... -Q275,40Cr,20-42CrMo,20-30CrMnTi carbon steel round bars,high quality round bars2.10#,20#,25#,30#,35#, ... .2(max)0.2(max)StandardGB,JIS,ASTM,DIN,AISI,BSMechanical performanceYield point≥255MPaTensile strenght 410-510MPaElongation≥24Sizecarbon steel ... inspection institution:CIQ,SGS,ITS,BV,etc)Delivery StateHot forged,Black&AnnealingHardnessHBS=137~269Characteristic Applicationwelding is well,Used for ...