were detected by optical microscope,scanning electron microscope(SEM) and three-dimensional etching technology for inclusions.The cleanliness level at different positions of casting slab were determined.The transition rule and critical transition condition of inclusions in the process of magnesium treatment were obtained by thermodynamic calculation.The causes for the problems were found out.The results showed that among different positions in the casting slab,the size of inclusions at 1/4 of inner arc and center of casting slab was maximum.Meanwhile,the area proportion was also maximum,which conformed to the distribution rule of general inclusions in the casting slab. However,the composition and type of oxide inclusions had diversity.The casting slab contained CaO-Al2O3,CaO-MgO-Al2O3,MgO·Al2O3 and MgO simultaneously.The modification was uneven due to the various types of inclusions.Low content and nonuniform distribution of Mg in steel was the main reason to cause such issue.
高燕, 张浩, 付建勋, 沈平. S355J2W(H)钢镁处理洁净度及生产问题解析[J]. 冶金分析, 2024, 44(1): 26-34.
GAO Yan, ZHANG Hao, FU Jianxun, SHEN Ping. Discussion on the cleanliness and production issues of S355J2W(H) steel by magnesium treatment. , 2024, 44(1): 26-34.
[1] 李春来,潘雪新,郭继祥,等.带状组织对S355J2W(H)耐候钢板冲击性能的影响[J].热加工工艺,2021,50(6):46-49. LI Chunlai,PAN Xuexin,GUO Jixiang,et al.Influence of banded structure on impact toughness of S355J2W(H) weathering steel plate[J]. Hot Working Technology,2021,50(6):46-49. [2] 姜海昌,封辉,潘雪新,等.热处理温度对S355J2W耐候钢板组织和性能的影响[J].金属热处理,2018,43(6):122-125. JIANG Haichang,FENG Hui,PAN Xuexin,et al.Effect of heat treatment temperature on microstructure and properties of S355J2W weathering resistant steel plate[J].Heat Treatment of Metals,2018,43(6):122-125. [3] 李恒奎,马利军,李晓燕,等.动车组转向架构架板材耐候性分析[J].腐蚀科学与防护技术,2014,26(1):8-12. LI Hengkui,MA Lijun,LI Xiaoyan,et al.Weather-resistance of two structural steels for frame of CRH electric multiple unit[J].Corrosion Science and Protection Technology,2014,26(1):8-12. [4] 孙丹丹,万卫浩,韩冰,等.SMA490BW耐候钢中析出相和夹杂物的定量统计分析[J].冶金分析,2020,40(8):1-7. SUN Dandan,WAN Weihao,HAN Bing,et al.Quantitative and statistical analysis of precipitation phases and inclusions in SMA490BW weathering resistant steel[J].Metallurgical Analysis,2020,40(8):1-7. [5] 陈佳荣,赵新娥,刘国永,等.试样尺寸对S355J2W钢冲击试验结果的影响[J].热处理,2020,35(6):19-24. CHEN Jiarong,ZHAO Xin'e,LIU Guoyong,et al.Effect of sample size on impact test results of S355J2W steel[J].Heat Treatment,2020,35(6):19-24. [6] 王博,李铸铁,战东平,等.高氮耐候钢锈层的电化学与物相表征[J].冶金分析,2018,38(4):11-15. WANG Bo,LI Zhutie,ZHAN Dongping,et al.Electrochemical and phase characterization of rust layer on high nitrogen weathering steel[J].Metallurgical Analysis,2018,38(4):11-15. [7] Zhen S,Duan Z,Sun D,et al.Study on microstructures and mechanical properties of laser-arc hybrid welded S355J2W+N steel[J].Optics & Laser Technology,2014,59:11-18. [8] 何广忠,吴越,梁继业,等.S355J2W钢转向架盖板自阻加热成形工艺研究[J].塑性工程学报,2020,27(2):29-36. HE Guangzhong,WU Yue,LIANG Jiye,et al.Research on self-resistance heating forming process of S355J2W steel bogie cover[J].Journal of Plasticity Engineering,2020,27(2):29-36. [9] 栾文林,刘志远,赵定国.耐候钢S355J2W的研发和工艺实践[J].特殊钢,2014,35(1):43-45. LUAN Wenlin,LIU Zhiyuan,ZHAO Dingguo.Development and process practice of weathering steel S355J2W[J].Special Steel,2014,35(1):43-45. [10] Shen P,Fu J.Morphology study on inclusion modifications using Mg-Ca treatment in resulfurized special steel[J].Materials,2019,12(2):197. [11] 张浩,刘年富,胡芳忠,等.镁对20MnCr5齿轮钢中夹杂物的改质研究[J].钢铁研究学报,2021,33(8):775-783. ZHANG Hao,LIU Nianfu,HU Fangzhong,et al.Study on modification of inclusions by Mg in 20MnCr5 gear steel[J].Journal of Iron and Steel Research,2021,33(8):775-783. [12] 王攀峰,付建勋,沈平.镁处理对1215易切削钢中夹杂物的影响[J].钢铁,2022,57(6):72-81. WANG Panfeng,FU Jianxun,SHEN Ping.Effect of magnesium treatment on inclusions in 1215 free-cutting steel[J].Iron and Steel,2022,57(6):72-81. [13] 艾克南,谢剑波,曾志崎,等.镁对非调质钢中组织及硫化物的影响[J].钢铁研究学报,2019,31(4):361-367. AI Kenan,XIE Jianbo,ZENG Zhiqi,et al.Effect of Mg on microstructure and sulfide in non-quenched and tempered steel[J].Journal of Iron and Steel Research,2019,31(4):361-367. [14] Zhang T,Min Y,Liu C,et al.Effect of Mg addition on the evolution of inclusions in Al-Ca deoxidized melts[J].ISIJ International,2015,55(8):1541-1548. [15] Ogibayashi S.Advances in technology of oxide metallurgy[J].Nippon Steel Technical Report,1994(61):70-76. [16] Wang L,Yang S,Li J,et al.Effect of Mg addition on the refinement and homogenized distribution of inclusions in steel with different Al contents[J].Metallurgical and Materials Transactions B,2017,48(2):805-818. [17] 李新明,郑少波,郑庆,等.钢的氧化物冶金技术[J].上海金属,2005,25(5):55-60. LI Xinming,ZHENG Shaobo,ZHENG Qing,et al.Oxides metallurgy[J].Shanghai Metals,2005,25(5):55-60. [18] 徐龙云.镁脱氧钢中夹杂物特性及大线能量焊接性能研究[D].长沙:中南大学,2014. [19] Zhang D,Shen P,Xie J,et al.A method for observing tridimensional morphology of sulfide inclusions by non-aqueous solution electrolytic etching[J].Journal of Iron and Steel Research,International,2019,26(3):275-284.
