Laboratory studies on the coiling temperature of ultra-low carbon deep drawing steel

The effects of coiling temperature on the microstructure and nano-scaled precipitates of ultra-low carbon steel with deep drawability, together with the corresponding textures of the annealed cold-rolled sheet, were investigated by Gleeble-1500 hot simulator, X-ray diffraction, optical microscopy and transmission electron microscope. It is found that nano-scaled precipitates in the hotrolled steel sheet are mainly CuS and CuS-MnS. The precipitates are less, coarse, and sparse when the coiling temperature is lower. To obtain a strong favorable texture and a better drawing property, the best coiling temperature should be under 600℃.