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ANSWER: JIS G 3135 SPFC540Y steel is cold rolled or cold reduced high strength steel sheet or steel strip with improved formability for automobile use.
JIS G 3135 is Japanese industrial standard specifications the cold rolled high strength steel sheets with improved formability principally used for structure of automobile.
SPFC540Y also called SPFC35 whose applied thickness is 0.6 and over to 2.3 mm . SPFC540Y is a low yield ratio type quality use steel material The carbon composition of all the above grades is max 0.12%.
The yield strength of SPFC540Y is min 245MPa, tensile strength is min 540YMPa, Elongation is min 21%
