Specific reasons for cracking of cold drawn seamless steel pipes
When the steel pipe is cold drawn, it will also produce a lot of plastic deformation, which will cause obvious lattice distortion, so that the lattice energy can be increased, and the internal energy of the metal will also increase, causing the internal stress of the metal to be uneven, and there will be internal stress. The hardness of the metal will increase and the toughness will decrease. As the metal hardness becomes higher, the residual internal stress will increase during cold drawing, and work hardening will become obvious. After the residual stress reaches a certain value, the metal will tear along the grain interface, and eventually the cold-drawn seamless steel pipe will crack.
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Affected by hydrogen embrittlement conditions
When acid is used to remove scale, sulfuric acid reacts with iron and hydrogen gas is released. Hydrogen penetrates into the steel in the form of atoms or ions, and eventually forms a solid solution. When hydrogen also affects the mechanical properties of steel, the most typical manifestation is hydrogen embrittlement. It will naturally occur on cold-drawn seamless steel pipes, so you need to pay more attention when using it.