The Classification and Characteristic of Seamless Steel Pipe

Posted by zora li on September 13th, 2022

The classification of seamless steel pipe is hot rolled and cold drawn seamless steel pipe.

Disadvantages of seamless steel pipe: 

1. After this hot rolling, the steel inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Hierarchical position of the steel in the thickness tensile performance deteriorated significantly, and there can be positive which is torn between layers of weld shrinkage occurs. Weld heavily strain-induced contraction of the yield point strain often arrive several times larger than the load-induced strain; 
2. uneven cooling constitute surplus stress. Stress is stress positive surplus is no external force equilibrium of internal self-rolled steel sections have such a surplus of various stress, the greater the deformity steel sectional dimensions, the greater the stress surplus. Although earnings from stress equilibrium, but the performance on the steel members are now under external force or a certain response. About change shape as seamless pipes, stability, anti-fatigue and other areas can attack a useful role. 
3. hot-rolled steel products, for the thickness and width of a bad side to dominate this area. We are familiar with thermal expansion and contraction, due to the end of the hot rolling out even when the length and thickness are standard, and finally cooled or there will be some negative difference, this negative difference edge width wider, thicker the more obvious manifestations. Because the steel in large, for in the steel edge width, thickness, length, angle, and no law requires very precise edges. 

Advantages of seamless steel pipe: 
It can damage tissue ingot casting, grain refinement of steel, the microstructure and eliminate the defect, so that the steel dense tissue, the mechanical properties deteriorate. This deterioration is mainly reflected precisely along the rolling position, so that a certain degree of steel are no longer being isotropic; pouring forming bubbles, cracks and loose, also under high temperature and pressure are being welded together. 

Read more : seamless carbon steel pipe