normalized CCS E36 marine vessel steel plate surface cracks refer to the linear cracks on the surface of normalized CCS E36 marine vessel steel plate, which should generally be the same as the forging or rolling direction. Formation reason: it is mainly due to the hairline, hot crack and cold crack caused by surface over burning, decarburization, looseness, deformation and excessive internal stress during processing (forging, rolling, heat treatment, quenching and tempering), as well as the high content of sulfur and phosphorus impurities on the surface. Inspection method: normalized CCS E36 marine vessel steel plate surface cracks can be detected by naked eye observation, acid pickling, magnetic particle inspection, coloring inspection and metallographic method.
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Normalizing is to heat the steel parts to 30~80℃above the critical temperature for a period of time. Then the parts are taken out of the furnace and cooled in air. Since the cooling rate of normalizing is faster than that of annealing, the strength and hardness of normalized normalized CCS E36 marine vessel steel plate are higher than that of annealed normalized CCS E36 marine vessel steel plate, but the elimination of internal stress is not as good as annealing. The normalizing operation of normalized CCS E36 marine vessel steel plate is simple, the cost is low, the productivity is high, and it is widely used in actual production.
The yield strength of A36, D36, E36 and F36 is not less than 355N/mm^2, and the normalized CCS E36 marine vessel steel plate tensile strength is 490~620N/mm^2. A, D, E and F respectively indicate that they can be at 0° and -20 ° respectively. Impact toughness that can be achieved at -40℃, -60 ℃.
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