1. The applicable temperature range for flanges made of different materials varies
Carbon steel flange
For a 150lb flange made of carbon steel material, the minimum operating temperature can generally reach around -29 ℃. At low temperatures, the toughness of carbon steel decreases and brittle fracture may occur. Its maximum operating temperature is usually around 427 ℃. When the temperature is too high, the strength of carbon steel will significantly decrease, and oxidation and other phenomena will occur, affecting the performance and service life of the flange.
Alloy steel flange
The specific applicable temperature range varies depending on the alloy composition. The maximum operating temperature of some low-alloy steel flanges can reach around 593 ℃, and the minimum temperature can reach around -46 ℃. The addition of alloying elements improves the high-temperature strength and low-temperature toughness of steel, enabling it to adapt to more complex temperature environments.
Stainless steel flange
304 stainless steel 150lb flange, with a minimum operating temperature of -196 ℃, allows it to be used normally in some low-temperature liquid (such as liquid nitrogen) transportation pipeline systems. Its maximum operating temperature is approximately 816 ℃. Stainless steel has good oxidation and corrosion resistance at high temperatures, and can maintain good strength and toughness over a wide temperature range.
2. Affected by factors such as the medium
Even for flanges with the same pressure rating and material, the applicable temperature range may vary in different media environments. For example, in highly corrosive media, the temperature resistance of flanges may decrease. Because corrosion may accelerate the aging and damage of materials, causing problems such as leakage of flanges at temperatures that they could otherwise withstand. At the same time, pressure fluctuations in the medium can also affect the actual applicable temperature range of the flange. If the pressure changes frequently, the stress borne by the flange will become more complex at higher or lower temperatures, which may lower its safe operating temperature range.
