The 304 stainless steel seamless pipe is to make the molten metal react with the iron matrix to form an alloy layer, so that the matrix and the coating are combined. Certain rules must be followed during use, and irregular operations will also lead to finished products of stainless steel welded pipes. rate drops. The protective gas is Ar gas with a purity of 99.99%. When the welding current is 50~50A, the Ar gas flow rate is 8~0L/min. When the current is 50~250A, the Ar gas flow rate of 304 stainless steel seamless pipe is 2~5L /min. Because 304 stainless steel seamless pipes are used in a wide range of industries, it is involved in many industries, so it is necessary to do a good job in its own operation and management during processing. One of the important steps is the treatment of pickling and passivation of 304 stainless steel seamless pipes. , It cannot be used directly without pickling passivation. Let’s talk about the importance of pickling passivation for 304 stainless steel seamless pipes. Stainless steel pipe manufacturers 304 stainless steel seamless pipe workpieces will form an oxide film when placed in the air, but the protection of this...
As long as it is a material, it has a service life. In the process of use, it will be directly or indirectly damaged more or less. There are many kinds of damage to materials. Among them, corrosion is the most common form of damage. The damage phenomenon caused by the chemical, electrochemical and physical effects of materials in environmental media is called corrosion, especially commonly used metal materials. Corrosion problems involve all areas of life, and corrosion problems are inevitable as long as materials are used. Corrosion will not only cause some accidents, but also bring huge economic losses. According to statistics, 10% to 20% of metals are lost due to corrosion every year. If 1 billion tons of steel are produced annually, it means that 100 million tons of steel are wasted due to corrosion. Therefore, how to prevent corrosion is an urgent problem. The most basic ways to protect against corrosion are usually the following six: (1) Improve the corrosion resistance of the material itself; (2) Change the environment: (3) Use coating and surface modification; (4) Separate the material from the corrosive medium: (5) Use electrochemical protection; (6) Correct material selection and reasonable design. Ferritic stainless steels...
In order to improve the surface quality of stainless steel pipes, that is, to reduce the energy level and reduce the number of interlayers by improving the surface morphology and morphological structure, we make stainless steel pipes that meet customer requirements. The most common surface treatment methods are as follows: AP/CP: Pickling or passivation (Pickled & Passivated/Chemically Polished) The pipes are pickled or passivated, which will not increase the surface roughness, but will remove the remaining particles on the surface and reduce the energy level, but will not reduce the number of interlayers. AP is pickling treatment, which uses acidic solutions such as nitric acid and fluorinous acid to remove the oxide layer of steel pipes. Cheap and fast, but it is easy to cause grain boundary corrosion and the inner and outer surfaces are rough and easy to have suspended impurities attached. MP: Mechanical polishing is commonly used for oxide layers, holes and scratches on the surface of steel pipes. The brightness and effect depend on the type of processing. Also after mechanical polishing. Although it is more beautiful, it will also reduce the corrosion resistance, so it needs to be passivated when used in a corrosive environment. Moreover,...
The basic design idea when preparing nano-silver on the surface of stainless steel is to make nano-silver exist stably, uniformly and for a long time. Due to the poor binding force between nano-silver and stainless steel, it is difficult to exist stably on the surface of stainless steel alone. On the surface of stainless steel, according to previous studies, the carrier is usually holes, inorganic coatings, etc., combined with the preparation method of nano-silver and the preparation method of antibacterial stainless steel, it is found that electrochemical method and sol-gel method can be used to load nano-silver on the surface of stainless steel. (1) Electrodeposition method The traditional electrodeposition method to prepare nano-silver is to directly deposit silver on the cathode, and then peel off the metal powder of the cathode. The prepared powder has the advantages of high purity, large specific surface area, controllable powder particle size, and automatic production. Widely used in the preparation of nano-silver powder. However, this method can only be used to prepare powder, and cannot directly and stably prepare nano-silver on the surface of stainless steel. The nano-silver preparation method selected in this paper is to use pulse electrodeposition technology to prepare nano-scale silver...
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