Hydrogen gas reduction of oxide scale of hot rolled steel after cold rolling
A hot-rolled steel strip MRT-4CA with black oxide scale was employed to study cold deformation behavior of the steel and the reduction of the oxide scale when annealing in atmosphere containing H2. The reduction state of the oxide scale after annealing at 750 ℃ in 10% H2atmosphere for 180 s was also studied by optical microscope and X-ray diffraction. The results show that the deformation of the scale can occur with the hot rolled substrate simultaneously and the cracks form in the scale after cold rolling, which accelerates the reduction of the scale during annealing treatment. X-ray diffraction tests indicate that the major components of the samples surface are Fe and FeO after annealing. When the reduction ratio of cold rolling reaches 55% , the maximum value of mass loss is observed and further increasing of reduction ratio of cold rolling decreases the mass loss.
acid-free picklinghydrogen gas reductioncold rollingscale
NETL
NSTL
万方数据
维普
