... .2.Good internal quality:Flaw detection to meet the grade I standard JB/T4730,GB/T2970 and SEL072, EN10160 standard S3T4 ... , P355NH, P355NL1, P355NL2P355NL2, A516Gr55(60,65,70)A299A517GrQ(A,B,E,F, H , P,S,)EN10028-3:2003ASTM A516/A516M-06ASTM A299 ... .2.Good internal quality:Flaw detection to meet the grade I standard JB/T4730,GB72790 ASTM,A435, A578, JISG0801, JISG0901, sel072 ...