Thin steel sheet having high strength, for pressed-gas vessel and manufacturing process thereof

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PURPOSE : A high strength thin steel sheet for a compressed gas container and a manufacturing method for the same are provided to improve yield, workability and stability of the thin steel sheet by providing the thin steel sheet having a stable quality.CONSTITUTION : A manufacturing method for a high strength thin steel sheet for a compressed gas container includes the steps of performing a first cool rolling for a body part, a dome part and a bottom part. The body part is made of Al-killed coil including 0.04~0.06%% of carbon and 0.2~0.3%% of manganese. The dome part and bottom part are made of the Al-killed coil including 0.06~0.08%% of the carbon and 0.3~0.4%% of manganese, performing a continuous or batch annealing for a cool-rolled steel sheet in a temperature above a re-crystallization temperature, and performing a second cool rolling in a proper rolling rate for obtaining target yield strength.? KIPO 2008