1. Aluminum and aluminum alloy sheets and strips are supplied in hot-rolled state, annealed state, various levels of soft state and various heat-treated states.
2. Preparation before hot rolling Mainly include ingot quality inspection, soaking, sawing, milling, aluminum clad and heating.
3. The cooling rate is very high during semi-continuous casting, the diffusion process in the solid phase is difficult, and the chemical composition and uneven structure of the ingot are easy to form, such as intracrystalline segregation, which reduces the plasticity.
4. When there are defects such as segregation floats, slag inclusions, scars and cracks on the surface of the ingot, milling should be performed (see Milled surface of non-ferrous metal alloy ingot blanks), which is an important factor to ensure good surface quality of the finished product.
5. Hot rolling: The hot rolling of aluminum alloy ingots is to provide blanks for cold rolling, or to directly produce thick plates in the hot rolled state.
6. Hot rolling process system includes pass reduction rate, rolling temperature, rolling speed, lubrication and cooling, etc.