Cr22合金铸铁溜槽衬板的开发与试验研究

Development and Experimental Research of Cr22 Alloy Cast Iron Chute Liner

介绍了溜槽衬板的使用工况条件及技术要求，研究开发了新型Cr22MoWVTiNbRE钢铁高炉溜槽衬板，其化学成分为：w（C）2．6％～3．2％，w（Si）0．4％-0．8％，w（Mn）0.5％～1．0％，w（Cr）21．0％～23．0％，w（Mo）0．9%-1．1％，w（W）1．1％～1．8％，w（Cu）0．4％。0．6％，w（V）0．3％-0．5％，w（Ti）0．06％-0．2％，w（Nb）0．1％-0．5％，w（RE）0．04％-0．08％，w（S）≤0．06％，w（P）≤0．06％。热处理工艺为980．1050℃淬火＋280-520℃回火，得到的硬度超过63．6HRC，冲击值超过24．66J／em2；450-520℃次回火，金相组织为回火马氏体供晶碳化物（M7C3）＋二次碳化物＋少量残余奥氏体，得到的铸件硬度超过64HRC。

The working conditions and technical requirements of chute liners were introduced. A new kind of chute liner made of Cr22MoWVTiNbRE was researched and developed. Its composition was w（C） 2.6%-3.2%,w（Si） 0.4%~0.8%,w（Mn） 0.5%~1.0%, w（Cr） 21.0%~23.0%,w（Mo） 0.9%-1.1%,w（W） 1.1%~1.8%,w（Cu） 0.4%--0.6%,w（V） 0.3%--0.5%,w（Ti） 0.06%~0.2%,w（Nb） 0.1% -0.5%,w（RE） 0.04%~0.08%,w（S）≤0.06%,w（P）≤0.06%. The heat treatment was quenching at 980~1 050 ℃ ,and tempering at 280-520℃. After heat treatment,the microstrueture hardness and impact value of the casting were above 63.6 HRC and 24.66 J/cm=,respectively. The microstructure after second tempering at 450~520 ℃ was tempered martensite, eutectic carbides （M7C3）, secondary carbides and small amount of residual austenite. Their hardness was above 64 HRC.