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SOCIETYSTANDARD OR USAGESTEEL GRADECHEMICAL COMPOSITION, %(C)GLRNon allolyGL-R 410≤ 0.21GLRGB 1824837Mn0.34 ~0.40GLREN 1029734CrMo40.30 ~0.37DNVfor pressure ASTM A53/A53MA53B≤ 0.30See all 21 rows on sunnysteel