LPG Tank Heat Treatment for Stress Relief
In the manufacturing process of LPG tanks, due to frequent rolling and correction, the interior of the workpiece is constantly subjected to tension and pressure, resulting in uneven stress and stress concentration.
LPG storage tanks cause changes in the structure and properties of the weld zone during welding, resulting in residual stress in the weld zone of the workpiece. Some LPG storage tanks have hydrogen entering the steel body during the blank forging. When the hydrogen is gradually dissolved in the metal, the strength and plasticity of the steel will be significantly reduced, causing hydrogen embrittlement of the workpiece.
In order to eliminate these effects on the performance of LPG tanks, the usual method is after-welding heat treatment.
LPG storage tank post-weld heat treatment generally refers to stress relief annealing. It is to improve the performance of the welding zone and eliminate harmful effects such as welding residual stress. To uniformly and fully heat the weld zone and related parts below the metal phase transition temperature.
Then the process of uniform cooling. In many cases, the post-weld heat treatment discussed is essentially a post-weld stress relief heat treatment.
The benefits of post-weld heat treatment for LPG tanks are:
1. Relax the welding residual stress of the LPG tank.
2. Stabilize the shape and size of the LPG tank structure and reduce distortion.
3. Improve the performance of the base material and weld zone of LPG tanks, including increasing the plasticity of the weld metal, reducing the hardness of the heat-affected zone, improving the impact toughness, improving the fatigue strength, recovering or increasing the yield strength reduced during cold forming.
4. Improve the ability of LPG tanks to resist stress corrosion.
5. Further release the harmful gases in the weld metal, especially hydrogen, to prevent the occurrence of delayed cracks.
Heat Treatment Report for LPG Tank
After All Tank WeldingFinished
620 ℃ Heating Last in 40 Minutes
Nutual Cooling in room Temperature
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Heat Treatment Oven
Heat Treatment Finished Tank
