Advantages and Disadvantages of Hot Rolled Seamless Pipes
Advantages of Hot Rolled Seamless Pipes
The casting structure of ingot can be destroyed. The grain of steel can be refined, and the defects of microstructure can be eliminated. Then, the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction so that the steel is no longer isotropic to a certain extent. The bubbles, cracks and porosity formed during pouring can also be welded under high temperature and pressure.
Disadvantages of Hot Rolled Seamless Pipes
1. After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, as well as silicates) in the steel are pressed into thin sheets, resulting in the delamination phenomenon. The delamination can deteriorate the tensile properties of the steel along the thickness direction, and the interlaminar tearing may occur when the weld gap shrinks. The local strain induced by weld shrinkage is often several times more than the yield point strain, which is much larger than the strain caused by load.
2. Another disadvantage is the residual stress caused by uneven cooling. The residual stress is the internal self balance stress without external force. This kind of residual stress is in all kinds of hot-rolled section steels. The larger the section size of general section steel is, the larger the residual stress is. Although the residual stress is self balanced, it has a certain influence on the performance of steel components under external force. The deformation, stability, anti fatigue and other aspects may have adverse effects.
3. The thickness and width of hot rolled steel pipes are not well controlled. We are familiar with thermal expansion and cold contraction. At the beginning of hot rolling, even if the length and thickness are up to the standards, there will be a certain negative difference after cooling. The wider the side width of the negative difference is, the thicker the thickness is. Therefore, the width, thickness, length, angle and sideline of steel can not be required to be too accurate.
The casting structure of ingot can be destroyed. The grain of steel can be refined, and the defects of microstructure can be eliminated. Then, the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction so that the steel is no longer isotropic to a certain extent. The bubbles, cracks and porosity formed during pouring can also be welded under high temperature and pressure.
Disadvantages of Hot Rolled Seamless Pipes
1. After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, as well as silicates) in the steel are pressed into thin sheets, resulting in the delamination phenomenon. The delamination can deteriorate the tensile properties of the steel along the thickness direction, and the interlaminar tearing may occur when the weld gap shrinks. The local strain induced by weld shrinkage is often several times more than the yield point strain, which is much larger than the strain caused by load.
2. Another disadvantage is the residual stress caused by uneven cooling. The residual stress is the internal self balance stress without external force. This kind of residual stress is in all kinds of hot-rolled section steels. The larger the section size of general section steel is, the larger the residual stress is. Although the residual stress is self balanced, it has a certain influence on the performance of steel components under external force. The deformation, stability, anti fatigue and other aspects may have adverse effects.
3. The thickness and width of hot rolled steel pipes are not well controlled. We are familiar with thermal expansion and cold contraction. At the beginning of hot rolling, even if the length and thickness are up to the standards, there will be a certain negative difference after cooling. The wider the side width of the negative difference is, the thicker the thickness is. Therefore, the width, thickness, length, angle and sideline of steel can not be required to be too accurate.
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