Wear-resistant plate smelting process improvement and quality optimization
Wear-resistant plates are important materials for wear-resistant accessories such as excavator buckets, shovel plates, coal mine scrapers, and chutes. At present, when domestic manufacturers produce wear-resistant plates, cracks are more likely to occur during production and subsequent processing, and cracks may occasionally occur during use. Therefore, in order to improve the quality of wear-resistant plates, it is necessary to improve the overall performance of wear-resistant plates by improving the intrinsic quality of smelting molten steel. The original domestic wear-resistant plate smelting process has problems such as long decarburization time, large oxygen consumption, high molten pool temperature, and long residence time at high temperature. Through process improvement and the use of AOD refining furnaces, the quality of molten steel has been improved.
Through process improvement and the use of AOD, scientific researchers based on the "decarburization and chromium preservation" principle of the wear-resistant plate smelting process, combined with the optimization of the AOD smelting process, obtained the composition of high-quality molten steel: ω (C) = 0.02% ~ 0.04%, ω(Si)=0.49%~0.53%, ω(Mn)=0.60%~0.69%, ω(Cr)=12.90%~13.57%, ω(Ni)=3.95%~4.34%, ω(S)≤0.015 %, ω(P)≤0.028%, ω(O)≤80×10-6, ω(N)≤150×10-6, ω(H)≤3×10-6, and make the spherical oxide rating not More than 2.0.
The new process greatly improves the cleanliness of molten steel for wear-resistant plates and meets the requirements of smelting composition and various physical and chemical indicators.
