超大规格风电用连铸圆坯的氢含量控制  

Hydrogen content control of continuous casting round billets for ultra large scale wind power tower

作　　者：李文博[1,2,3] 郝丽 董诗朋 周胜刚 尹志强 张朝磊 LI Wenbo;HAO Li;DONG Shipeng;ZHOU Shenggang;YIN Zhiqiang;ZHANG Chaolei(Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China;Steelmaking Plant,Chengde Jianlong Special Steel Co.,Ltd.,Chengde 067200,China;Iron and Steel Recycling Technology Research Institute,Liaoning Academy of Materials,Shenyang 110167,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学碳中和研究院,北京100083 [2]承德建龙特殊钢有限公司炼钢厂,河北承德067200 [3]辽宁材料实验室钢铁再生技术研究所,辽宁沈阳110167 [4]北京科技大学材料科学与工程学院,北京100083

出　　处：《炼钢》2024年第4期80-84,90,共6页Steelmaking

摘　　要：针对直径大于等于800 mm的超大规格风电用连铸圆坯因氢含量高出现探伤不合缺陷的问题,通过检测原辅料水分、利用Hydris定氢仪探究全工序钢水氢含量的变化规律。结果表明,铸坯氢含量的主要来源是原辅料水分、炉气气氛潮湿、耐火材料不完全分解。为降低铸坯氢含量,提出了工艺改进措施:转炉吹炼8 min后应不加或加入水分含量较低的原辅料;LF精炼工序投入较少的原辅料;入VD工序前小渣量控制,破空后低速喂线,控制喂线数量及种类在较小范围;小火烘烤连铸中间包60 min,定期清理中间包透气孔。工艺优化后,VD到站钢水w(H)≤3.6×10^(-6),VD离站钢水w(H)≤0.77×10^(-6),连铸中间包首炉钢水w(H)≤2.0×10^(-6),第2炉w(H)≤1.6×10^(-6),连浇炉次w(H)≤1.1×10^(-6),成功降低了超大规格风电用连铸圆坯的氢含量,保证了成品锻件的质量。The defects caused by high hydrogen content were obtained in the flaw detection of ultra large scale continuous casting round billets for wind power tower with a diameter not less than 800 mm.The variation law of hydrogen content in steel throughout the entire process was studied by detecting the moisture content of raw and auxiliary materials and using the Hydris hydrogen analyzer.The results showed that moisture in raw and auxiliary materials,a damp furnace gas atmosphere,and incomplete decomposition of refractory materials are the main sources of hydrogen content in castings.To reduce the hydrogen content of the casting billet,the following process improvement measures were proposed.After 8 minutes of blowing in the converter,raw materials should not be added or added baked one.In the LF refining process,less raw and auxiliary materials are input.Before entering the VD process,a small amount of slag should be controlled.After breaking the vacuum,low-speed wire feeding should be carried out to control the number and type of wire feeding within a small range.Bake the continuous casting tundish at low heat for 60 minutes and clean the air holes in the tundish regularly.After process optimization,the hydrogen mass fraction of molten steel was not exceed 3.6×10^(-6) when arriving at the VD station,and not exceed 0.77×10^(-6) when leaving the VD station.In the molten steel of the continuous casting tundish,the hydrogen mass fraction of the first furnace was not exceed 2.0×10^(-6),and not exceed 1.6×10^(-6) in the second furnace,and not exceed 1.1×10^(-6) in the continuous casting furnace.Therefore,the hydrogen content of the continuous casting round billets for ultra large scale wind power tower was reduced successfully,ensuring the quality of the finished forgings.

关 键 词：氢含量 探伤 连铸圆坯 原辅料 

分 类 号：TF762[冶金工程—钢铁冶金]