Carbon Structure Steel Bar Grade:1008-1572 series by ASTM,St12,13,14 Ck10- ... professional of supplying carbon structure steel cold draw and extruded bar and rod by standard GB/T799,ASTM A29,A108,A321 ... ,15Mn3,21Mn4,30Mn4,36Mn4,40Mn4By BS:040A10,12,040A12,080A15,20,070M26,080M30,36,40,46,50,070M35,60,080A67,72 ... ,78,81,080A15,20,080M30,40,47,50By JIS:SPHD3.Size: Dia 1-400mm ...