Thin Oxide Film Growth during Final Annealing of Stainless Steels

After the cold rolling sequence of the production line,stainless steels strips present highly disordered structure and have to be annealed to recover their crystalline structure.This operation takes place by passing the moving strip through a furnace heated by combustion of natural gas with little air excess.Although the time at high temperature is short(<1 min),the formed surface oxide is thick enough to modify the surface aspect of the steel,making necessary subsequent chemical pickling.The present work explores the oxidation step of various stainless steels during final annealing in order to better understand the mechanisms involved and make further improvements in the pickling sequence.

激光表面改性和离子表面改性

本文介绍了激光和离子处理对金属材料热氧化、热硫化的影响,分别讨论和比较了激光和离子处理的优缺点。通过实例阐明各种处理的作用机理及存在的问题。离子处理可显著提高金属抗热氧化、热硫化的性能。离子沉积涂镀技术已达实用阶段;激光处理可得到很厚的镀层,具有很大的实用价值。