... .4mm, 9.2mm, 11mm, 13mm Standard: KSD 3505 PC STEEL BAR Prestressed concrete steel bar Nominal diameter in KS standard : 7.4mm, 9.2mm ... strengthRelaxation rateStraightnessElongationmmMPaMPa%%7.4Spiral groove≥1420 ≥1280 ≤2 Take the steel bar in 1meter, placed on a plane, the chord and the ... ,KS APPROVAL. ship by :20'GP container. KS approval pc steel bar