At present, the main production methods of
stainless steel clad plate at home and abroad include solid-liquid phase bonding method and solid-phase bonding method. The solid-phase bonding method mentioned is explosive welding and explosive welding billet rolling. Because the explosive welding interface presents a waveform, which is not the same as the interface presented by the direct rolling compound, so whether it has such a waveform interface becomes an important sign of good or good welding. The industry has concluded through long-term observation and testing that there are three main interface bonding forms of explosive composites: direct bonding between metals; wavy bonding at the interface; uniform and continuous melting layer between metals. In the whole production process of stainless steel clad plate, heat treatment becomes a very critical part. The strength and hardness of the clad steel plate after explosion welding increase, and the plasticity decreases, which is not conducive to the subsequent processing and use. The main purpose of the heat treatment process is to eliminate the internal stress after the explosion composite and improve the plasticity of the stainless steel composite plate. Since the solution treatment system of general stainless steel is very different from that of carbon steel, the temperature of heat treatment, the time of heat preservation and the choice of cooling system have become extremely important factors.
The stainless steel clad plate has obvious periodic ups and downs. The market as a whole shows a repeated upward trend of fluctuations; especially in the steel charge market, the stainless steel clad plate has very obvious periodic ups and downs. After entering July, the prices of imported iron ore, billets and other major raw materials continued to rebound. The analysis believes that the fear of "money shortage" in banks has gradually disappeared, the tension of funds has been eased, the market and stock market have rebounded, and spot steel prices have stabilized and rebounded. The main driving force for the staged rise of the charge market. In recent days, the domestic steel charge market has performed well, and the prices of some varieties have continued to rise. Among them, the increase in the external mines is significantly stronger than that of the internal mines. The pessimistic atmosphere in the early stage has begun to fade. The market believes that the current domestic steel mills are more enthusiastic about production. Most of the iron ore raw material inventories of steel mills are at a historically low level, and there is a need to continue to replenish inventories. In addition, inventories in the raw material market have dropped sharply, and the contradiction between supply and demand has eased, which is conducive to a rebound in prices.
The common welding process of stainless steel clad plate has now appeared a large pressure storage tank made of stainless steel clad plate. The electric welding includes the electric welding of the bottom layer, the electric welding of the multi-layer, and the electric welding of the composite layer, and the electric welding of the multi-layer during the period belongs to different electric welding. The bottom layer is a common stainless steel plate for high-pressure vessels, with outstanding weldability and usually no difficulty factor, which can meet the mechanical cost-effectiveness standard of composite steel for hardness, rigidity, and characteristics; the composite layer is ferritic stainless steel, which has good wear resistance. The selection of suitable welding materials and welding techniques can prevent thermal cracks and meet the standard of corrosion resistance of cladding during operation.
