What is the difference between q345 and ccs grade B steel plate? Can it be used as ccs ship plate? In theory, it is not possible, because CCS needs to be certified by the classification society before it can be used on ships, and Q345B steel is alow-alloy structural steel. Although some steel grades in A387 GR.5 CL.1 pressure vessel steel sheet have the same performance as Q345B, they are resistant to corrosion. There is still a gap in key performance.
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Hydrogen (H) is the most harmful element in general steel such as A387 GR.5 CL.1 pressure vessel steel sheet. Hydrogen dissolved in steel will cause hydrogen embrittlement, white spots and other defects. Hydrogen, like oxygen and nitrogen, has very little solubility in solid steel. It dissolves into liquid steel at high temperature, and accumulates in the structure without time to escape when cooling, forming high-pressure micro pores, which greatly reduce the plasticity, toughness and fatigue strength of steel, and even cause cracks and brittle fracture in severe cases. "Hydrogen embrittlement" mainly occurs in martensitic steel, but not very prominent in ferrite steel, and generally increases with hardness and carbon content.
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