Scientific researchers have developed a method for preparing double-coated wear-resistant plates, which specifically includes the following steps:
(1) Select a defect-free double-clad explosive composite wear-resistant slab, with the upper and lower layers made of titanium plates and the middle layer made of steel plates;
(2) Treat the surface of the selected composite wear-resistant slab;
(3) Place the surface-cleaned composite wear-resistant plate blank into a stepping heating furnace for heating, focusing on controlling the flame length of the furnace burner;
(4) Send the composite wear-resistant slab after soaking to the rolling mill for descaling and perform multi-pass rolling;
(5) After the rolling is completed, the wear-resistant plate is air-cooled and straightened. By controlling the flame length of the furnace burner, the present invention prevents the flame from being too long to contact the wear-resistant plate and cause it to be burned, prevents the generation of intermetallic compounds at the interface between titanium and steel, and facilitates the control of plate shape in the subsequent rolling process. , greatly reducing the degree of titanium layer thinning. The double-clad wear-resistant plate rolled by the present invention has good plate shape, uniform size and excellent performance.
The preparation method of this double-clad wear-resistant plate is characterized by: including the following steps:
Ⅰ. Preparation of raw materials: Select a double-clad wear-resistant slab. The upper and lower cladding layers of the selected blank are titanium plates, and the middle layer is a steel plate; the steel plate and one of the titanium plates are explosively compounded into a single-clad wear-resistant slab. Grinding slab, the single-coated wear-resistant slab and another layer of titanium plate are combined into a double-coated wear-resistant slab through secondary explosion;
Ⅱ. Surface treatment: Surface treatment is performed on the selected wear-resistant plate blank to remove impurities on the upper and lower surfaces of the composite blank and burrs around the blank;
Ⅲ. Heating treatment: The cleaned composite blank is loaded with steel from the end of the furnace, placed in a walking heating furnace for heating, and enters the preheating section, heating section, and soaking section in sequence. The temperature of the preheating section is ≤550°C. Preheating time ≥50min; heating section temperature is 750~950℃, heating speed ≤300℃/h; soaking section temperature is 830~920℃, soaking time is 60~150min;
IV. Descaling rolling: The composite billet after soaking is sent to the rolling mill for descaling, and 5 to 13 passes of rolling are performed. The reduction rate of the first rolling pass is controlled to be >20%, and the reduction rate of the last pass is <10 %, the total reduction rate is 60%~90%, and the wear-resistant plate is air-cooled after rolling;
Ⅴ. Straightening treatment: The wear-resistant plate is straightened after air cooling. Place the wear-resistant plate to be straightened in the straightening machine. Determine the straightening pass according to the thickness of the wear-resistant plate, and check the outlet edge of the straightening machine. The rollers set various parameters so that the wear-resistant plate to be straightened passes through the straightening machine evenly; the straightening temperature is ≥600°C, and the number of straightening passes is at least 1.
