The influences of normalizing temperature on the microstructure and mechanical properties of high frequency electric resistance welded pipe X52 were studied by Gleeble-3500 thermo mechanical simulator. The results show that the strength of X52 steel deceases with the increase of normalizing temperature in the normalizing temperature range from 850 to 1000 ℃, when the normalizing temperature is 900 ℃, the lowest strength is obtained. With further increasing the normalizing temperature, the strength increases. However, with the increase of the normalizing temperature in range from 900 to 1000 ℃, the microstructure of the weld zone is refined, and the strength increases. Under the same heat treatment conditions, the microstructure and mechanical properties of the weld zone are similar to that of steel plate.
high frequency electric resistance weldedX52 steelnormalizing temperatureproperty
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