1. Product description
Aluminum clad steel plates by cold rolling is a composite material made of aluminum and steel with different physical, chemical and mechanical properties at the interface by using composite technology. It can greatly improve the performance of single metal materials, and has been used in power plants, household appliances and other fields in recent years. The main production methods of aluminum steel composite plate include explosive welding, hot dip aluminum plating and rolling composite. In this paper, aluminum steel composite plate is prepared by cold rolling composite at room temperature, which has good product surface quality, high dimensional accuracy, environmental protection in the production process, uniform performance, good consistency, even thickness ratio of aluminum layer to steel layer, and easy to achieve mass production.
2. Product Features
After cold rolling, laminating and annealing at 520 ℃ for 24 hours, the strength and plasticity of the 4A60/08Al composite plate decrease, the cupping value increases from 7.68 mm to 10.75 mm, the elongation increases from 1% to 42.5%, the tensile strength decreases from 705 MPa to 315 MPa, the yield strength decreases from 500 MPa to 260 MPa, and the hardness decreases from 213.3 HV0.5 to 93.5 HV0.5. 2) After annealing treatment, aluminum steel composite plates are metallurgically bonded at the interface. After being annealed at 520 ℃ for 24 hours, complete recrystallization occurs, and no iron aluminum binary brittle phase is produced at the aluminum steel interface. Therefore, it is determined that 520 ℃ for 24 hours is the best annealing process under this rolling system.
3. Application of clad plate
As a decorative material, steel is durable, bright and requires little surface maintenance, so it can be greatly reduced.
For example, the corridor wall of the World Trade Center in New York, USA, is made of large steel products; Aluminum is light, its surface can be oxidized and colored, and it is easy to process. Combining these two metals into a new material not only greatly reduces the decoration cost, reduces the difficulty of the decoration process, but also is more safe and reasonable.
4. FAQ
The method of "cold rolling compound+temper rolling+annealing" is adopted for the compound rolling of Aluminum clad steel plates by cold rolling. The microstructure changes were observed by optical microscope and scanning electron microscope, and the mechanical properties of the composite plate were determined by microhardness, tensile test and cupping test. The results show that the microstructure of 08Al steel layer after rolling and laminating is fibrous distribution along the rolling direction. After annealing at 520 ℃ for 24 hours, 08Al steel layer undergoes complete recrystallization, no Fe2Al5 binary brittle phase is produced at the interface between aluminum and steel, the strength of composite plate decreases, the plasticity increases, the hardness decreases, and the mechanical properties reach
According to the operation requirements, the best annealing process for the composite plate under the rolling system is determined to be 520 ℃ for 24h.
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