The steel standard called "yield", are measured in Pascal, ordinary civilian was only 250Mpa. Ordinary warships are also required around 300Mpa. And usually a fixed wing aircraft carrier will be around 700Mpa.
The Soviet special steel is the most yielding special steel in the world (because the Soviet submarines require higher than the aircraft carrier). The highest can exceed 1000Mpa, only used on submarines, by the Soviet government as a strategic material, not allowed to export without authorization.
The US aircraft carrier mainly uses the HY series, the yield strength of HY-80 is 550Mpa, HY-100 is 690Mpa, HY-130 is 890 Mpa, and it is not allowed to export without the US government authorization as strategic material.
France can only make steel with a yield of 550Mpa, since France does not restrict the export of such steel, so the best steel can be bought on the market. Britain can't make it itself, buys from France.
The French "De Gaulle" aircraft carrier imported American special steel.
Elizabeth, the British aircraft carrier, broke a bearing during the sea trial this year, and the problem came out of the material.
Chinese military steel has 590Mpa 921 steel and 785 Mpa 980 super steel, the former is HY80 grade, and the latter is HY100 level. chinese aircraft carrier use another kind of steel which is better than 980 super steel. it is confident , no one know the exact information
The top steel in the United States, China, Russia, usally can not be bought
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