Development direction of submarine steel

Posted:2021-06-01 11:23:09

With the development of modern metallurgical technology, submarine steel has been developed rapidly. In order to improve the toughness and weldability of submarine steel, in the alloy design, submarine steel is developing towards low carbon and ultra-low carbon. The carbon content has decreased from 0.18% to 0.06% now, which greatly improves the toughness of steel, especially the low temperature toughness; Low carbon and ultra-low carbon technologies also significantly improve the weldability of steel, basically do not preheat welding, greatly reducing the construction cost of submarine.

In smelting, submarine steel is developing towards high purity. The sulfur content in steel has decreased from 0.025% to less than 0.006%, the phosphorus content has decreased from 0.025% to less than 0.015%, the physical level of steel is lower, the harmful gas content is further reduced, and the purity of steel is higher and higher.

In the rolling process, the advanced controlled rolling and controlled cooling technology are widely used. Under the premise of the same strength, the welding carbon equivalent is significantly reduced, and the weldability of the steel is improved.

In conclusion, submarine steel is developing towards high purity, high toughness, low carbon, low carbon equivalent, low alloy content and good weldability.

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