Hydrogen Induced Cracking Susceptibility of High-Strength Line Pipe Steels

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Abstract
The effects of chemical compositions, rolling conditions, and homogenization treatment on hydrogen induced cracking (HIC) have been studied metallurgically using laboratory heats of chemical compositions corresponding to those of the center segregation zones in continuous cast slabs. The hardness of the center segregation zones in steel plates is one of the predominant factors affecting the HIC susceptibility of high-strength line pipe steels. An increase of the carbon equivalent (Ceq) or phosphorus content hardens the center segregation zones in conventional carbon steels produced by the controlled rolling (CR) process. Lowering the carbon content to the range of 0.01 to 0.05% markedly decreases the hardness of center segregation zone and reduces the HIC susceptibility, regardless of the increases in other alloy elements. Hot rolling at relatively lower temperature increases the hardness of the center segregation zone and results in a slightly high HIC susceptibility. The design of the chemical ...

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