The present invention provides a steel cord for rubber reinforcement. The steel cord comprises a core strand and at least three outer strands twisted around the core strand, the core strand comprising at least one first core filament and a plurality of first outer filaments twisted around the first core filament, each The outer strand comprises a plurality of second filaments, at least one of the plurality of first outer filaments is preformed prior to twisting into a core strand, and at least one of the second steel filaments is straight before twisting to form each outer strand. to be. The steel cord has improved performance with regard to core filament separation.
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