处在潮湿多雨地区的工厂,由于保管不善,一些碳钢的板材和棒材锈蚀较严重。当这些钢材下料成毛坯件后,往往需调质处理。但这些毛坯件在淬火加热过程中,表面锈蚀层形成一层较坚固的氧化皮,在冷却时降低了冷却速度,经回火后毛坯组织为片状珠光体,综合力学性能达不到调质的要求, Factories in humid and wet areas, due to poor storage, some of the carbon steel plate and bar rust more serious. When these steel blanks into blanks, often need to quenched and tempered. However, these rough parts in the quenching process, the surface rust layer to form a layer of more solid oxide scale, reducing the cooling rate during cooling, after tempering the blank is flaky pearlite, the comprehensive mechanical properties of less than quenched and tempered The request,