If the temperature in the environment exceeds the limit that the pipeline can withstand, the pipeline will slowly melt, which will not only affect the normal operation of other components, but also make the function provided by the pipeline disappear. In the past, it was difficult to find a pipe that could meet such requirements, for example, in some boilers and combustion chambers, the pipeline system is required to transport fuel to them. Once the temperature in the environment reaches almost the limit of the pipeline, the performance of the pipeline will be greatly reduced.
But now, the problem has been completely solved with the emergence of seamless pipe steel. There are no additional requirements for the use of seamless steel pipe, as the pipes undergo multiple rolling during production, making the pipes themselves very stable and not affected by changes in environmental temperature. This is one of the most important reasons why seamless pipe steel replaces ordinary steel pipes. Compared with pipes made of other materials, steel pipe wholesale has certain advantages in terms of hardness and compressive strength. However, just a few years ago, many industries that use pipeline systems did not use steel pipes as the main pipe material.
First of all, We have custom seamless steel pipe for sale, for different purposes have different temperature requirements. For example, seamless steel pipe for ships is used to manufacture Class I pressure piping systems, Class II pressure piping systems, boilers, and superheaters. The working temperature of the carbon steel seamless pipe wall is not more than 450℃, and the working temperature of the alloy steel seamless pipe wall is not more than 450℃; 30ma high-quality carbon structural steel and alloy steel seamless pipe steel are used for chemical equipment and pipelines.
Secondly, there are regulations on the temperature resistance performance of seamless steel pipe. For example, the steel pipe of GB/T8163 standard is suitable for pipelines with a design temperature of less than 350℃ and a pressure of less than 10.0MPa; when the pipeline medium is oil, oil, and gas, GB9948 should be selected when the design temperature exceeds 350℃ or the pressure is greater than 10.0MPa. Or seamless alloy steel pipes of GB6479 standard; for pipelines operating near hydrogen, or in environments prone to stress corrosion cracking, GB9948 or GB6479 standards should be used. CS seamless pipes for low temperature use (below -20℃) should adopt the GB6479 standard, which only specifies the low temperature impact toughness requirements of the material.
In fact, the use temperature of seamless pipe steel should not be kept in the middle of 450 to 860℃. When the temperature of seamless steel pipe reaches 450℃, the zero boundary point will appear. At this zero boundary point, the diluent of stainless steel plate is carbon. The chromium element around the element will produce chromium carbide, and the chromium in the diluent will appear in the originally existing area. The appearance of the chromium-poor area will change the material properties of stainless steel. In addition, the temperature of 450℃ increases the influence of the transformation of martensite to austenite.