1.size:10mm-250mm 2.grade:U2,U3,CM490,CM690 3.standard:NK,DNV,LR,ABS,CCS 4.stable quality and best ... five QC to keep the products good quality so that in overseas marketing,we have been getting good reputation for 10 ... steel for marine use1.size:11mm-250mm.2.grade:CM490, CM690, 20MnCrNiMo.3.standard:NK,DNV,LR,ABS,CCS.If you have ...