When the steel plant approves, if the EH36 grade high strength ship plate steel is proposed to the classification society in advance and reported in the ladle analysis, other alloy elements of FH36 marine plate and beyond the normal alloy element content range can also be accepted.
(1) For FH36 marine plate with thickness less than 12.5mm, the Mn content can be as low as 0.70%.
(2) In FH36 marine plate, the total aluminum content can replace the acid soluble aluminum content, and the total aluminum content should not be less than 0.020%.
(3) FH36 marine plate should contain aluminum, niobium, vanadium and other refined grain elements, which can be one or any combination. When only one of them is used, FH36 marine plate should contain the specified low content grain refinement elements. When several elements are used together, the content of at least one element in FH36 marine plate shall not be lower than the specified value; the total content of niobium, vanadium and titanium shall not exceed 0.12%.
(4) The chemical composition fluctuation of FH36 marine plate delivered in thermo mechanical controlled rolling state is allowed to be regulated with the approval of classification society and the name is given in advance in the approval procedure.
