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Steel pipe surface temperature coefficient
Sources: this site Click: Date: 2016-4-8 1:45:32
Uneven cooling pipe segments between the secondary cooling zone. Steel pipe surface temperature cyclical recovery. Excessive rise pipe surface temperature will cause expansion of shell, steel solidification front of the occurrence of an excessive tensile stress. When the stress beyond steel and high-temperature strength to allow the critical strain occurs between the outer pipe and the center of internal cracks. Pipe close completely solidified, the temperature rise is too large center segregation and center cracks occur. The temperature rise of the outer pipe is generally controlled at 100 ~ Cm or less. Tube Straightening brittle deformation zone limit criteria of each high temperature mechanical properties of different types of steel, there is a corresponding thermoplastic curve. The thermoplastic pipe curve from the continuous casting process liquidus temperature TL to pipe temperature 600cI two into three temperature zones, a first zone of ductile-brittle transition temperature region, the liquidus temperature TL1200 ℃; second temperature zone of austenite body region, 1200900 ℃, generally the best plastic zone; the third temperature zone of low plasticity zone, 900600 ℃, the lowest steel ductility pocket area. The area has plastic lowest value is closely related to the appearance of a crack pipe. Steel pipe surface temperature straightening zone should avoid low-temperature ductility zone, so when straightening steel outer transverse cracking occurred. Measures usually taken to adjust the secondary cooling system, straightening the steel pipe at a temperature higher than the low point of the plastic third temperature zone, adhere to more than 900 ℃. Steel pipe surface temperature range shaken smaller the better adhere to the same, on the whole should be guaranteed in the range 8501150 ℃.
