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Stainless steel is the abbreviation of stainless and acid-resistant steel. Steels that are resistant to weak corrosive media such as air, steam, and water or are stainless steel are called stainless steels; while those that are resistant to chemical corrosion The steel grade is called acid-resistant steel. Due to the difference in chemical composition between the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical media corrosion, while acid-resistant steel is generally non-corrosive. The term "stainless steel" not only refers to a single type of stainless steel, but also refers to more than one hundred industrial stainless steels. Each stainless steel developed has good performance in its specific application field. The key to success is to understand the purpose first, and then determine the correct steel grade. There are usually only six steel grades related to the application of building construction. They all contain 17-22% chromium, and better steel grades also contain nickel. The addition of molybdenum can further improve the atmospheric corrosion, especially the corrosion resistance of the chloride-containing atmosphere.
What is the effect of rapid cooling and final cooling on the temperature of stainless steel after rolling? ? How much do you know about this problem?
The effect of rapid cooling and final cooling on temperature of stainless steel after rolling
The final cooling temperature is a very important control index in the control cooling. It is a function of equipment cooling capacity, length of cooling zone, and moving speed of rolling stock. In the adopted through-type cooling equipment, when the size and cooling time are unchanged, the final cooling temperature reflects the size of the cooling rate, and indirectly reflects the type and quantity of the phase change products of the rolling. In the air cooling after the rapid cooling stops, the tempering temperature of the steel itself has an effect on the strength of bainite and martensite, and the tempering temperature is directly related to the final cooling temperature.
Too high final cooling temperature indicates insufficient cooling capacity of the equipment. It is caused by insufficient cooling speed or insufficient cooling time. Therefore, the structure of the rolled product has not been sufficiently refined and does not meet the purpose of controlled cooling. Conversely, too low final cooling temperature indicates excessive cooling of the rolled material, which may produce some low-temperature transformation products in the rolled material, resulting in deterioration of material toughness.
Therefore, in order to maintain the uniformity of the performance of the rolled material in the length direction, the final cooling temperature of the rolled material must be kept the same over the entire length. Under normal circumstances, the final rolling temperature of the head and tail section of the rolling piece is relatively low, which leads to a drop in the opening cooling temperature and the final cooling temperature. In order to reduce the temperature difference between the head and tail of the steel plate in production, the method of adjusting the water flow with the rapid opening and closing of the valve according to the position of the steel plate on the roller table is adopted.
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