... )0.2(max)StandardGB,JIS,ASTM,DIN,AISI,BSMechanical performanceYield point≥255MPaTensile strenght 410-510MPaElongation≥24Sizecarbon steel plate/sheet:Thickness:20mm ... StateHot forged,Black&AnnealingHardnessHBS=137~269Characteristic Applicationwelding is well,Used for making normal mechinery parts,such as bolt,chain,pull rod ...