Adaptive Temperature of Seamless Tube

Generally speaking, the use temperature of seamless tubes is 190°C~860°C, but in the actual use process, the use temperature of seamless steel tubes cannot reach as high as 860°C.

What temperature is the seamless steel tube suitable for?

First of all, seamless steel tubes for different purposes have different temperature requirements. For example, the seamless steel tube for ships is the seamless steel tube for the manufacture of class I pressure-resistant piping systems, class II pressure-resistant piping systems, boilers and superheaters. The working temperature of the carbon steel seamless tube wall does not exceed 450 °C, and the working temperature of the alloy steel seamless tube wall exceeds 450 °C; 30ma of high-quality carbon structural steel and alloy steel seamless tubes for chemical equipment and pipelines.

Secondly, there are regulations on the temperature resistance of seamless steel tubes. For example, the steel pipe of GB/T8163 standard is suitable for the pipeline whose design temperature is less than 350℃ and the pressure is less than 10.0MPa; while the pipeline medium is oil, oil and gas, when the design temperature exceeds 350℃ or the pressure is greater than 10.0MPa, GB9948 should be selected. Or the seamless alloy steel pipe of GB6479 standard; for pipelines operating near hydrogen, or pipelines working in an environment prone to stress corrosion, GB9948 or GB6479 standards should also be used. The GB6479 standard should be adopted for the use of cs seamless pipes at low temperatures (less than -20°C), only it specifies the requirements for the low temperature impact toughness of materials.

Generally speaking, the stainless steel plate of this kind of material has better acid resistance, and the concentration of sodium cyanide is within 70%. The temperature is 0-80°C and so on. The material of stainless steel plate 304 is one of the materials with good acid resistance, and most of the alkaline can be used in the range of 0-100°C.

In fact, the application temperature of the seamless steel tube should not be maintained between 450°C and 860°C. When the temperature of the seamless steel tube reaches 450°C, there will be a zero point. At this point, the stainless steel plate will be diluted The chromium element around the carbon element produces chromium carbide, and the chromium-depleted area appears in the area where the chromium in the diluted solution originally exists. If the chromium-depleted area appears, the characteristic material of stainless steel should be changed. In addition, the temperature of 450 ° C Additional compromising forces will transform martensite to austenite.