The factors that affect the properties of steel are: chemical composition, melting and casting, rolling and heat treatment processes, etc..Among mainly chemical composition, the content of sulfur and phosphorus directly affects the properties of the steel plate in the thickness direction. Sulfur is the element with the most serious segregation in the continuous casting slab. Sulfur will cause hot embrittlement of steel, which will cause cracks in steel during high temperature forging. A lot of porosity and pores are generated during welding.
Phosphorus is second only to sulfur in the continuous casting billet of steel with the highest segregation degree, and the diffusion rate of phosphorus in iron solid solution is very small, so the segregation of phosphorus is difficult to eliminate, which seriously affects the performance of steel. Phosphorus is dissolved in ferrite in the form of solid solution. This solid solution is very brittle, and the formed phosphorus-rich zone makes the steel brittle and reduces the plasticity, toughness and weldability of the steel. It is easy to cause cracking of steel during hot working, and cracks are easily generated during welding. Phosphorus is an element that reduces the surface tension of steel. With the increase of phosphorus content, the surface tension of molten steel decreases significantly, thereby reducing the crack resistance of steel.
Therefore, Offshore platform steel plates have strict requirements on the content of sulfur and phosphorus, among which the content of sulfur is strictly controlled.
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