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Analysis of the Development of Composite Plate Industry


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Release time:

2023-05-05

【Summary description】Metal composite plates closely combine stainless steel, nickel based alloys, or titanium with alloy steel plates. They not only have excellent anti-corrosion and corrosion resistance properties such as stainless steel and nickel based alloys, but also have good mechanical properties and significant cost advantages of alloy steel. At the same time, they can save precious metals and reduce costs. I personally believe that this is a sunrise industry.

Metal composite plates closely combine stainless steel, nickel based alloys, or titanium with alloy steel plates. They not only have excellent anti-corrosion and corrosion resistance properties such as stainless steel and nickel based alloys, but also have good mechanical properties and significant cost advantages of alloy steel. At the same time, they can save precious metals and reduce costs. I personally believe that this is a sunrise industry.

There are currently two main preparation methods: the first is explosive bonding, which utilizes the instantaneous high temperature, high pressure, and high-speed impact detonation waves generated during the explosion of explosives to achieve solid metallurgical bonding between two or more layers of metals. This is a relatively 'ancient' approach. The second method is the rolling composite method, which keeps the substrate and cladding in a clean state on the surface. Through heating and plastic deformation, the high diffusion effect between atoms is achieved, achieving continuous metallurgical bonding. From the situation of the newly exploded steel plate, its deformation is still quite serious, but relatively speaking, the unevenness of the composite plate rolled by the rolling mill is much better.

In fact, the development history of explosive composite technology can be traced back to World War I, when a military scientist found a bullet exploding on a shovel. As a result, the two metals were combined, which was the first time to find this phenomenon. In 1944, American scientist Carl proposed such a theory, and later conducted an experiment. In 1959, Phoenicia successfully prepared the world's first composite plate. Our country began to study this process in 1963, and successfully developed the first explosive welding experimental plate in 1966, but it was only in 1968 that this process was officially used in industrial production. So, explosive development has a history of more than 60 years, and more than 80 combination methods have been developed, successfully developing composite steel plates such as stainless steel and titanium steel. According to incomplete statistics, the production of explosive composite panels in China last year was about 900000 tons, which is relatively small compared to large categories of panels.

Next, let's introduce the history of rolling composite technology. In the 1950s, the United States was the first to study the theory of rolling composite. In 1955, the former Soviet Union took the lead in researching vacuum rolling technology for the composite between easily oxidized metals. In 1985, JFE Company in Japan merged vacuum electron beam welding with hot rolling to form a relatively mature vacuum rolling method, achieving a vacuum degree of 0.01pa and an interface composite rate of 99%, The shear strength is greater than 210Mpa.

At the beginning of this century, China began to explore this industry. With the expansion of applications in the paper and bridge industries, a breakthrough was made in the entire industry around 2015. However, this is still in the initial stage of development. Currently, the production of hot-rolled flat plates is about 70000 tons, and the production of rolled plates is about 30000 tons. Due to the increasingly high requirements for green, environmentally friendly, and low-carbon production, the rolling composite plate process has a very broad prospect.

Below, I will make a comparison between these two methods. The above picture shows rolling composite, and the following picture shows explosive composite. In terms of rolling composite, the current mainstream method is to use symmetrical billet assembly. In terms of explosive welding, the lower layer is carbon steel, the upper layer is stainless steel, and explosives are laid on the stainless steel, stacked and blasted in this order. Rolling composite can achieve the scale of the entire process, with low environmental pollution, and is not affected by climate. The delivery time is very stable, and the cost of mass production orders is very low. The interface can achieve 100% metallurgical bonding, and the cost is relatively advantageous when the thickness is less than or equal to 40. On the other hand, explosive bonding compensates for its disadvantages. It has a wide variety of composite materials, such as precious metals such as copper and zirconium, with unit prices ranging from tens of thousands to millions, which can be combined with ordinary carbon steel through explosion. Secondly, in terms of thickness, it can break through the limitations of rolling and lamination, and can be achieved with thicknesses of over 100 millimeters and 200 millimeters. The cost of thick plates is relatively lower. Thirdly, it is flexible and suitable for scattered production. Fourthly, it can produce circular heads or irregular parts. The fifth is that the application industry is relatively early and highly recognized, which is a comparison of the advantages and disadvantages of the two.