焦炉上升管换热器内筒用310S不锈钢高温腐蚀行为研究
Research on high-temp.corrosion to 310S stainless steel for inner tube of heat exchanger in standpipe
常红兵 1孔君华 2王志奋 2余卫华 2叶纪康1
作者信息
- 1. 宝钢股份中央研究院炼铁技术研究所(武钢有限技术中心),武汉 430080
- 2. 宝钢股份中央研究院武钢有限技术中心检测所,武汉 430080
- 折叠
摘要
焦炉上升管余热利用作为焦化工序节能减碳、降本增效的重要手段,其换热器内筒材质是关系到上升管安全稳定运行及寿命的关键.选取 310S 耐热钢,在焦炉上升管内进行了 14 天的挂片试验,通过观察挂片前后组织与表面氧化腐蚀情况,得出:310S 钢板经挂片试验后表面出现厚度约 3～5 μm 的氧化层,氧化层含Cr、Fe、O、Si、Al 等元素;且表层有明显的渗氮现象;钢板表层未观察到高温硫化反应现象,也未观察到硫化物腐蚀开裂特征;无明显的组织转变及组织粗化现象,组织中的部分孪晶消失,偏析程度减轻.
Abstract
The utilization of waste heat from the coke oven standpipe plays an important role in energy saving,carbon reduction,cost reduction,and efficiency enhancement in the coking process.The material of the inner tube of the heat exchanger is crucial to the safe and stable operation and service life of the standpipe.310S heat-resistant steel was selected for 14 day hanging test inside coke oven standpipe.By observing the microstructure and surface oxidation and corrosion before and after hanging,the result demonstrated that the surface of 310S steel plate showed a thickness of about 3～5 μm oxidized layer,containing elements such as Cr,Fe,O,Si,Al,etc.;And there is obvious nitriding phenomenon on the surface;No high-temperature vulcanization reaction or sulfide corrosion cracking characteristics were observed on the surface of the steel plate;There is no obvious tissue transformation or coarsening phenomenon,some twinning in the tissue disappears,and the degree of segregation is reduced.
关键词
焦炉上升管/换热器/内筒材料/高温腐蚀Key words
Coke oven standpipe/Heat exchanger/Inner cylinder material/High temperature corrosion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据