The surface quality of 304 stainless steel plate is mainly determined by the pickling process after heat treatment. If the surface oxide scale formed by the previous heat treatment process is thick or the structure is uneven, pickling cannot improve the surface finish and uniformity. Therefore, full attention should be paid to the heating of heat treatment or the surface cleaning before heat treatment. If the thickness of the oxide scale on the surface of the stainless steel plate is not uniform, the surface finish of the base metal under the thick part and the thin part will also be different. Therefore, the surface of the steel plate is not uniform. Therefore, it is necessary to uniformly form oxide scales during heat treatment. To meet this requirement, the following issues must be noted: If the stainless steel plate has oil attached to the surface of the workpiece during heating, the thickness and composition of the oxide scale at the oil-attached part will be different from the thickness and composition of the oxide scale in other parts, and carburization will occur. The carburized part of the base metal under the oxide scale will be severely attacked by the acid. The oil...
In the category of stainless steel pipes and fittings, there are many types of stainless steel pipes, including 201, 301, 304, 316, 316L, 2205, and 904L… and other stainless steel pipes. Pipes of different materials have different corrosion resistance. What is the difference between 904L duplex stainless steel and austenitic stainless steel? Many people expressed their curiosity. In response to this problem, the editor of Jude has compiled some relevant materials for everyone to improve: Let’s talk about the advantages of 904L duplex stainless steel pipe: 1. The yield strength is more than double that of ordinary austenitic stainless steel, and it has sufficient plasticity and toughness for forming requirements. The wall thickness of storage tanks or pressure vessels made of duplex stainless steel is 30-50% lower than that of commonly used austenite, which is conducive to reducing costs. 2. It has excellent resistance to stress corrosion cracking. Even the duplex stainless steel with the lowest alloy content has a higher resistance to stress corrosion cracking than austenitic stainless steel, especially in an environment containing chloride ions. Stress corrosion is a prominent problem that is difficult for ordinary austenitic stainless steels to deal with. 3. The corrosion resistance of the...
430 stainless steel, known as “stainless iron” in our stainless steel industry, has good corrosion resistance and better thermal conductivity than austenitic stainless steel. Currently, it is mainly used in architectural decoration, local home appliance parts, fuel burners Parts and other scenarios at room temperature or high temperature. However, since the chromium content in 430 stainless steel is much less than that of 304, it is not as good as 304 in terms of hardness. However, 430 stainless steel is not food-grade stainless steel at all, and most of the time, stainless steel is made of recycled scrap iron, steel, lead and other materials through secondary processing and a series of treatments. 430 stainless steel and 304 stainless steel ≠ food grade stainless steel, as long as it conforms to the national GB9684 standard certification and can really come into contact with food without causing physical harm, it belongs to food grade stainless steel. Orthodox manufacturers usually use 304 (ie 18-8) and 430 (ie 18-0) stainless steel as forks and spoons. 430 is magnetic, 304 is micromagnetic. Therefore, when purchasing stainless steel tableware, you can easily identify it with a magnet. Food stainless steel products are divided into two categories...
Stainless steel tableware is a product that is often used in everyone’s life. Many people often hear the title codes for stainless steel such as 304 and 430, but they don’t quite understand the meaning of these codes. Indeed, these codes do not intuitively represent various types of stainless steel products. For detailed information, in practice, there is a digital representation that can better reflect product information, that is, the chromium-nickel content. For example, 18-8 (that is, the 304 model) represents that the stainless steel material contains 18% chromium and 8% nickel, of which chromium Anti-oxidation and rust, nickel is anti-corrosion of chemical media, and iron is of course the foundation of stainless steel. The following digital methods are used to illustrate the difference between various stainless steel tableware. 1. 430 (18-0) stainless steel: when the chromium content in stainless steel reaches more than 12%, it can well avoid oxidation and rust caused by the natural environment, and 403 stainless steel tableware with a chromium content of 18% is a more reasonable ratio. Anti-rust products, but because this model does not contain nickel, the ability to resist chemical medium corrosion is relatively weak, so 430 stainless steel is mostly used...
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