Manufacturing technology of TMCP ABS EH40 hull structure steel plate

In order to ensure the safety and reliability of the ship, the classification society has strictly stipulated the chemical composition, mechanical properties and delivery conditions of ABS EH40 hull structure steel plate.

In order to meet the high quality level ABS EH40 hull structure steel plate with low temperature toughness, high strength and excellent welding performance, the production of TMCP ABS EH40 hull structure steel plate adopt composition design of low carbon content, medium manganese content, ultra low sulfur, Nb, Ti micro alloying, control the organization of Cr alloying. At the same time, copper, nickel and other alloy elements are added to compensate strength.

The steelmaking process adopts low carbon, low sulfur, pure steel inclusion shape control smelting process to ensure the low temperature impact toughness of thick ABS EH40 hull structure steel plate. Molten molten iron is smelted through a converter and refined from the furnace, and a 300mm thick continuous casting slab is formed. TMCP technology is used to control rolling and control cooling. The two stage controlled rolling fully guarantees the deformation in the recrystallization area. After rolling, the phase transformation structure is ensured by accelerated cooling. ABS EH40 steel sheet with high strength and high temperature impact toughness was obtained by using the best combination of components and processes.

The production process of TMCP ABS EH40 hull structure steel plate is: iron water pretreatment, converter smelting, furnace refining, continuous casting, slab reheating, control rolling, control cooling, pile cooling.