DNV (Det Norske Veritas) yog ib lub koom haum kev faib tawm uas tsim cov qauv rau kev lag luam maritime, suav nrog kev tsim khoom hauv nkoj thiab sab nrauv.DNV tau lees paub cov ntaub ntawv siv hauv cov kev lag luam no tiv thaiv cov txheej txheem tshwj xeeb los xyuas kom muaj kev nyab xeeb, zoo thiab kev ntseeg siab.Qee yam ntawm cov qib steel uas tau lees paub los ntawm DNV muaj xws li:
DNV Qib A: Qhov no yog qib steel feem ntau siv rau kev siv lub tsev thiab nkoj siv.
DNV D qib: Feem ntau siv rau hauv kev tsim cov nkoj hull cov qauv.
DNV Qib E: Siv rau kev tsim cov nkoj decks thiab bulkheads.
DNV AH32, DH32, EH32, FH32: Cov qib no yog categorized li high-strength steels thiab siv nyob rau hauv kev tsim kho ntawm offshore platforms.
DNV AH36, DH36, EH36, FH36: siab zog shipbuilding steels rau kev tsim cov nkoj thiab cov khoom siv marine.
DNV AH40, DH40, EH40, FH40: qib high-strength rau cov qauv offshore thiab shipbuilding.
DNV NV A32, NV D32, NV E32, NV F32: Cov khoom siv rau kev tsim cov nkoj, nkoj thiab cov khoom siv hauv hiav txwv.
DNV NV A36, NV D36, NV E36, NV F36: qib tsim los rau kev siv lub zog muaj zog hauv kev lag luam marine.
