The invention relates to a warm rolling method for preparing titanium/steel composite plate
The titanium/steel composite plate composed of titanium plate and steel plate in a layered manner not only has the excellent corrosion resistance of titanium, but also has the advantages of high strength and low cost of steel, and has a wide range of applications in petroleum, chemical industry and shipbuilding. The main preparation methods of titanium/steel composite plate are explosive compounding and hot rolling compounding. Explosive compound method is to use the impact force of the explosion to make titanium plate and steel plate composite together, the process is simple, the prepared titanium/steel composite plate interface bonding strength is high, but this method has some problems such as environmental pollution and difficult continuous production. Hot rolling method is to first treat the surface of titanium plate and steel plate, and then through vacuum electron beam welding or small hole vacuuming method to make the blank to ensure the interface vacuum, and finally multi-pass hot rolling to make titanium plate and steel plate composite. Hot rolling compound method has the advantages of high production efficiency and wide width titanium/steel composite plate, which has gradually become the main method of industrial preparation of titanium/steel composite plate, such as a preparation method of titanium steel composite plate disclosed in patent CN108326516A. Titanium/steel composite plates with high bonding properties were prepared by blank preparation, surface treatment, brushing of spacer, symmetrical assembly, electron beam sealing, heating, rolling, straightening and cutting. For example, a preparation method of titanium steel composite plate disclosed in patent CN107626764A, the titanium billet and billet are surface treated, and then the surface of the titanium billet is painted and dried at room temperature; After surface treatment and coating, the titanium billet is superimposed in pairs, and the billet is placed in the middle, and the billet is symmetrical. Weld and seal all sides of the composite billet, and vacuum treatment; The composite blank is placed in the heating furnace for heat treatment, and then multi-pass rolling. After the rolling is completed, the composite blank is air-cooled, and the edge cutting and tension leveling are carried out to obtain the titanium/steel composite plate. The above two patents require titanium/steel billet welding vacuum treatment and hot rolling. However, this method requires vacuum electron beam welding, which requires high equipment and complicated process.
The cold rolling method is to pretreat the surface of the plate first, and then roll at room temperature to achieve the interface pre-composite, and finally diffusion heat treatment to achieve the interface metallurgical bonding. The method is not only simple in process, low in equipment requirements, but also has high production efficiency and no pollution to the environment, and is especially suitable for preparing metal composite plates with low strength such as copper and aluminum. Because of the high strength of titanium and steel, the cold rolling composite method of titanium/steel composite plate is difficult to prepare wide titanium/steel composite plate because of the high load of the rolling mill.
Cold-rolled composite plate preparation process:
1. First of all, the titanium plate and steel plate are annealed to achieve the softest state, so that the hardness of the titanium plate is < 150HV, the hardness of the steel plate is < 130HV, and the titanium plate material is pure titanium, the model is TA1, TA2, TA3 or TA10; The steel plate material is low carbon steel, the model is Q235, Q275 or 20#, and the initial thickness of the titanium plate is 0.5-3.0mm; The initial thickness of the steel plate is 1.0-6.0mm;
2, followed by the grinding wheel or diamond grinding wheel along the width of the plate mechanical grinding titanium plate and steel plate to composite surface, to obtain clean and rough composite surface, composite surface roughness Ra is 4 ~ 10μm;
3, and then the titanium plate and steel plate layer after the billet is covered with metal foil;
4, then put the billet in the heating furnace at 100-400℃ insulation 10-40min;
5, and then a single pass warm rolling to titanium/steel interface composite, rolling pressure is 30% - 60%, rolling speed of 0.1-0.6m/s;
6. Finally, the titanium/steel composite plate is placed in the heating furnace at 500‑800 ° C for 20‑60min diffusion heat treatment, so that the interface can achieve metallurgical bonding.
The process of annealing, surface treatment and warm rolling can reduce the load of the mill, and the interface does not need vacuum treatment. It has the advantages of low equipment requirements, simple process and easy industrialization.
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